Where oh where is IronPython? I'ts been almost 3 months since we were all baited by Jim Hugunin. In the meantime, I conducted a quick experiment using J# to compile a .NET pystone against Jython. These stats are just for fun, I don't expect they are indicitive of anything but a minimum level of performance. J#ython (CLR) Pystone(1.1) time for 10000 passes = 1.883 This machine benchmarks at 5310.67 pystones/second Jython (JVM v1.4.0) Pystone(1.1) time for 50000 passes = 3.986 This machine benchmarks at 12543.9 pystones/second Python 2.3 Pystone(1.1) time for 50000 passes = 2.36015 This machine benchmarks at 21185.1 pystones/second