Hey Oleksandr- Sketch import is one key area of focus and improvement right now. We added it a few builds back, and while its not optimized right now its getting better with each pass. We'd love to hear more about your 'from scratch' experience in the tool as well (not importing but starting a new file). We recognize that there are still some big speed gains to be made on that import sequence. Thanks for being part of the early access- keep hitting that feedback button in-app and shoot us anything you run into- we're reading every single one of these and adjusting our focus and priorities accordingly.