Yep, here are some sources to back up the claim that Java performance is pretty okay.

TechEmpower benchmarks: https://www.techempower.com/benchmarks/#section=data-r19&hw=...

Language benchmarks game: https://benchmarksgame-team.pages.debian.net/benchmarksgame/...

And just because i found it pretty interesting, here's a summary of a study that not only measures memory consumption and execution time, but also how much energy certain languages required: https://jaxenter.com/energy-efficient-programming-languages-...