Poor Editor performance after CPU upgrade

[anon20000101]

A few days ago I upgraded my CPU to an i5 6600K, I reinstalled windows and Unity. Since than the Editor has really poor performance. Builds and other games work fine. Anyone knows whats going on?
Integrated Graphics are disabled in BIOS/UEFI

specs
i5 6600K
GTX 780
8GB Ram
Windows 10

[jessee03]

Have you tried using a 32 bit version to see if that changes anything for performance? I’ve had issues with the 64 bit version in the past.