commit 619e156986dde1b674fa1e56bad4bc862c6e9df3
Author: Victor Campos <victor.campos@visagio.com>
Date:   Tue Jul 12 19:37:14 2016 -0300

    improve update/create speed

diff --git a/app/models/project.rb b/app/models/project.rb
index 660a486..88bd8eb 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -524,7 +524,7 @@ class Project < ActiveRecord::Base
   # Returns the users that should be notified on project events
   def notified_users
     # TODO: User part should be extracted to User#notify_about?
-    members.select {|m| m.principal.present? && (m.mail_notification? || m.principal.mail_notification == 'all')}.collect {|m| m.principal}
+    members.includes(:principal).select {|m| m.principal.present? && (m.mail_notification? || m.principal.mail_notification == 'all')}.collect {|m| m.principal}
   end
 
   # Returns a scope of all custom fields enabled for project issues