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I prefer iTerm2 for its features, but Terminal.app outperforms it in terms of responsiveness. I mostly notice this in Vim: iTerm gets choppy during scrolling and/or rapid cursor movement.
Is there anything I can do to improve iTerm's performance, or must I simply take the good with the bad? Would it be any better if I switched from bash to zsh, or is rendering speed totally unrelated to which shell I'm running?