Thanks for trying! The browser version is overly demanding on CPU, native should be much better. Anw. both run smoothly for me on a Ryzen 3000 series. Drop your system specs here if you have the time, would be interesting.
Ahh, macOS, interesting. Nice to see the game runs at all.
The performance problem in this case is that VRAM 1.5G is too small to hold all textures and buffers. Some driver will be swapping stuff back and forth between RAM and VRAM. This is a bigger FPS killer than slow CPU.