I went through great lengths to get it somewhat usable on slow CPUs. This is really where I spent the majority of my time. Check out my blog post introducing nuklear QuickDraw here https://henlin.net/2021/12/21/Introducing-Nuklear-for-Macint... where I have it running the nuklear calculator demo on an 8mhz Macintosh emulator in your web browser. The less you try to do on slow systems the better it is.