Unless you are near a mass of other models (convoy, task force, harbor with planes/ships, etc.) it's likely that it's just reaching the max your processor can handle. I suppose an onboard sound card can contribute a little; while most of your ship sound effects are off in time compression that high, you still have the music and ambient sound playing. Onboard sound cards rely on the CPU to make a lot of the calculations, which leaves somewhat less power available to run the game.
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We, the unwilling, led by the unknowing, are doing the impossible for the ungrateful. We have done so much, for so long, with so little, that we are now qualified to do anything with nothing.
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