* zsh-bench: Benchmark for interactive zsh
@ 2021-10-27 14:39 Roman Perepelitsa
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From: Roman Perepelitsa @ 2021-10-27 14:39 UTC (permalink / raw)
To: Zsh Users
I made this: https://github.com/romkatv/zsh-bench
- `zsh-bench` measures user-visible latency of interactive zsh: *input lag*,
*command lag*, etc. You can use it to benchmark your own shell.
- `human-bench` measures human perception of latency when using interactive
zsh. You can use it to check how it feels to use zsh with specific
latencies or to test whether you can tell a difference between 5ms and 0ms
- I've used `human-bench` to conduct a blind study on myself to find the
maximum values of latencies that are indistinguishable from zero. For
example, *command lag* below 10ms feels just like 0ms but anything above
this value starts feeling sluggish.
- I've used these threshold values to normalize benchmark results to see what
is fast and what is slow.
- Armed with this set of tools I've optimized two of my zsh projects:
powerlevel10k and zsh4humans. They used to be fairly fast but now they are
literally indistinguishable from instantaneous as far as human perception
- I've benchmarked many zsh techniques, plugins, frameworks and plugin
managers and have shared my observations in the document together with a
This is unlikely to be of practical use to many here but hopefully will prove
entertaining to a few.
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