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Q. Have the devs done any testing on multi-processor systems, or on Intel's hyperthreaded processors? And what kind of performance improvement have they seen?
A. Multi-processor and hyper-threading systems have both been tested and work, but the performance improvements are relatively small. We've seen around a 5-10% gain and this is mostly due to peripheral code being executed faster rather than the game core benefiting from multiple processors.
Speaking from experience, I think the difficultly of multithreaded code is insignificant compared to the complexity of a game like RTW, it is just another type of optimisation that can be applied to the code, and may be ruled out because of time constraints.