System Information
Operating system: win10
Graphics card: 960 gtx
Blender Version
Broken: blender-2.80.0-git.a5b5bd2c24e0-windows64
Worked: (optional)
Very slow perfomance (system freezing) while working with subsurface modifier
Exact steps for others to reproduce the error
Make a cylinder with 120 edges and put a subsurface modifier on it