We did java 8 vs java 11 a few years ago: https://www.optaplanner.org/blog/2019/01/17/HowMuchFasterIsJava11.html https://www.optaplanner.org/blog/2019/01/17/H

We did java 8 vs java 11 a few years ago: https://www.optaplanner.org/blog/2019/01/17/HowMuchFasterIsJava11.html https://www.optaplanner.org/blog/2019/01/17/HowMuchFasterIsJ... TLDR: using the same GC (*), it's 4% to 16% faster (depending on the GC). But be warned that if you don't set a GC, Java 8 uses Parallel GC (high throughput, so faster) by default and Java 11 uses G1 GC (low latency, so less hickups) by default.