Somewhere I heard that was the case, but I didn't verify it. These benchmarks show Jython performing hundreds of times worse. spectral-norm: 0.12 secs for CPython and 4.96 secs for Jython. How can the JVM be 40 times slower than an interpreter? Maybe they didn't warm up the hotspot compiler (amateur mistake), or the Jython compiler is suboptimal. However I compared the code: This https://pybenchmarks.org/u64q/program.php?test=spectralnorm&... versus this https://pybenchmarks.org/u64q/program.php?test=spectralnorm&...
The py3 version is calling numpy which calls a highly optimized C library. So this benchmark suite is worthless. They failed to warm up the JVM hotspot compiler, and they are comparing interpreted Jython with a highly optimized C library called from Python3
The lack of a warmup phase is confirmed by the raw command line and output logs on various benchmarks. Amateurs. This is a highly misleading set of results on multiple levels.
