Sketchup 2019 has slowed right down


My SketchUp Pro 2019 has recently slowed right down. It lags even if I’m in a really small model and freezes/shuts frequently.

I’ve tried disconnecting my second screen and tried to delete my extensions, but the extensions manager wouldn’t even load.

Does anyone have any suggestions as to what I can do to sort this out? It’s getting to the point where it’s really hard to do anything!

I’m using an iMac Pro (2017)

Thanks so much!

What does your Activity Monitor tell you when this happens?