I'm having a problem with this using different versions.. With Unity 2017.4. I finally got PM to update to 1.85 and 1.9 but in both versions the editor runs very slowly for large fsms. It might take 30 seconds to make a simple change.
It also takes a really long time to engage play mode in editor and exiting play mode.
I was using 1.7xx before with no problems.
I tried all of the preference options.
I should mention I was also using 5.3.4 with 1.7xx.