Performance disclaimer

There is a section about caching on the frontpage of this module. Be sure to enable Internal Page Cache and disable BigPipe.

But yes, on-the-fly compiling will have a noticable performance impact. If you can't use Interal Page Cache, this module might not be a fitting tool for your site.

I'll try to communicate this soft dependency on Internal Page Cache module better in upcoming versions.

There is a little light on the horizon though, Tailwind Labs is rewriting the compiler to use LigthtningCSS (written in Rust) instead of PostCSS (written in NodeJS). This should bring some significant performance boosts, but I guess even the upcoming version will not be fast enough for uncached JIT compiling.