People have been using editors that look comparable for decades that dont need fancy GPU rendering to be fast and responsive. What is happening that stuff like that is necessary now?
GPU rendering in some form or another (mostly just bitblitting characters, I guess) has also been common for decades. Classic hardware text mode is basically just that. Also, display densities and sizes have gone up (for some of us).
The first time I used Zed, I really noticed and appreciated the very low latency between a keypress and visual result. It created a great sense of “connection” to the experience. (I’ve previously used VS Code, Emacs, Sublime Text, JetBrains, and others)