But maybe to add a little bit of context, "damage tracking" means for example, that if there is any ongoing animation (like a spinner), then only a small part of the screen will be re-rendered (with proper vertex-time scissors, so only relevant pixels will be computed). I am not sure if it makes sense in the context of a terminal emulator, but it's certainly a big issue for any non-toy GUI toolkits.

GPUs are incredibly fast parallel computers, so you will likely not observe any perf difference (unless you need order-dependent transparency which you don't), but it might improve your battery life significantly.