When I make a new quick selection pixelmator pro is fast and responsive, but when I then Add or Substract to that selection things slow to a crawl, and it takes ages for the cursor to respond, the UI to update the selection and yellow colouring.
Inspecting the pixelmator pro app in activity monitor shows 6931422 faults so something must be up... I've had the same issue in High Sierra and Mojave Mac os on a 2017 macbook pro.
Is something not working like it should? Let us know.
Hey Chris, this may well have something to do with specific files as it's not an easily reproducible issue on our side — could you send us an email at firstname.lastname@example.org about this? We'll dig deeper into what could be going on.