I think the article misses the actual point?

The browser is faster because they went native, in particular, GPU.

Every issue described is text rendering related. Everyone.

And I would bet most of the SwiftUI issues could be solved with a text render cache.

Something like Casey Murati's refterm toy that showed what that can do with no other optimizations, or the work for GPU accelerated terminal emulators like alacritty or ghostty.