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For timing I'm just running the *nix command "time ./robocode.sh -nodisplay -battle battles/diamond.battle". For Robocode startup time (including JVM startup but not just that), I'm just roughly estimating by watching the command line output.

Here's some fun... I tried using my motherboard's "automatic overclocking" functionality where it autonomously tries to see how high it can clock things, and it decided it could get it up from 3.2GHz to 4.2GHz (+30%). Both Windows and Linux booted fine, so initially I thought it was stable, and it ran one robocode battle at a time fine, but as soon as I tried to run multiple in parallel, the JVM kept crashing and it became apparent that the +30% overclock was not stable despite OSs booting fine. Interesting thing was, the +30% overclocking seemed fine thermally even with the stock cooler, it just had other stability issues.

I'm now running a more modest +12.5% CPU overclock, and I got the Diamond versus Diamond runs down to 12.837 seconds-per-battle, running 6 in parallel. This is still with memory running at 1600MHz, so I guess what I was hitting before wasn't purely a memory bottleneck anyway. Also, huh, 22.5% increase from a 12.5% CPU overclock...