I can't find any benchmarks of PyPy vs OpenJDK or GraalVM, but unless I'm mistaken it's still more than 100% difference, and maybe much, much more for pure-Python vs. Java.
Here ya go. On these sometimes one is faster, sometimes the other. https://github.com/kostya/jit-benchmarks/blob/master/README....
Personally i don’t like such comparisons. Benchmarking is hard and far from objective. Much of what makes python popular is the developer experience. Generic benchmarks will only give a rough guide about what to expect in your application. If you are in a niche like the OP, you will have to figure out how to handle your bottlenecks.