more specifically, I should say that re-rendering everything is kinda slow, the DrawText function which, uh, draws text, seems very heavy

blitting from a buffer onto the screen is, indeed, pretty fast, I've been experimenting with it and have some ideas for speeding things up

For real. I’ve tried porting several modern UI libraries to classic Mac, such as Nuklear, uGUI, and a couple of others. And I’ve succeeded in getting them working, but as soon as you start doing something with text, they fall on their face. Just having a text input is nearly impossible on an 8MHz 68000!

Proper text rendering is hard.