Ditto for me. I had gotten so used to building web backends in Ruby and running at 700MB minimum. When I finally got around to writing a rust backend, it registered in the metrics as 0MB, so I thought for sure the application had crashed.
Turns out the metrics just rounded to the nearest 5MB
And this is why pretty much all commercial software is terrible and runs slower than the equivalent 20 years ago despite incredible advance in hardware.
Another anecdote, the team couldn’t improve concurrency reliably in Python, they rewrote the service in about a month (ten years ago) in Go, everything ran about 20x faster.