We have migrated from Tridion 2011 to 2013 recently and we are facing a couple of issues which are pointed below.
Users from a particular group are unable to log in to Tridion (These users are not administrators in Tridion). taking more than ten to fifteen minutes to login and by that time the CPU is peaking very high.
When the same users in the same group are given administrator access the users are able to log in to Tridion.
Also when the user is connecting to Tridion CME the user is getting a blank page and also the CPU is peaking to high and with in few minutes it becomes 100%.
Also we observed that the user from that specific group which is not working when left for 10 min after entering his credentials,he was able to login and CPU memory was reduced and from then the normal operations were working fine.
This is not the case with other groups.
Never faced this issue with Tridion 2011.
Can any one please help us in resolving this issue?