This is SUPER interesting. That is phenomenal feedback. I’m almost 100% certain that this is something that we can fix, although it might take some tinkering. Great job figuring out the root of the issue!
The first thing to try would be just to turn off the notification. You can do that here:
Unchecking this box will disable that feature:
I’ve run into the issue with it timing out when uploading a large file too. I think that we need to automatically disable connection monitoring while the file upload is in progress.
Disabling that check box might also fix your issue while cutting, but I’m not 100% sure. The UI shouldn’t require too much processing power so I’m surprised that it’s lagging, but that is excellent to know about and I will work on seeing if I can understand what’s going on and fix it.