I'm using OS X 10.8 and lately I'm noticing that iTerm2 can sometimes be quite slow with opening a new shell. It takes around 5 seconds before I can do something. Might not seem a lot, but I work a lot in the shell so it can get pretty annoying.

I'm using ZSH with oh-my-zsh.

I've tried Terminal, uninstalling oh-my-zsh, clearing everything unnecessary from the startup files (.zshenv, .zlogin, .zprofile, .zshrc, .zlogout) and clearing the ASL-files in /var/log/asl and although it goes down a bit (like 0.20s), there's nothing that brings it down to pretty instantaneous or even below 3.0s.

Does anyone happen to have another idea?

  • Related questions: 31403, 41743, 236953, 444614 – Lri Nov 30 '12 at 14:22
  • Have you tried changing the command for new shells to something like login -pfq username /usr/local/bin/zsh? – Lri Nov 30 '12 at 14:23
  • @lauri-ranta: Tried everything in those other threads, but to no avail. Trying "login -pfq username /usr/local/bin/zsh" did nothing as well. – Dimitri Nov 30 '12 at 15:53
  • To see if it is shell- or iTerm2 related: how much time does it take to start a new shell? (by entering zsh in an already open terminal window)? – Matteo Jan 5 '13 at 16:13
  • add to .zshrc : [ $((RANDOM & 1)) -eq 0 ] && do not sleep 5 – theoden8 Aug 11 '15 at 14:04

Clear log in /var/log/asl, i.e.,

rm -rf /var/log/asl/*.asl
  • 1
    Could you explain WHY iterm is being slowed down by this log folder and is there anything that can be done to actually stop this problem from happening? – David Aug 11 '14 at 19:56
  • 2
    @david you can check this link for understanding the reason why new tabs are slow. apple.stackexchange.com/a/71930/89583 – Archan Mishra Aug 11 '15 at 5:17
  • Wow --- thank you so much --- for iterm2 it seems that the answer is to use the suggestion at the bottom of that page (/bin/bash -il ) from the guy who got downvoted to -1. Works great. – David Aug 11 '15 at 13:58

Per comment from Archan Mishra above, for iTerm 2 the answer is to set up a custom terminal command /bin/bash -il which bypasses searching the system ASL logs completely. iterm2 opens instantly now.

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