Everytime I go to the designer Visual Studio freezes(Not Responding) for 30+ seconds and once I click on any element/widget after that, it freezes
Designer stopped freezing once I deleted the content of this folder:
C:\Users\ ...\AppData\Local\Microsoft\VisualStudio\14.0
This solve my problem : Visual Studio 2015 crashes
Also you can see this link: You experience performance issues, product crashes, or rendering issues in Visual Studio 2015 and Visual Studio 2013