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Re:Terminal and shell performance by SomeHacker44 on Tuesday July 18, 2017 @11:22PM (#14801829)
I had the same problem. After using terminal.app exclusively for literally 13 years it became unstable and unusable for me on the new Touch Bar Mac and I switched to iTerm2. That is a noticeably slower program, especially with a big scroll back, but at least it's stable!

I have no idea what the cause of the instability was but I couldn't fix it and couldn't tolerate it.

Re:Terminal and shell performance by eridius on Wednesday July 19, 2017 @06:32PM (#14808589)
You might be happy to know that macOS 10.12.6 (released today) says it "Improves the stability of Terminal app".
Re:Terminal and shell performance by ckw on Wednesday July 19, 2017 @04:34AM (#14802754)
I had a similar issue recently with a touch bar mac. It would crash pretty reliably when deleting lines during interactive rebases. This was in tmux with EDITOR=vim, hitting dd.