It's very frustrating I can't use a scaled resolution on my Mac because of PhpStorm.

PhpStorm has had performance issues on OSX for a very long time now, sometimes to the point of being unusable. I've written about these issues before, but it's good to keep a regularly updated list of what's going on. So without further ado: if you're on OSX (Sierra, High Sierra or Mojave); if you're experiencing PhpStorm performance issues, this post might help you.

https://stitcher.io/blog/phpstorm-performance-october-2018