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Showing content from https://github.com/QuarticCat/zsh-fastcache below:

QuarticCat/zsh-smartcache: A Zsh plugin to cache command output to boost shell startup.

A Zsh plugin to cache command output to boost shell startup.

It basically has the same functionality as evalcache, except that

It will automatically update the cache and inform you, while evalcache will never update the cache until you clear them. This operation is done in the background, so it has no effect on the satrtup time.
It also supports caching completions. (experimental)

Here are some benchmark results. (CPU: Ryzen 3700X)

Benchmarked by hyperfine 'zsh -ic exit' and comparing the differences.

command version raw eval zsh-smartcache evalcache rbenv init 1.2.0 ~48ms ~23.5ms ~23.5ms hub alias 2.14.2 ~2.5ms ~1.5ms ~1.5ms scmpuff init 0.5.0 ~2.5ms ~2ms ~2ms

Some changes from evalcache's results:

Only the subsequent runs are recorded. The first run has a fixed extra cost (~1ms).
Speedup of rbenv init is much lower, since the command output now includes rbenv calls, which are super slow.
hub alias and scmpuff init are superfast now.

eval "$(rbenv init -)"
# change to
smartcache eval rbenv init -

rustup completions zsh > ~/.zfunc/_rustup
fpath+=~/.zfunc
# change to
smartcache comp rustup completions zsh

ZSH_SMARTCACHE_DIR: cache files storage, default to ${XDG_CACHE_HOME:-$HOME/.cache}/zsh-smartcache.

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