I tried it out successfully for the first time the other day (had 1 false start some months ago). This is after 10 ish years of system wide installs or venvs. I didn't find it fast at all. Every time I went to run the script it spent multiple seconds checking dependencies. Then one time it updated one, which luckily didn't break anything but I did get concerned. I'm sure there're some flags I didn't know to use but uvx was not great. On the other hand, it did seem to install the packages faster than pip.

YMMV depending on specific needs but generally even on Windows on an average machine with an imperfect setup I've found it exceptionally fast, often well inside the sub-second range, to the point that I do sometimes worry if it really ran.

Sounds like it's worth another look at your settings to make sure they are right.

>I didn't find it fast at all.

Compared to what? Fast is relative. Compared to pip it's miles ahead.

I do avoid uv run for this reason but it’s useful for managing python projects. The speed claims actually have a lot to do with efficient caching, and I run several projects on the same Python (patch) version with similar packages on the same system

If you want to open an issue with verbose logs (`-vv`) I'd be happy to look into it. You can set `UV_LOG_CONTEXT=1` to emit timing information.

If you're running Python scripts, I'd recommend using `uv lock --script <path>` to generate a lockfile — we don't do that by default for scripts yet but that will avoid unexpected upgrades.

(I work on uv)