> If first_prompt_lag of your shell is 600ms, zcompiling won't have
noticeable effects

Definitely agreed.  Fortunately, you can redefine "source" as a function
and trap all calls and measure how long it takes to load each file.

function source () {
    local __before="$EPOCHREALTIME"
    builtin source "$@"
    local __after="$EPOCHREALTIME"
    local __ms="$(( (__after - __before) * 1000 ))"
    echo "$__ms $@" >>| /tmp/zprezto-bench.$$.txt
}


In my case this narrowed it down pretty easily to some of the larger
functions that were getting parsed on shell-startup (deferring to
autoloaded functions being key).  Oddly, there is one source'd script that
seems to consistently have an issue with measurement of $EPOCHREALTIME.

I've managed to get first-prompt time down to ~300ms from ~650ms, and the
rest is a toss-up.  0.3s is fast enough for a login prompt for me!

$ rm -f /tmp/zprez* ; zsh -il -c exit; cat /tmp/zprez* | sort -rn | head
1638284631932.147 /Users/zachriggle/.zprezto/modules/zsh-z/init.zsh
119.97294425964355 /Users/zachriggle/.zprezto/modules/redacted1/init.zsh
85.247993469238281 /Users/zachriggle/.zprezto/modules/zach-riggle/init.zsh
47.258853912353516 /Users/zachriggle/.zprezto/modules/completion/init.zsh
30.105113983154297 /Users/zachriggle/.zprezto/modules/prompt/init.zsh
23.977041244506836
/Users/zachriggle/.zprezto/modules/redacted2/scripts/init.zsh
20.226001739501953 /Users/zachriggle/.zprezto/modules/zach-riggle/path.zsh
19.911050796508789
/Users/zachriggle/.zprezto/modules/syntax-highlighting/init.zsh
19.558191299438477
/Users/zachriggle/.zprezto/modules/syntax-highlighting/external/zsh-syntax-highlighting.zsh


*Zach Riggle*


On Tue, Nov 30, 2021 at 6:30 AM Roman Perepelitsa <
roman.perepelitsa@gmail.com> wrote:

> On Tue, Nov 30, 2021 at 12:49 PM Zach Riggle <zachriggle@gmail.com> wrote:
> >
> > > FWIW, I zcompile my own rc files
> >
> > What is the optimal way to compile a huge set of them?
>
> Most of the zsh files you are using are *installed* rather than
> modified by yourself. You can zcompile them when you install/update
> them. E.g., you have some code that installs/updates prezto. Invoke
> zcompile in there.
>
> There are also zsh startup files that you modify manually every now
> and then (.zshrc, etc.). Compiling these files is harder and is more
> likely to cause issues. On the other hand, the benefits of compiling
> them are tiny, simply because those files are tiny. Once again, you
> can manually zcompile different things and check whether you notice
> any difference. If you don't, there is no need to invest in
> zcompiling.
>
> If first_prompt_lag of your shell is 600ms, zcompiling won't have
> noticeable effects. You'll need to optimize other things first for
> zcompiling to matter.
>
> Roman.
>