Very slow editor navigation when selecting hierarchy/project items.

I have a 1-3 second delay before update when navigating between hierarchy/project items.

When the solution doesn't compile, however, it works fine without delay. I can't seem to tie this to any recent changes made... I have also tried on 3 different PCs where I didn't have the problem on 1 of them, they had identical settings and OS. It also doesn't matter what scene I'm in, but it is tied to the project.

Save me!

 

I have the same issue, though the delay is not quite as long as 3 seconds.

 

Solved: It was the plugin "Editor Plus" history cache that didn't seem to be managed properly, or at least not effectively enough for a larger project.