I mostly do dsp and control software, so number heavy. I am excited at the prospect of anything that might get me a performance boost. I tried porting a few smaller tests to java and got it to c2 some stuff, but I couldn't get it to autovectorize anything without making massive (and unintuitive) changes to the data structures. So it was still roughly 3x slower than the original in rust. I'll be trying it again though when Valhalla hits, so thanks for the heads up.
Although there's no doubt that the lack of flattened object is the last remaining real performance issue for Java vs. a lower-level language, and it specifically impacts programs of the kind you're writing. Valhalla will take care of that.
