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I've had to deal with this quite a bit when writing games in c#. Similar to Java the GC can case obvious stalls. The easiest way is to stop calling the "new" function at run time by using pooling. For instance at the start of a match, or a round create a container object which contains N pooled objects which you know you create often, eg wave objects. At the point you wish to use one, take it from the pool, initialise it, use it, then return it to the pool when finished at any point later on.

Because you have not called new, and then nulled the object, the memory used does not go up, it stays constant, thus no GC is run. It's obviously impractical to pool everything so you just do the worst offenders which are things that you create often and throw away.

That seems like a great approach. And you can even create the pools in a static block, which I'm pretty sure runs before the match starts and won't count against any of your CPU time.

Speaking of static blocks, I've noticed that they get run on Robocode/rumble startup for every single bot, which is partly why it takes so long to start when there are lots of bots in the /robocode/robots directory. I also suspect that code in static blocks isn't subject to the security manager, since it can print to the main console. Does somebody feel like writing a test bot to see if this theory is correct?