diff --git a/web_notify/models/res_users.py b/web_notify/models/res_users.py
index 800380d2..f4738036 100644
--- a/web_notify/models/res_users.py
+++ b/web_notify/models/res_users.py
@@ -2,31 +2,45 @@
 # Copyright 2016 ACSONE SA/NV
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
 
-from openerp import api, models, _
+from openerp import api, fields, models, _
 
 
 class ResUsers(models.Model):
 
     _inherit = 'res.users'
 
+    @api.multi
+    @api.depends('create_date')
+    def _compute_channel_names(self):
+        for record in self:
+            res_id = record.id
+            record.notify_info_channel_name = 'notify_info_%s' % res_id
+            record.notify_warning_channel_name = 'notify_warning_%s' % res_id
+
+    notify_info_channel_name = fields.Char(
+        compute='_compute_channel_names', store=True, required=True)
+    notify_warning_channel_name = fields.Char(
+        compute='_compute_channel_names', store=True, requried=True)
+
     @api.multi
     def notify_info(self, message, title=None, sticky=False):
         title = title or _('Information')
-        self._notify_channel('notify_info', message, title, sticky)
+        self._notify_channel(
+            'notify_info_channel_name', message, title, sticky)
 
     @api.multi
     def notify_warning(self, message, title=None, sticky=False):
         title = title or _('Warning')
-        self._notify_channel('notify_warning', message, title, sticky)
+        self._notify_channel(
+            'notify_warning_channel_name', message, title, sticky)
 
     @api.multi
-    def _notify_channel(self, channel_name_prefix, message, title, sticky):
-        notification = {
+    def _notify_channel(self, channel_name_field, message, title, sticky):
+        bus_message = {
             'message': message,
             'title': title,
             'sticky': sticky
         }
-        bus_bus = self.env['bus.bus']
-        for record in self:
-            channel_name = channel_name_prefix + "_%s" % record.id
-            bus_bus.sendone(channel_name, notification)
+        notifications = [(getattr(record, channel_name_field), bus_message)
+                         for record in self]
+        self.env['bus.bus'].sendmany(notifications)
diff --git a/web_notify/tests/__init__.py b/web_notify/tests/__init__.py
new file mode 100644
index 00000000..03c963d7
--- /dev/null
+++ b/web_notify/tests/__init__.py
@@ -0,0 +1 @@
+from . import test_res_users
diff --git a/web_notify/tests/test_res_users.py b/web_notify/tests/test_res_users.py
new file mode 100644
index 00000000..f6751fed
--- /dev/null
+++ b/web_notify/tests/test_res_users.py
@@ -0,0 +1,51 @@
+# -*- coding: utf-8 -*-
+# Copyright 2016 ACSONE SA/NV
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from openerp.tests import common
+from openerp.addons.bus.models.bus import json_dump
+import mock
+
+
+class TestResUsers(common.TransactionCase):
+
+    def test_notify_info(self):
+        bus_bus = self.env['bus.bus']
+        domain = [
+            ('channel', '=',
+             json_dump(self.env.user.notify_info_channel_name))
+        ]
+        existing = bus_bus.search(domain)
+        self.env.user.notify_info(
+            message='message', title='title', sticky=True)
+        news = bus_bus.search(domain) - existing
+        self.assertEqual(1, len(news))
+        self.assertEqual(
+            '{"message":"message","sticky":true,"title":"title"}',
+            news.message)
+
+    def test_notify_warning(self):
+        bus_bus = self.env['bus.bus']
+        domain = [
+            ('channel', '=',
+             json_dump(self.env.user.notify_warning_channel_name))
+        ]
+        existing = bus_bus.search(domain)
+        self.env.user.notify_warning(
+            message='message', title='title', sticky=True)
+        news = bus_bus.search(domain) - existing
+        self.assertEqual(1, len(news))
+        self.assertEqual(
+            '{"message":"message","sticky":true,"title":"title"}',
+            news.message)
+
+    def test_notify_many(self):
+        # check that the notification of a list of users is done with
+        # a single call to the bus
+        with mock.patch('openerp.addons.bus.models.bus.ImBus.sendmany'
+                        ) as mockedSendMany:
+            users = self.env.user.search([(1, "=", 1)])
+            self.assertTrue(len(users) > 1)
+            users.notify_warning('message')
+            self.assertEqual(1, mockedSendMany.call_count)
+            self.assertEqual(len(users), len(mockedSendMany.call_args))