diff --git a/attributs.py b/attributs.py
index 32bbc8b..502f774 100644
--- a/attributs.py
+++ b/attributs.py
@@ -196,6 +196,7 @@ class AttrsList(list):
         self._commit()
 
 class AttrsDict(dict):
+    __slots__ = ("_conn", "_parent", "_iterator")
     def __init__(self, conn, uldif={}, Parent=None):
         super(AttrsDict, self).__init__(uldif)
         self._conn = conn
@@ -250,10 +251,10 @@ class Attr(object):
     * ``val``        : valeur de l'attribut
     * ``ldif``       : objet contenant l'attribut (permet de faire les validations sur l'environnement)
     """
+    __slots__ = ("value", "conn", "parent")
     legend = "Human-readable description of attribute"
     singlevalue = False
     optional = True
-    conn = None
     unique = False
     concurrent = True
     historique = "full" # valeurs possibles "full", "partial", "info", None
@@ -386,6 +387,7 @@ def crans_attribute(classe):
 
 @crans_attribute
 class objectClass(Attr):
+    __slots__ = ()
     singlevalue = False
     optional = False
     legend = "entité"
@@ -408,7 +410,7 @@ class objectClass(Attr):
 
 
 class intAttr(Attr):
-
+    __slots__ = ()
     python_type = int
 
     def __add__(self, obj):
@@ -432,7 +434,7 @@ class intAttr(Attr):
         return unicode(self.value)
 
 class floatAttr(Attr):
-
+    __slots__ = ()
     python_type = float
 
     def __add__(self, obj):
@@ -454,7 +456,7 @@ class floatAttr(Attr):
         return unicode(self.value)
 
 class boolAttr(Attr):
-
+    __slots__ = ()
     python_type = bool
 
     def parse_value(self, val):
@@ -472,6 +474,7 @@ class boolAttr(Attr):
 
 @crans_attribute
 class aid(intAttr):
+    __slots__ = ()
     singlevalue = True
     optional = True
     legend = u"Identifiant de l'adhérent"
@@ -489,6 +492,7 @@ class aid(intAttr):
 
 @crans_attribute
 class uid(Attr):
+    __slots__ = ()
     singlevalue = True
     option = False
     legend = u"L'identifiant canonique de l'adhérent"
@@ -499,6 +503,7 @@ class uid(Attr):
 
 @crans_attribute
 class preferedLanguage(Attr):
+    __slots__ = ()
     singlevalue = True
     option = True
     legend = u"La langue préférée de l'adhérent"
@@ -508,6 +513,7 @@ class preferedLanguage(Attr):
 
 @crans_attribute
 class nom(Attr):
+    __slots__ = ()
     singlevalue = True
     optional = False
     legend = "Nom"
@@ -526,6 +532,7 @@ class nom(Attr):
 
 @crans_attribute
 class prenom(Attr):
+    __slots__ = ()
     singlevalue = True
     optional = False
     legend = u"Prénom"
@@ -538,6 +545,7 @@ class prenom(Attr):
 
 @crans_attribute
 class compteWiki(Attr):
+    __slots__ = ()
     singlevalue = False
     optional = True
     legend = u"Compte WiKi"
@@ -551,6 +559,7 @@ class compteWiki(Attr):
 
 @crans_attribute
 class tel(Attr):
+    __slots__ = ()
     singlevalue = True
     optional = False
     legend = u"Téléphone"
@@ -564,6 +573,7 @@ class tel(Attr):
             raise ValueError("Numéro de téléphone invalide (%r)" % tel)
 
 class yearAttr(intAttr):
+    __slots__ = ()
     singlevalue = False
     optional = True
 
@@ -575,6 +585,7 @@ class yearAttr(intAttr):
 
 @crans_attribute
 class paiement(yearAttr):
+    __slots__ = ()
     legend = u"Paiement"
     can_modify = [cableur, nounou, tresorier]
     category = 'perso'
@@ -582,6 +593,7 @@ class paiement(yearAttr):
 
 @crans_attribute
 class carteEtudiant(Attr):
+    __slots__ = ()
     legend = u"Carte d'étudiant"
     category = 'perso'
     can_modify = [cableur, nounou, tresorier]
@@ -592,6 +604,7 @@ class carteEtudiant(Attr):
 
 @crans_attribute
 class derniereConnexion(intAttr):
+    __slots__ = ()
     legend = u"Dernière connexion"
     can_modify = [nounou, cableur, soi] # il faut bien pouvoir le modifier pour le mettre à jour
     ldap_name = "derniereConnexion"
@@ -601,6 +614,7 @@ class generalizedTimeFormat(Attr):
     une donnée de temps suivant la RFC 4517
 
     """
+    __slots__ = ("_stamp",)
     default = "19700101000000Z"
 
     def __float__(self):
@@ -649,6 +663,7 @@ class generalizedTimeFormat(Attr):
 
 @crans_attribute
 class debutAdhesion(generalizedTimeFormat):
+    __slots__ = ()
     legend = u"Date de début de l'adhésion"
     category = 'Adh'
     can_modify = [cableur, nounou]
@@ -657,6 +672,7 @@ class debutAdhesion(generalizedTimeFormat):
 
 @crans_attribute
 class finAdhesion(generalizedTimeFormat):
+    __slots__ = ()
     legend = u"Date de fin de l'adhésion"
     category = 'Adh'
     can_modify = [cableur, nounou]
@@ -664,6 +680,7 @@ class finAdhesion(generalizedTimeFormat):
 
 @crans_attribute
 class debutConnexion(generalizedTimeFormat):
+    __slots__ = ()
     legend = u"Date de début de la connexion"
     category = 'Adh'
     can_modify = [cableur, nounou]
@@ -671,6 +688,7 @@ class debutConnexion(generalizedTimeFormat):
 
 @crans_attribute
 class finConnexion(generalizedTimeFormat):
+    __slots__ = ()
     legend = u"Date de fin de la connexion"
     category = 'Adh'
     can_modify = [cableur, nounou]
@@ -678,6 +696,7 @@ class finConnexion(generalizedTimeFormat):
 
 @crans_attribute
 class mail(Attr):
+    __slots__ = ()
     singlevalue = False
     optional = False
     unique = True
@@ -733,6 +752,7 @@ class mail(Attr):
 
 @crans_attribute
 class canonicalAlias(mail):
+    __slots__ = ()
     singlevalue = True
     optional = True
     unique = True
@@ -747,6 +767,7 @@ class canonicalAlias(mail):
 
 @crans_attribute
 class mailAlias(mail):
+    __slots__ = ()
     singlevalue = False
     optional = True
     unique = True
@@ -757,6 +778,7 @@ class mailAlias(mail):
 
 @crans_attribute
 class mailExt(mail):
+    __slots__ = ()
     singlevalue = False
     optional = True
     unique = True
@@ -774,6 +796,7 @@ class mailExt(mail):
 
 @crans_attribute
 class mailInvalide(boolAttr):
+    __slots__ = ()
     optional = True
     legend = u"Mail invalide"
     can_modify = [bureau, nounou]
@@ -781,6 +804,7 @@ class mailInvalide(boolAttr):
 
 @crans_attribute
 class contourneGreylist(boolAttr):
+    __slots__ = ()
     optionnal = True
     legend = u"Contourner la greylist"
     category = 'mail'
@@ -792,6 +816,7 @@ class contourneGreylist(boolAttr):
 
 @crans_attribute
 class etudes(Attr):
+    __slots__ = ()
     singlevalue = False
     optional = True
     legend = u"Études"
@@ -801,6 +826,7 @@ class etudes(Attr):
 
 @crans_attribute
 class chbre(Attr):
+    __slots__ = ()
     singlevalue = True
     optional = False
     unique = True
@@ -824,6 +850,7 @@ class chbre(Attr):
 
 @crans_attribute
 class droits(Attr):
+    __slots__ = ()
     singlevalue = False
     optional = True
     legend = u"Droits sur les serveurs"
@@ -851,6 +878,7 @@ class droits(Attr):
 
 @crans_attribute
 class solde(floatAttr):
+    __slots__ = ()
     python_type = float
     singlevalue = True
     concurrent = False
@@ -869,6 +897,7 @@ class solde(floatAttr):
         return u"%.2f" % self.value
 
 class dnsAttr(Attr):
+    __slots__ = ()
     category = 'dns'
     ldap_name = "dnsAttr"
     python_type = unicode
@@ -883,6 +912,7 @@ class dnsAttr(Attr):
 
 @crans_attribute
 class host(dnsAttr):
+    __slots__ = ()
     singlevalue = True
     unique = True
     optional = False
@@ -902,6 +932,7 @@ class host(dnsAttr):
 
 @crans_attribute
 class hostAlias(host):
+    __slots__ = ()
     singlevalue = False
     unique = True
     optional = True
@@ -911,6 +942,7 @@ class hostAlias(host):
 
 @crans_attribute
 class macAddress(Attr):
+    __slots__ = ()
     singlevalue = True
     optional = False
     legend = u"Adresse physique de la carte réseau"
@@ -933,6 +965,7 @@ class macAddress(Attr):
 
 @crans_attribute
 class ipHostNumber(Attr):
+    __slots__ = ()
     singlevalue = True
     optional = True
     unique = True
@@ -954,6 +987,7 @@ class ipHostNumber(Attr):
 
 @crans_attribute
 class ip6HostNumber(Attr):
+    __slots__ = ()
     singlevalue = True
     optional = True
     unique = True
@@ -977,6 +1011,7 @@ class ip6HostNumber(Attr):
 
 @crans_attribute
 class mid(intAttr):
+    __slots__ = ()
     singlevalue = True
     optional = False
     unique = True
@@ -986,6 +1021,7 @@ class mid(intAttr):
 
 @crans_attribute
 class rid(intAttr):
+    __slots__ = ()
     singlevalue = True
     optional = True
     unique = True
@@ -1017,6 +1053,7 @@ class rid(intAttr):
 
 @crans_attribute
 class ipsec(Attr):
+    __slots__ = ()
     singlevalue = False
     optional = True
     legend = u'Clef wifi'
@@ -1036,6 +1073,7 @@ class ipsec(Attr):
 
 @crans_attribute
 class puissance(Attr):
+    __slots__ = ()
     singlevalue = True
     optional = True
     legend = u"puissance d'émission pour les bornes wifi"
@@ -1045,6 +1083,7 @@ class puissance(Attr):
 
 @crans_attribute
 class canal(intAttr):
+    __slots__ = ()
     singlevalue = True
     optional = True
     legend = u'Canal d\'émission de la borne'
@@ -1054,6 +1093,7 @@ class canal(intAttr):
 
 @crans_attribute
 class hotspot(boolAttr):
+    __slots__ = ()
     singlevalue = True
     optional = True
     legend = u'Hotspot'
@@ -1063,6 +1103,7 @@ class hotspot(boolAttr):
 
 @crans_attribute
 class positionBorne(Attr):
+    __slots__ = ()
     legend = u"Position de la borne"
     category = "wifi"
     can_modify = [nounou]
@@ -1072,12 +1113,14 @@ class positionBorne(Attr):
 
 @crans_attribute
 class nvram(Attr):
+    __slots__ = ()
     legend = u"Configuration speciale"
     optional = True
     can_modify = [nounou]
     ldap_name = "nvram"
 
 class portAttr(Attr):
+    __slots__ = ()
     singlevalue = False
     optional = True
     legend = u'Ouverture de port'
@@ -1114,26 +1157,31 @@ class portAttr(Attr):
 
 @crans_attribute
 class portTCPout(portAttr):
+    __slots__ = ()
     legend = u"Port TCP ouvert vers l'extérieur"
     ldap_name = "portTCPout"
 
 @crans_attribute
 class portTCPin(portAttr):
+    __slots__ = ()
     legend = u"Port TCP ouvert depuis l'extérieur"
     ldap_name = "portTCPin"
 
 @crans_attribute
 class portUDPout(portAttr):
+    __slots__ = ()
     legend = u"Port UDP ouvert vers l'extérieur"
     ldap_name = "portUDPout"
 
 @crans_attribute
 class portUDPin(portAttr):
+    __slots__ = ()
     legend = u"Port UDP ouvert depuis l'extérieur"
     ldap_name = "portUDPin"
 
 @crans_attribute
 class exempt(Attr):
+    __slots__ = ()
     legend = u"Exemption vers une IP"
     ldap_name = "exempt"
     python_type = netaddr.IPNetwork
@@ -1147,6 +1195,7 @@ class exempt(Attr):
 
 @crans_attribute
 class nombrePrises(intAttr):
+    __slots__ = ()
     legend = u"Nombre de prises ethernet de la machine"
     singlevalue = True
     optional = True
@@ -1156,6 +1205,7 @@ class nombrePrises(intAttr):
 
 @crans_attribute
 class prise(Attr):
+    __slots__ = ()
     singlevalue = True
     optional = True
     legend = u"Prise sur laquelle est branchée la machine"
@@ -1165,6 +1215,7 @@ class prise(Attr):
 
 @crans_attribute
 class cid(intAttr):
+    __slots__ = ()
     singlevalue = True
     optional = True
     unique = True
@@ -1177,6 +1228,7 @@ class cid(intAttr):
 
 @crans_attribute
 class responsable(Attr):
+    __slots__ = ('__value', '_value')
     singlevalue = True
     optional = True
     legend = u"Responsable du club"
@@ -1222,6 +1274,7 @@ class responsable(Attr):
 
 @crans_attribute
 class imprimeurClub(Attr):
+    __slots__ = ("__value", "_value")
     optional = True
     legend = u"Imprimeur du club"
     category = "perso"
@@ -1262,6 +1315,7 @@ class imprimeurClub(Attr):
 
 @crans_attribute
 class blacklist(Attr):
+    __slots__ = ()
     singlevalue = False
     optional = True
     legend = u"Blackliste"
@@ -1314,7 +1368,7 @@ class blacklist(Attr):
 @crans_attribute
 class historique(Attr):
     """Un historique est usuellement de la forme JJ/MM/AAAA HH:mm:ss, action comm"""
-
+    __slots__ = ()
     singlevalue = False
     concurrent = False
     optional = True
@@ -1339,6 +1393,7 @@ class historique(Attr):
 
 @crans_attribute
 class info(Attr):
+    __slots__ = ()
     singlevalue = False
     optional = True
     legend = u"Quelques informations"
@@ -1349,6 +1404,7 @@ class info(Attr):
 
 @crans_attribute
 class homepageAlias(Attr):
+    __slots__ = ()
     singlevalue = True
     optional = True
     legend = u'Un alias pour la page personnelle'
@@ -1358,6 +1414,7 @@ class homepageAlias(Attr):
 
 @crans_attribute
 class charteMA(boolAttr):
+    __slots__ = ()
     singlevalue = True
     optional = True
     legend= "Signale si l'adhérent a signé la charte de membres actifs"
@@ -1367,6 +1424,7 @@ class charteMA(boolAttr):
 
 @crans_attribute
 class homeDirectory(Attr):
+    __slots__ = ()
     singlevalue=True
     optional = True
     unique = True
@@ -1392,6 +1450,7 @@ class homeDirectory(Attr):
 
 @crans_attribute
 class loginShell(Attr):
+    __slots__ = ()
     singlevalue = True
     optional = True
     legend = "Le shell de l'adherent"
@@ -1408,6 +1467,7 @@ class loginShell(Attr):
 
 @crans_attribute
 class uidNumber(intAttr):
+    __slots__ = ()
     singlevalue = True
     optional = True
     unique = True
@@ -1417,6 +1477,7 @@ class uidNumber(intAttr):
 
 @crans_attribute
 class gidNumber(intAttr):
+    __slots__ = ()
     singlevalue = True
     optional = True
     legend = "Le gid du compte de l'adhérent"
@@ -1425,6 +1486,7 @@ class gidNumber(intAttr):
 
 @crans_attribute
 class gecos(Attr):
+    __slots__ = ()
     singlevalue = True
     optional = True
     legend = "Le gecos"
@@ -1433,6 +1495,7 @@ class gecos(Attr):
 
 @crans_attribute
 class userPassword(Attr):
+    __slots__ = ()
     singlevalue = True
     optional = True
     legend = "Le mot de passe"
@@ -1459,6 +1522,7 @@ class userPassword(Attr):
 
 @crans_attribute
 class sshFingerprint(Attr):
+    __slots__ = ()
     singlevalue = False
     optional = True
     legend = "Clef ssh de la machine"
@@ -1506,6 +1570,7 @@ class sshFingerprint(Attr):
 
 @crans_attribute
 class gpgFingerprint(Attr):
+    __slots__ = ()
     singlevalue = False
     optional = True
     unique = True
@@ -1517,6 +1582,7 @@ class gpgFingerprint(Attr):
 class gpgMail(mail):
     """Attribut servant à stocker un mail allant de paire avec
     l'un des uid dans la clef gpg pointée par gpgFingerprint"""
+    __slots__ = ()
     singlevalue = False
     optional = True
     unique = True
@@ -1532,6 +1598,7 @@ class gpgMail(mail):
 
 @crans_attribute
 class cn(Attr):
+    __slots__ = ()
     singlevalue = True
     optional = False
     category = 'id'
@@ -1539,6 +1606,7 @@ class cn(Attr):
 
 @crans_attribute
 class dn(Attr):
+    __slots__ = ()
     singlevalue = True
     optional = False
     unique = True
@@ -1547,6 +1615,7 @@ class dn(Attr):
 
 @crans_attribute
 class postalAddress(Attr):
+    __slots__ = ()
     singlevalue = False
     optional = True
     can_modify = [soi, cableur, nounou, bureau]
@@ -1556,6 +1625,7 @@ class postalAddress(Attr):
 
 @crans_attribute
 class controle(Attr):
+    __slots__ = ()
     singlevalue = True
     optional = True
     legend = u"Contrôle"
@@ -1570,6 +1640,7 @@ class controle(Attr):
 
 @crans_attribute
 class fid(intAttr):
+    __slots__ = ()
     legend = u"Id de facture"
     category = 'factures'
     optional = False
@@ -1578,6 +1649,7 @@ class fid(intAttr):
 
 @crans_attribute
 class modePaiement(Attr):
+    __slots__ = ()
     legend = u"Mode de paiement"
     category = 'factures'
     optional = False
@@ -1592,11 +1664,13 @@ class modePaiement(Attr):
 
 @crans_attribute
 class recuPaiement(Attr):
+    __slots__ = ()
     ldap_name = "recuPaiement"
     can_modify = [cableur, nounou]
 
 @crans_attribute
 class article(Attr):
+    __slots__ = ()
     singlevalue = False
     optional = True
     legend = u"Articles"
@@ -1640,26 +1714,31 @@ class article(Attr):
 
 @crans_attribute
 class dnsIpv6(boolAttr):
+    __slots__ = ()
     ldap_name = "dnsIpv6"
     legend = "Détermine si l'ipv6 apparait dans le dns"
     can_modify = [nounou, parent, cableur]
 
 @crans_attribute
 class rewriteMailHeaders(boolAttr):
+    __slots__ = ()
     ldap_name = "rewriteMailHeaders"
 
 @crans_attribute
 class machineAlias(boolAttr):
+    __slots__ = ()
     ldap_name = "machineAlias"
 
 @crans_attribute
 class issuerCN(Attr):
+    __slots__ = ()
     ldap_name = "issuerCN"
     can_modify = [nounou]
     legend = "Common Name de l'éméteur du certificat"
 
 @crans_attribute
 class serialNumber(Attr):
+    __slots__ = ()
     ldap_name = "serialNumber"
     python_type = int
     can_modify = [nounou]
@@ -1667,18 +1746,21 @@ class serialNumber(Attr):
 
 @crans_attribute
 class start(intAttr):
+    __slots__ = ()
     ldap_name = "start"
     can_modify = [nounou]
     legend = "Date de début"
 
 @crans_attribute
 class end(intAttr):
+    __slots__ = ()
     ldap_name = "end"
     can_modify = [nounou]
     legend = "Date de fin"
 
 @crans_attribute
 class crlUrl(Attr):
+    __slots__ = ()
     ldap_name = "crlUrl"
     optional = True
     can_modify = [parent, nounou]
@@ -1686,6 +1768,7 @@ class crlUrl(Attr):
 
 @crans_attribute
 class revocked(boolAttr):
+    __slots__ = ()
     ldap_name = "revocked"
     singlevalue = True
     optional = True
@@ -1694,6 +1777,7 @@ class revocked(boolAttr):
 
 @crans_attribute
 class encrypted(boolAttr):
+    __slots__ = ()
     ldap_name = "encrypted"
     singlevalue = True
     optional = True
@@ -1702,6 +1786,7 @@ class encrypted(boolAttr):
 
 @crans_attribute
 class privatekey(Attr):
+    __slots__ = ()
     ldap_name = "privatekey"
     python_type = str
     can_modify = [parent, nounou]
@@ -1710,6 +1795,7 @@ class privatekey(Attr):
 
 @crans_attribute
 class csr(Attr):
+    __slots__ = ("data",)
     ldap_name = "csr"
     python_type = str
     can_modify = [parent, nounou]
@@ -1739,6 +1825,7 @@ class csr(Attr):
 
 @crans_attribute
 class certificat(Attr):
+    __slots__ = ("data",)
     ldap_name = "certificat"
     binary = True
     python_type = str
@@ -1799,6 +1886,7 @@ class certificat(Attr):
 
 @crans_attribute
 class certificatUsage(intAttr):
+    __slots__ = ()
     ldap_name = "certificatUsage"
     singlevalue = True
     can_modify = [parent, nounou]
@@ -1806,6 +1894,7 @@ class certificatUsage(intAttr):
 
 @crans_attribute
 class selector(intAttr):
+    __slots__ = ()
     ldap_name = "selector"
     singlevalue = True
     can_modify = [parent, nounou]
@@ -1813,6 +1902,7 @@ class selector(intAttr):
 
 @crans_attribute
 class matchingType(intAttr):
+    __slots__ = ()
     ldap_name = "matchingType"
     singlevalue = True
     can_modify = [parent, nounou]
@@ -1820,6 +1910,7 @@ class matchingType(intAttr):
 
 @crans_attribute
 class xid(intAttr):
+    __slots__ = ()
     ldap_name = "xid"
     category = 'id'
     unique = True
@@ -1830,6 +1921,7 @@ class xid(intAttr):
 
 @crans_attribute
 class hostCert(dnsAttr):
+    __slots__ = ()
     optional = False
     can_modify = [parent, nounou]
     ldap_name = "hostCert"
@@ -1850,6 +1942,7 @@ class shadowExpire(intAttr):
     Durée de validité du mot de passe d'un compte.
     On l'utilise en mettant sa valeur à 0 pour désactiver un compte
     """
+    __slots__ = ()
     optinal = True
     can_modify = [nounou, bureau]
     ldap_name = "shadowExpire"
diff --git a/lc_ldap.py b/lc_ldap.py
index 7068797..2ce54dc 100644
--- a/lc_ldap.py
+++ b/lc_ldap.py
@@ -82,6 +82,7 @@ def ldif_to_uldif(ldif):
 class lc_ldap(ldap.ldapobject.LDAPObject, object):
     """Connexion à la base ldap crans, chaque instance représente une connexion
     """
+    __slots__ = ("lockholder", "conn", "dn", "droits", "current_login", "_username_given")
     def __init__(self, dn=None, user=None, cred=None, uri=variables.uri,
                  readonly_dn=None, readonly_password=None):
         """Initialise la connexion ldap,
diff --git a/ldap_locks.py b/ldap_locks.py
index c23c201..1492906 100644
--- a/ldap_locks.py
+++ b/ldap_locks.py
@@ -86,6 +86,7 @@ class LdapLockHolder:
     """
     Système de gestion des locks pour une instance de lc_ldap.
     """
+    __slots__ = ("locks", "host", "pid", "conn", "timeout")
     def __init__(self, conn):
         """
         On crée la connexion, et on crée un dico vide.
diff --git a/objets.py b/objets.py
index a161b90..65532a8 100644
--- a/objets.py
+++ b/objets.py
@@ -66,14 +66,6 @@ import cranslib.deprecated
 
 #: Champs à ignorer dans l'historique
 HIST_IGNORE_FIELDS = ["modifiersName", "entryCSN", "modifyTimestamp", "historique"]
-crans_account_attribs = [attributs.uid, attributs.canonicalAlias, attributs.solde,
-                                           attributs.contourneGreylist, attributs.derniereConnexion,
-                                           attributs.homepageAlias, attributs.loginShell, attributs.gecos,
-                                           attributs.uidNumber, attributs.homeDirectory,
-                                           attributs.gidNumber, attributs.userPassword,
-                                           attributs.mailAlias, attributs.cn, attributs.rewriteMailHeaders,
-                                           attributs.mailExt, attributs.compteWiki, attributs.droits,
-                                           attributs.shadowExpire]
 
 def new_cransldapobject(conn, dn, mode='ro', uldif=None, lockId=None):
     """Crée un objet :py:class:`CransLdapObject` en utilisant la classe correspondant à
@@ -107,6 +99,7 @@ class CransLdapObject(object):
     Cette classe ne devrait pas être utilisée directement."""
 
     """ Qui peut faire quoi ? """
+    __slots__ = ("in_context", "conn", "lockId", "attrs", "_modifs", "dn", "parent_dn", "mode")
     can_be_by = { variables.created: [attributs.nounou],
             variables.modified: [attributs.nounou],
             variables.deleted: [attributs.nounou],
@@ -218,9 +211,9 @@ class CransLdapObject(object):
         # Sortie du context manager
         self.in_context = False
         # On rend les écriture impossible
-        self.save = self._out_of_context
-        self.create = self._out_of_context
-        self.delete = self._out_of_context
+        #self.save = self._out_of_context
+        #self.create = self._out_of_context
+        #self.delete = self._out_of_context
         # On retombe en read only
         self.mode = 'ro'
         # On purge les lock de l'objet
@@ -805,6 +798,7 @@ class ObjectFactory(object):
        Cette classe n'est jamais instanciée.
 
        """
+    __slots__ = ()
     _classes = {}
 
     @classmethod
@@ -830,6 +824,7 @@ def crans_object(classe):
 
 @crans_object
 class InetOrgPerson(CransLdapObject):
+    __slots__ = ()
     ldap_name = "inetOrgPerson"
     def __repr__(self):
         return str(self.__class__.__name__) + " : cn=" + str(self['cn'][0])
@@ -837,16 +832,33 @@ class InetOrgPerson(CransLdapObject):
 
 class proprio(CransLdapObject):
     u""" Un propriétaire de machine (adhérent, club…) """
+    __slots__ = ("_machines", "_factures", "full")
     can_be_by = { variables.created: [attributs.nounou, attributs.bureau, attributs.cableur],
             variables.modified: [attributs.nounou, attributs.bureau, attributs.soi, attributs.cableur],
             variables.deleted: [attributs.nounou, attributs.bureau,],
     }
 
-    attribs = [attributs.nom, attributs.chbre, attributs.paiement, attributs.info,
+
+    crans_account_attribs = [attributs.uid, attributs.canonicalAlias, attributs.solde,
+                                           attributs.contourneGreylist, attributs.derniereConnexion,
+                                           attributs.homepageAlias, attributs.loginShell, attributs.gecos,
+                                           attributs.uidNumber, attributs.homeDirectory,
+                                           attributs.gidNumber, attributs.userPassword,
+                                           attributs.mailAlias, attributs.cn, attributs.rewriteMailHeaders,
+                                           attributs.mailExt, attributs.compteWiki, attributs.droits,
+                                           attributs.shadowExpire]
+    default_attribs = [attributs.nom, attributs.chbre, attributs.paiement, attributs.info,
             attributs.blacklist, attributs.controle, attributs.historique,
             attributs.debutAdhesion, attributs.finAdhesion, attributs.debutConnexion,
             attributs.finConnexion]
 
+    @property
+    def attribs(self):
+        if u'cransAccount' in self['objectClass']:
+            return self.default_attribs + self.crans_account_attribs
+        else:
+            return self.default_attribs
+
     def __repr__(self):
         return str(self.__class__.__name__) + " : nom=" + str(self['nom'][0])
 
@@ -854,9 +866,6 @@ class proprio(CransLdapObject):
         super(proprio, self).__init__(*args, **kwargs)
         self._machines = None
         self._factures = None
-        if u'cransAccount' in self['objectClass']:
-            self.attribs = self.attribs + crans_account_attribs
-            self.full = True
 
     def delete_compte(self, mail):
         # Je pense qu'en pratique cette vérification ne sert à rien puisqu'on se fera jetter à la tentative de modification
@@ -880,7 +889,6 @@ class proprio(CransLdapObject):
             self['mailExt']=[]
             self['uid' ]=[]
             self._modifs['objectClass'] = [u'adherent']
-            self.attribs = list(set(self.attribs).difference(crans_account_attribs))
             self.full = False
 
 
@@ -907,9 +915,6 @@ class proprio(CransLdapObject):
             if os.path.exists("/var/mail/" + login):
                 raise ValueError('Création du compte impossible : /var/mail/%s existant' % str(login))
 
-            if not self.full:
-                self.attribs = self.attribs + crans_account_attribs
-                self.full = True
             self['uid' ] = [login]
             self['homeDirectory'] = [home]
             self['mail'] = [login + u"@crans.org"]
@@ -1094,6 +1099,7 @@ class proprio(CransLdapObject):
 
 class machine(CransLdapObject):
     u""" Une machine """
+    __slots__ = ("_proprio", "_certificats")
     can_be_by = { variables.created: [attributs.nounou, attributs.bureau, attributs.cableur, attributs.parent, attributs.respo],
             variables.modified: [attributs.nounou, attributs.bureau, attributs.cableur, attributs.parent, attributs.respo],
             variables.deleted: [attributs.nounou, attributs.bureau, attributs.cableur, attributs.parent, attributs.respo],
@@ -1272,6 +1278,7 @@ class machine(CransLdapObject):
 
 class AssociationCrans(proprio):
     """ Association crans (propriétaire particulier)."""
+    __slots__ = ()
     def save(self):
         pass
 
@@ -1284,18 +1291,22 @@ class AssociationCrans(proprio):
         return str(self.__class__.__name__) + " : Le Crans"
 
 class BaseInvites(proprio):
-   u"""Un artefact de la base ldap"""
+    u"""Un artefact de la base ldap"""
+    __slots__ = ()
+    def __repr__(self):
+        return str(self.__class__.__name__)
 
-   def __repr__(self):
-       return str(self.__class__.__name__)
-
-   def delete(self, comm, login):
+    def delete(self, comm, login):
         raise EnvironmentError("Les pauvres invites")
 
 @crans_object
 class adherent(proprio):
     u"""Adhérent crans."""
-    attribs = proprio.attribs + [attributs.aid, attributs.prenom, attributs.tel,
+    __slots__ = ("_clubs", "_imprimeur_clubs")
+
+    @property
+    def attribs(self):
+        return super(adherent, self).attribs + [attributs.aid, attributs.prenom, attributs.tel,
                                  attributs.mail, attributs.mailInvalide, attributs.charteMA,
                                  attributs.derniereConnexion, attributs.gpgFingerprint,
                                  attributs.carteEtudiant, attributs.etudes,
@@ -1334,23 +1345,32 @@ class adherent(proprio):
 @crans_object
 class club(proprio):
     u"""Club crans"""
+    __slots__ = ()
     can_be_by = { variables.created: [attributs.nounou, attributs.bureau, attributs.cableur],
             variables.modified: [attributs.nounou, attributs.bureau, attributs.respo, attributs.cableur],
             variables.deleted: [attributs.nounou, attributs.bureau],
     }
-    attribs = proprio.attribs + [attributs.cid, attributs.responsable, attributs.imprimeurClub]
     ldap_name = "club"
 
+    @property
+    def attribs(self):
+        return super(club, self).attribs + [attributs.cid, attributs.responsable, attributs.imprimeurClub]
+
+    def __init__(self, *args, **kwargs):
+        super(club, self).__init__(*args, **kwargs)
+
     def __repr__(self):
         return "Club : " + str(self['nom'][0])
 
 @crans_object
 class machineFixe(machine):
     u"""Machine fixe"""
+    __slots__ = ()
     ldap_name = "machineFixe"
 
 class machineMulticast(machine):
     u"""Machine pour inféré à partir des announces sap"""
+    __slots__ = ()
     ldap_name = None
     def save(self):
         pass
@@ -1368,6 +1388,7 @@ class machineMulticast(machine):
 @crans_object
 class machineWifi(machine):
     u"""Machine wifi"""
+    __slots__ = ()
     attribs = machine.attribs + [attributs.ipsec]
     ldap_name = "machineWifi"
 
@@ -1388,6 +1409,7 @@ class machineWifi(machine):
 
 @crans_object
 class machineCrans(machine):
+    __slots__ = ()
     can_be_by = { variables.created: [attributs.nounou],
             variables.modified: [attributs.nounou],
             variables.deleted: [attributs.nounou],
@@ -1397,6 +1419,7 @@ class machineCrans(machine):
 
 @crans_object
 class borneWifi(machine):
+    __slots__ = ()
     can_be_by = { variables.created: [attributs.nounou],
             variables.modified: [attributs.nounou],
             variables.deleted: [attributs.nounou],
@@ -1407,6 +1430,7 @@ class borneWifi(machine):
 
 @crans_object
 class switchCrans(machine):
+    __slots__ = ()
     can_be_by = { variables.created: [attributs.nounou],
                   variables.modified: [attributs.nounou],
                   variables.deleted: [attributs.nounou],
@@ -1417,6 +1441,7 @@ class switchCrans(machine):
 
 @crans_object
 class facture(CransLdapObject):
+    __slots__ = ("_proprio", "_has_frais", "_recuPaiement", "_article_frais")
     can_be_by = { variables.created: [attributs.nounou, attributs.bureau, attributs.cableur],
             variables.modified: [attributs.nounou, attributs.bureau, attributs.cableur],
             variables.deleted: [attributs.nounou, attributs.bureau, attributs.cableur],
@@ -1427,16 +1452,16 @@ class facture(CransLdapObject):
                attributs.finConnexion, attributs.controle ]
     ldap_name = "facture"
 
-    _proprio = None
-
     def __repr__(self):
         return str(self.__class__.__name__) + " : fid=" + str(self['fid'][0])
 
     #### GROS HACK pour rester comptatible avec ldap_crans où l'article representant les frais n'est ajouté qu'une fois le paiement reçu
     def __init__(self, *args, **kwargs):
+        self._proprio = None
         super(facture, self).__init__(*args, **kwargs)
         self._has_frais = True if [art for art in self.attrs.get('article', []) if art['code'] != 'FRAIS'] else False
         self._recuPaiement = True if self['recuPaiement'] else False
+        self._article_frais = None
 
     def __getitem__(self,attr, default=None):
         ret = super(facture, self).__getitem__(attr, default)
@@ -1451,7 +1476,6 @@ class facture(CransLdapObject):
              raise EnvironmentError("Paiement déjà effectué pour cette facture, impossible de modifier son contenu")
          return super(facture, self).__setitem__(attr, value)
 
-    _article_frais = None
     def _frais(self, mode=None):
         if mode is None:
             mode = self['modePaiement'][0]
@@ -1536,11 +1560,12 @@ class facture(CransLdapObject):
 
 @crans_object
 class baseCert(CransLdapObject):
+    __slots__ = ("_machine",)
     can_be_by = { variables.created: [attributs.nounou, attributs.bureau, attributs.parent],
             variables.modified: [attributs.nounou, attributs.bureau, attributs.parent],
             variables.deleted: [attributs.nounou, attributs.bureau, attributs.parent],
     }
-    attribs = [ attributs.xid, attributs.certificat, attributs.hostCert, attributs.historique,
+    default_attribs = [ attributs.xid, attributs.certificat, attributs.hostCert, attributs.historique,
                 attributs.info, attributs.csr ]
 
     tlsa_attribs = [ attributs.certificatUsage, attributs.selector, attributs.matchingType,
@@ -1550,11 +1575,24 @@ class baseCert(CransLdapObject):
 
     private_attribs = [ attributs.privatekey, attributs.encrypted ]
 
+    @property
+    def attribs(self):
+        attribs = list(self.default_attribs)
+        if "TLSACert" in self['objectClass']:
+            attribs.extend(self.tlsa_attribs)
+        if 'x509Cert' in self['objectClass']:
+            attribs.extend(self.x509_attribs)
+        if "privateKey" in self['objectClass']:
+            attribs.extend(self.private_attribs)
+        return attribs
     ldap_name = "baseCert"
 
     protected_issuer = [u'CAcert Class 3 Root', u'CA Cert Signing Authority']
 
-    _machine = None
+    def __init__(self, *args, **kwargs):
+        self._machine = None
+        super(baseCert, self).__init__(*args, **kwargs)
+
 
     def __repr__(self):
         if self['info']:
@@ -1562,14 +1600,6 @@ class baseCert(CransLdapObject):
         else:
             return "Certificat : xid=" + str(self['xid'][0])
 
-    def update_attribs(self):
-        if "TLSACert" in self['objectClass']:
-            self.attribs.extend(self.tlsa_attribs)
-        if 'x509Cert' in self['objectClass']:
-            self.attribs.extend(self.x509_attribs)
-        if "privateKey" in self['objectClass']:
-            self.attribs.extend(self.private_attribs)
-
     def _check_setitem(self, attr, values):
         """
         Vérifie des contraintes non liées à LDAP lors d'un __setitem__,
@@ -1589,7 +1619,7 @@ class baseCert(CransLdapObject):
         if u"privateKey" in self['objectClass']:
             return
         self._modifs['objectClass'].append(u"privateKey")
-        self.attribs.extend(self.private_attribs)
+        #self.attribs.extend(self.private_attribs)
         self['encrypted']=encrypted
         self['privatekey']=privatekey
 
@@ -1599,7 +1629,7 @@ class baseCert(CransLdapObject):
         if u"TLSACert" in self['objectClass']:
             return
         self._modifs['objectClass'].append(u"TLSACert")
-        self.attribs.extend(self.tlsa_attribs)
+        #self.attribs.extend(self.tlsa_attribs)
         self['certificatUsage']=certificatUsage
         self['matchingType']=matchingType
         self['selector']=0
@@ -1610,7 +1640,7 @@ class baseCert(CransLdapObject):
         if u"x509Cert" in self['objectClass']:
             return
         self._modifs['objectClass'].append(u"x509Cert")
-        self.attribs.extend(self.x509_attribs)
+        #self.attribs.extend(self.x509_attribs)
         self['issuerCN'] = issuerCN
         self['start'] = start
         self['end'] = end
@@ -1639,6 +1669,7 @@ class baseCert(CransLdapObject):
 
 @crans_object
 class service(CransLdapObject):
+    __slots__ = ()
     ldap_name = "service"
 
 
diff --git a/services.py b/services.py
index b9f1e77..0db21e8 100644
--- a/services.py
+++ b/services.py
@@ -398,6 +398,7 @@ def services_to_restart(conn, old_attrs={}, new_attrs={}, created_object=[], del
 # Identique à la classe dans ldap_crans.py
 class Service:
     """ Définit un service à redémarrer """
+    __slots__ = ("nom", "args", "start")
     def __init__(self, nom, args=[], start=[]):
         """
         Nom du service