Earlier quoted context omitted.
> Offloads rendering to the GPU I don't understand this - isn't all rendering on a typical macOS or Linux desktop done via the GPU?
I believe the software has to take advantage of the GPU. The `foot` terminal renders on the CPU instead of the GPU, but beats GPU-accelerated `alacritty` anyway due to other effiency hacks described on their Performance page: https://codeberg.org/dnkl/foot/wiki/Performance
There are various ways to take advantage of the GPU -- the so-called GPU-accelerated terminals contain bespoke OpenGL programs ("shaders") to do rendering on the GPU. Here's an interesting way of doing it: https://tomscii.sig7.se/2020/11/How-Zutty-works