[antonymoose]

While I’ve worked in HFT and understand the sentiment, I can’t recall any open-source project I’ve used coming out with performance guarantees. Most use license language setting no guarantee or warranty. Are there notable projects that do include this consideration as their core mission?

[dvratil]

I believe every sensible open-source developer strives to keep their software performant. To me, a performance regression is a bug like any other and I got and fix it. Sure, there's no warranty guaranteed in the license, yet no-one who takes their project even a little seriously takes it as "I can break this any way I want".