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docs(readme): rewrite notice on slow package counts in README

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Adrian Groh 2023-04-14 13:49:25 +02:00
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@ -66,10 +66,18 @@ Benchmarks performed on an AMD Ryzen 5 3600. Execution time is measured using
| Rust (v2.3.0) | 2.2 ± 0.2 | 1.8 | 3.9 | | Rust (v2.3.0) | 2.2 ± 0.2 | 1.8 | 3.9 |
_Note: This is with `pacman` and `flatpak` being the only installed package _Note: This is with `pacman` and `flatpak` being the only installed package
managers. Especially having `nix` installed will have a big impact on managers. For more info, see [Improving Performance](#imp_perf)._
performance, as querying installed `nix` packages is very costly. If you want to
skip slow package managers from being counted, you can set the <a name="imp_perf"></a>
`PF_FAST_PKG_COUNT` environment variable._
### Improving Performance
The by far slowest part of the `pfetch` execution time is counting the installed
packages. For most package managers this is still very fast, but there are some
(currently `nix` and `zypper`) that take ~500ms to report installed packages,
which takes away all performance benefits of the Rust version. If you have one
or more of these installed, you can skip counting them by setting the
`PF_FAST_PKG_COUNT` environment variable.
## Configuration ## Configuration