Editor slow down in 5.4.2

Hi there,


I am using Unity 5.4.2f2 and am experiencing significant slow down in the Editor. There seems to be an input delay of 5 - 10 seconds after I click within the edtior (menus, Project, Hierarchy etc) I looked up the issue on the unity forums and a few people mentioned about adding a "-d3d9-force" or 'open GL' tag in the Target tab of Unity Properties.

Unfortunately this hasn't resolved the issue. I still experience slow down even in a new project.
I have tried updating drivers, reinstalling Unity, trying 32 bit instead of 64.

Not having much luck here and it is really slowing me down.

Any help would be greatly appreciated.
Thank you in advance!

Computer specs:
Windows 10 Pro 64-bit
Intel Core i7 3930K
32.0GB DDR3
ASRock X79 Extreme4
2047MB NVIDIA GeForce GTX 980 Ti & 2047MB NVIDIA GeForce GTX 680

 

So Norty

 

The slowdown you speak of is the same one I experience. I'm currently trying to pin down the issue:

https://forum.unity3d.com/threads/editor-freeze-after-compile.488534/

 

I had this on 5.6.1p2 recently, and it was resolved when I uninstalled the latest Windows Update (KB4034674 IIRC)