[jeremyjh]

What it says is this:

> uv is fast because of what it doesn’t do, not because of what language it’s written in. The standards work of PEP 518, 517, 621, and 658 made fast package management possible. Dropping eggs, pip.conf, and permissive parsing made it achievable. Rust makes it a bit faster still.

[rowanG077]

Yes exactly! That quote directly disproves that all of the improvements UV has over competitors is because of algos, not because of rust.

So the claim is not well supported at all by the article as you stated, in fact the claim is literally disproven by the article.

[kyralis]

This is either an overly pedantic take or a disingenuous one. The very first line that the parent quoted is

> uv is fast because of what it doesn’t do, not because of what language it’s written in.

The fact that the language had a small effect ("a bit") does not invalidate the statement that algorithmic improvements are the reason for the relative speed. In fact, there's no reason to believe that rust without the algorithmic version would be notably faster at all. Sure, "all" is an exaggeration, but the point made still stands in the form that most readers would understand it: algorithmic improvements are the important difference between the systems.

[rowanG077]

I think we might be talking past each other a bit.

The specific claim I was responding to was that all of uv’s performance improvements come from algorithms rather than the language. My point was just that this is a stronger claim than what the article supports, the article itself says Rust contributes “a bit” to the speed, so it’s not purely algorithmic.

I do agree with the broader point that algorithmic and architectural choices are the main reason uv is fast, and I tried to acknowledge that, apparently unsuccessfully, in my very my first comment (“I don't doubt that a lot of uv's benefits are algo. But everything?”).

[ambicapter]

You are being very pedantic here.

[jeremyjh]

You are right. 99% is not 100%.

[rowanG077]

I don't think the article has substantive numbers. You'd have to re-implement UV in python to do that. I don't think anyone did that. It would be interesting at least to see how much UV spends in syscalls vs PIP and make a relative estimate based on that.