Hmm, is rails really comparable to anything that's precompiled (genuine question, I don't mean this dismissively). What I really meant was, as a backend engine

Hmm, is rails really comparable to anything that's precompiled (genuine question, I don't mean this dismissively). What I really meant was, as a backend engineer, I frequently deal with optimizations on too many object allocations and long running/too frequent GC cycles even without immutability built into the language. On the Rust front, the problem is in small memory allocations, fragmented memory and then more calls to kernel to alloc.