throttle main message loop cost much time when i focus unityeditor form other

[superpepper]

anytime when i focus UnityEditor form other software or destop or vs . even i do nothing,just click in editor or out.i can not working until unity cost 10 second. anyone can help me? thanks very much.

[Joe-Censored]

Previous thread on the topic:

2017.2.0f3 Editor Very Slow?

Has anyone else found out that the Editor is extremely slow and choppy in 2017.2.0f3? I’m on a high end desktop and since switching to 2017.2 from 2017.1 my development experience has become absolutely horrible. Every single alt+tab back to the editor takes 1-2s for the editor to come back. Pressing “play” to get in takes something like 10s now to launch play mode, and for the first 15-20 seconds performance in the actual game window is something like 20-25FPS, and finally it settles to go to 6…

Several culprits identified in the thread, some bugs fixed in specific Unity versions, some assets you might have in your project, some external applications.