diff --git a/radicale_odoo_storage/__init__.py b/radicale_odoo_storage/__init__.py
index c253c54..d26a3ab 100644
--- a/radicale_odoo_storage/__init__.py
+++ b/radicale_odoo_storage/__init__.py
@@ -139,8 +139,17 @@ class Collection(BaseCollection):
     def get_contacts_from_odoo(cls, login):
         """ Gets all contacts available from one Odoo login """
         cls.logger.info('Get contacts for Odoo user %s' % login)
-        partner_ids = cls.odoo.env['res.partner'].search([])
-        return ['res.partner:%s' % pid for pid in partner_ids]
+        fields = ['name', 'write_date', 'comment', 'street', 'street2', 'zip',
+                  'city', 'phone', 'mobile', 'fax', 'email', 'website',
+                  'function', 'comment', 'image',
+                  'category_id', 'parent_id', 'state_id', 'country_id']
+        partners = cls.odoo.execute_kw('res.partner', 'search_read', [[]],
+                                       {'fields': fields})
+        cls.partners = {p['id']: p for p in partners}
+        categs = cls.odoo.execute_kw('res.partner.category', 'search_read', [[]],
+                                     {'fields': ['name']})
+        cls.categs = {c['id']: c['name'] for c in categs}
+        return ['res.partner:%s' % pid for pid in cls.partners.keys()]
 
     @classmethod
     def get_events_from_odoo(cls, login, path):
@@ -182,49 +191,51 @@ class Collection(BaseCollection):
                 raise NotImplementedError
 
     @classmethod
-    def _generate_vcard_from_odoo(cls, partner):
+    def _generate_vcard_from_odoo(cls, database_id):
         """ Generate and return vCard object from Odoo res.partner record """
         # last_modified = strftime("%a, %d %b %Y %H:%M:%S GMT",
         #                          strptime(data.get('write_date'), '%Y-%m-%d %H:%M:%S'))
-        last_modified = str(partner.write_date)
+        partner = cls.partners.get(database_id)
+        last_modified = str(partner.get('write_date'))
         vobject_item = vobject.vCard()
         vobject_item.add('n')
         vobject_item.add('fn')
-        vobject_item.fn.value = partner.name
+        vobject_item.fn.value = partner.get('name')
         vobject_item.add('adr')
-        state_name = partner.state_id.name if partner.state_id else ''
-        country_name = partner.country_id.name if partner.country_id else ''
+        state_name = partner.get('state_id')[1] if partner.get('state_id') else ''
+        country_name = partner.get('country_id')[1] if partner.get('country_id') else ''
         vobject_item.adr.value = vobject.vcard.Address(
-            street=' '.join([partner.street or '', partner.street2 or '']),
-            code=partner.zip or '', city=partner.city or '',
+            street=' '.join([partner.get('street') or '', partner.get('street2') or '']),
+            code=partner.get('zip') or '', city=partner.get('city') or '',
             region=state_name, country=country_name)
-        if partner.image:
-            vobject_item.add('photo;encoding=b;type=jpeg').value = partner.image.replace('\n', '')
-        if partner.phone:
+        if partner.get('image'):
+            vobject_item.add('photo;encoding=b;type=jpeg').value = partner.get(
+                'image').replace('\n', '')
+        if partner.get('phone'):
             tel = vobject_item.add('tel')
             tel.type_param = 'Tel'
-            tel.value = partner.phone
-        if partner.mobile:
+            tel.value = partner.get('phone')
+        if partner.get('mobile'):
             tel = vobject_item.add('tel')
             tel.type_param = 'Mobile'
-            tel.value = partner.mobile
-        if partner.fax:
+            tel.value = partner.get('mobile')
+        if partner.get('fax'):
             tel = vobject_item.add('tel')
             tel.type_param = 'Fax'
-            tel.value = partner.fax
-        if partner.email:
-            vobject_item.add('email').value = partner.email
-        if partner.website:
-            vobject_item.add('url').value = partner.website
-        if partner.function:
-            vobject_item.add('role').value = partner.function
-        if partner.comment:
-            vobject_item.add('note').value = partner.comment
-        if partner.category_id:
-            categs = [categ.name for categ in partner.category_id]
+            tel.value = partner.get('fax')
+        if partner.get('email'):
+            vobject_item.add('email').value = partner.get('email')
+        if partner.get('website'):
+            vobject_item.add('url').value = partner.get('website')
+        if partner.get('function'):
+            vobject_item.add('role').value = partner.get('function')
+        if partner.get('comment'):
+            vobject_item.add('note').value = partner.get('comment')
+        if partner.get('category_id'):
+            categs = [cls.categs.get(cid) for cid in partner.get('category_id')]
             vobject_item.add('categories').value = categs
-        if partner.parent_id:
-            vobject_item.add('org').value = [partner.parent_id.name]
+        if partner.get('parent_id'):
+            vobject_item.add('org').value = [partner.get('parent_id')[1]]
         vobject_item.add('rev').value = last_modified
         return vobject_item
 
@@ -279,14 +290,11 @@ class Collection(BaseCollection):
         """Fetch a single item from Odoo database"""
         model, database_id = href.split(':')
         database_id = int(database_id[:-len(self.content_suffix)])
-        # fields = ['name', 'write_date', 'comment', 'street', 'street2', 'zip',
-        #           'city', 'state_id' 'country_id']
-        # data = self.odoo.execute(model, 'read', [database_id], fields)[0]
-        record = self.odoo.env[model].browse([database_id])
         if model == 'res.partner':
-            vobject_item = self._generate_vcard_from_odoo(record)
+            vobject_item = self._generate_vcard_from_odoo(database_id)
             return self._get_item_from_vobject(href, vobject_item)
         elif model == 'calendar.event':
+            record = self.odoo.env[model].browse([database_id])
             vobject_item = self._generate_ics_from_odoo(href, record)
             return self._get_item_from_vobject(href, vobject_item)
         else: