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Re:iTerm2 3.3 by uberduper on Thursday August 01, 2019 @07:23PM (#20589305)
Give neovim a try. Along with iterm gpu rendering, it's quite fast even with syntax highlighting and cursorline.

IIRC iterm2 has a setting to disable gpu rendering while on battery which is almost certainly your issue.

Re:iTerm2 3.3 by wyclif on Thursday August 01, 2019 @08:10PM (#20589593)
If you know how to set it up, iTerm2 + NeoVim + tmux + zsh is a pretty tasty combination.