Thanks for checking it out and for the feedback!
There are likely some opportunities to optimize the way I'm rendering the Grid, Pixel, and Sprite layers, especially when they are not in use. Under the hood there are a lot of objects on the canvas that are making that stuff work, which is probably increasing the cpu/gpu load. I'll do some more testing on mac this week and see if there are some things I can unload when not in use.
For capturing that text input away from the editor, check out chapter 15 in the manual. If you're already getting text input, you're pretty close, there's just one more line you'll need.
Cheers, and happy coding!
-- John