Macintosh slows down and usually hangs with more than 6-8 sketch windows open

Has anyone experienced a Macintosh affected by having multiple Arduino sketch windows open? This happens quite frequently but not sure if is normal behavior. Usually, if I want to get response, I will have to force Arduino to close and reopen because the Mac hangs (or seemingly so). I am running a MacBook Pro with 16GB of RAM.

More details, please :slight_smile:

What macOS version?
what IDE version?
does Activity Monitor show high CPU usage? Is everything slow, or just the IDE?