Pretty snappy. All the gnome APIs are written in C. It doesn’t run on node, it runs on gnome-javascript (gjs) which exposes all the C APIs through JavaScript. If you use the Astal wrappers its pretty painless but using the gnome APIs directly in gjs is a little weird since you have to consider things like memory management.
That and old ass infected computers. I’ve used Linux almost exclusively for more than a decade. Fuck if I know how to fix your 10 year old windows desktop.