We are facing some issue with slowness of part of TC UI. UI is only slow when you are trying to access all pages connected with one build plan ( most used build plan in company ). It means if you are trying to access list of builds, or overview page of finished or running build of this particular build plan, it really getting slow. Rest of teamcity pages respond instantly.
My guess is that all threads waiting for synchronized BuildTypeTestsCache.optimizeBuildTests, but I think that you will see much more from attached thread dumps.
If you need more info about our deployment, let me know.
Thanks a lot,