It doesn't load in (updated) Firefox, which is interesting. It only shows that the FPS is around 60. Not as many extension (vs LibreWolf). I rarely use FF (opting for LibreWolf).
On Brave (no extensions at all, except built in protections), the site runs at ~121FPS and the fonts look normal enough (no zoom, page at 100%). Fonts continue to look fine even when I zoom to 150% or higher.
I expected that my CPU temp would increase, maybe the fans might kick in... nothing. Cool as a cucumber. I have 4 browsers all opened on this page.
Interesting project. I read what @EvanAnderson wrote (evil software). I tend to agree. Respectfully, I don't see how this would be used. Browsers that already run JS don't need this. Browser that need this usually don't run JS (fails on Dillo, NetSurf, Lynx for example).