Really? I'm daily driving JetBrains IDEs on Apple M3 and don't recognize any if this. Just give it a bunch of extra heap memory (eg 4g instead if 1gb) and it's fast!
The issue is related to using a monorepo with lots of code in different languages - openening single folders is fine. Ut i want to be able to work on dozens of services in a single window, all other editors manage just fine