Re: slow startup of zsh (1x slower than bash)

[Peng Yu <pengyu.ut@xxxxxxxxx>]

On Thu, Dec 6, 2018 at 8:20 PM Sebastian Gniazdowski
<sgniazdowski@xxxxxxxxx> wrote:
>
> On Mon, 3 Dec 2018 at 17:28, Peng Yu <pengyu.ut@xxxxxxxxx> wrote:
> >
> > Hi,
> >
> > The following example shows that zsh startup time is much slower than
> > other shells. Can this be improved to at least as fast as bash?
> >
>
> Is it the last zsh version that's being tested? There was 2x startup
> improvement at 5.4 or something like this.

Here is the version. I have not set up zsh to do anything fancy. I
guess the slowness of startup is because zsh does too many things
upfront and has more features than other shells, and the increase in
startup time the price that zsh has to pay.

$ zsh --version
zsh 5.6.2 (x86_64-apple-darwin17.7.0)
$ cat ~/.zshrc
# Lines configured by zsh-newuser-install
HISTFILE=~/.histfile
HISTSIZE=1000
SAVEHIST=1000
bindkey -e
# End of lines configured by zsh-newuser-install
# The following lines were added by compinstall
zstyle :compinstall filename '/Users/pengy/.zshrc'

autoload -Uz compinit
compinit
# End of lines added by compinstall

> Also, Zplugin can load plugins after prompt, I load 20 plugins, and my
> startup times are:
>
> repeat 5 { time /usr/local/bin/zsh-5.6.2-dev-1 -i -c exit }
> /usr/local/bin/zsh-5.6.2-dev-1 -i -c exit  0,09s user 0,04s system
> 117% cpu 0,111 total
> /usr/local/bin/zsh-5.6.2-dev-1 -i -c exit  0,10s user 0,05s system
> 119% cpu 0,130 total
> /usr/local/bin/zsh-5.6.2-dev-1 -i -c exit  0,11s user 0,05s system
> 121% cpu 0,129 total
> /usr/local/bin/zsh-5.6.2-dev-1 -i -c exit  0,09s user 0,04s system
> 115% cpu 0,119 total
> /usr/local/bin/zsh-5.6.2-dev-1 -i -c exit  0,09s user 0,04s system
> 117% cpu 0,109 total
>
> I even load prompt after a default prompt, ~ 100 ms after it. The
> Star-Trek console-like impression this gives can be visible here:
> https://asciinema.org/a/156726 – much is going on, automatically, in
> background.
>
> > --
> > Regards,
> > Peng
>
> --
> Sebastian Gniazdowski
> News: https://twitter.com/ZdharmaI
> IRC: https://kiwiirc.com/client/chat.freenode.net:+6697/#zplugin
> Blog: http://zdharma.org



-- 
Regards,
Peng