[vips7L]

> Java optimization is a specialized experts job

No its not. Modern Java GC's require 0 tuning. ZGC with default settings can achieve submillisecond pauses.

> and as i said D has a very small community Java is on the opposite side of this spectrum its immensely popular, and as I understand it took Java several iteration, and tons of resources before gaining good performance

This wasn't your argument. You stated that mutability was the reason that D couldn't have a good GC, not the size of its community or resources. According to tiobe D is more popular than OCaml as well.