I've seen this issue reported several times. At first it sounded odd, but then it happened to me. I hadn't seen Truk mentioned in previous posts, though.
I've had a few patrols that took me to Truk, and once I get close, the game bogs down. Running at no or low time compression, up to 64x, the game runs perfectly fine, with no noticeable drop in frame rate. Once I hit 128x, the frame rate halves. 256x, half again. Running at a frame rate of 1 at 1024x back to Pearl is a pain. Save the game, exit, make sure nothing is running in the background, restart, load the game and still have the issue.
Get back to Pearl, end patrol, start a new one without exiting the game, and the game runs fine. Load a previous save, the game runs fine. Running 4096x time compression with no issues. Go sailing around, near ports, sinking ships, and no problem. Get near Truk, and boom! Any time compression above 64x drops the frame rate into single digits.
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