I’ve found the performance of iTerm in particular to be far inferior to builtin, especially when the buffer grows large. iTerm even has a fixed buffer size by default and still has worse performance.
Alacritty is supposed to be fast, but then doesn’t support any scrolling, has a poor window resizing flow, and doesn’t have tabs. The suggestion is to use tmux for all that, but then Alacritty+tmux is slower than builtin.
- “performance” above means smoothness of scrolling and general “perceived performance” type things. Haven’t actually tried any real tests.