[IshKebab]

Which has very disappointing benchmarks at the moment - even slower than some Python and Ruby stacks:

https://www.techempower.com/benchmarks/#section=data-r12&hw=...

I'm not sure why this is - I've Googled to no avail - but it is rather worrying.

[steveklabnik]

I've been doing some work on these benchmarks. They appear really slow to me as well; I found the environment really hard to set up, though, so I haven't quite figured out how to identify why they're this way.

[andrewflnr]

When you see Rust being "slower than Ruby" it's usually because you forgot to turn off debug mode.

[frewsxcv]

Looks like they use build with release mode:

https://github.com/TechEmpower/FrameworkBenchmarks/blob/mast...

[steveklabnik]

So it's important to not compare master to when the benchmark was posted; remember, they do them at a certain time, then work happens. So like, I sent a PR to update Rust from 1.0 to 1.6 at one point, for example.

That said, I don't think that missing out on --release was the issue here, as far as I know, it has always been on.