Nearly every RoR success story has been in spite of Ruby’s performance itself. AirBnB, Twitter, Soundcloud — they all ditched it as soon as they couldn’t bear the technical debt any longer.

Yeah, I know ruby is slow but is it “dominates over architecture and software design”-slow?

It is 6x slower than Java, Scala, Rust etc.

https://www.techempower.com/benchmarks/#section=data-r21&tes...

Architecture and design matters but having an inherently fast language helps too.