That's probably it. I found a weird Java version of the benchmark here: https://github.com/newspeaklanguage/benchmarks/blob/master/Splay.java https://github.co

That's probably it. I found a weird Java version of the benchmark here: https://github.com/newspeaklanguage/benchmarks/blob/master/Splay.java https://github.com/newspeaklanguage/benchmarks/blob/master/S... At least for some parameters, non-generational Shenandoah is faster than generational G1 (both overall run time and time spent in the benchmark phase, and overall CPU usage). But I expect it's possible to get wildly varying benchmark behavior depending on the parameter choices (the defaults are of course much too low).