Hi,
We have arround 100 users. 99 user is running fine but one user have performance issues.
The problem is ; when a particular user tried for to view an issue it lasts 40-50 seconds 
Dashboards are loading fast for that user and server resources looks normal... I tried with same user on different computers and issues are opening slow again. Not a computer issue.
I tried with switch user plugin and it is also slow.
He's in the same profile with other users(groups, projects, roles etc.)
Any ideas?