Very bad performance in 4.12.5 with alot of hanging

I have just installed 4.12.5 and it hangs terribly! I was using 4.10 until now it was perfectly fine but in 4.12.5 everytime I am trying to open a new material or asset in other window I have to wait like a minute or two . Is there any fix to this problem?

I’m wondering if you’ve had any success with this yet. I’ve been having the exact same problem but only recently. 4.12.5 was working fine, have been working a project in it for a few weeks, but now out of nowhere i’m getting a lot of hanging and terrible framerate, i can’t figure out what could have caused this.