Our client is having some issues with edit mode becoming very unresponsive and slow from time to time.
I am unable to reproduce this nor the EPiServer-support when I contacted them. Client is behind a virtualised Citrix-environment but facing the same issues when not using Citrix.
The server is not heavily loaded at all, and the site renders in ~500ms when not logged in. So, my question is, how do I go on to find what the bottleneck is? PerfMon and setting up Fiddler at the client computer?
Occasionally I've heard that gadgets can slow edit mode down, paricularly when they rely on external services/APIs. So it may be worth trying removing all but the essential gadgets to see if that traces the problem.