Discord had a pretty famous transition from Go to Rust [0].

[0] https://discord.com/blog/why-discord-is-switching-from-go-to...

They didn't have particularly great reasons to migrate at the time besides the team wanting to write rust. That article is just trying to provide validation

"With the Go implementation, the Read States service was not supporting its product requirements. It was fast most of the time, but every few minutes we saw large latency spikes that were bad for user experience. After investigating, we determined the spikes were due to core Go features: its memory model and garbage collector (GC)."

Eh, I don't think iteration times in Rust are nearly as bad as you think. During a realistic development loop compilation is <1s in most situations thanks to incremental compilation and tests are fast unless you have synthetic slowdowns such as sleeps or IO (which would effect both languages equally).

The entire point of writing rust is that you're trading writing speed for runtime safety. It takes longer to write but you can guarantee you're never going to have a nil pointer panic or race condition.

Unless you're doing something super weird your infra code is gonna be running for way longer than you spend writing it so who cares if it takes an extra 20%/30%/50%/whatever time to write?