https://issuetracker.unity3d.com/issues/semaphore-dot-waitforsignal-causes-a-slow-editor-when-entering-play-mode?page=3
Unity Issue Tracker - Semaphore.WaitForSignal under Canvas.BuildBatch causes a slow editor in Play...
Steps to reproduce:1. Open the attached project "Temp Project" from the ownCloud link2. Open "Main Scene"3. Turn on the Profiler win...