I have a large game project with a lot of prefabs with FSMs. I'm getting lengthy freezes in editor when adding, deleting, creating, or sometimes even selecting a prefab. The freezes are initially 5-10 sec long, but the longer I have Unity open the longer they get, (up to minutes long and beyond). Resetting Unity resets them to 5-10 sec but they will start to quickly grow again. A post on Reddit mentioned Unity replaced some Editor UI stuff (IMGUI) in 2019. It said if something (perhaps PlayMaker) still uses IMGUI then it might create these freezes. But this is all over my head.
This is all very strange and it's crippling to work with. Any help from anyone here would be heaven sent.
I've attached some images as well.
