Have you tried to install Harbour Traffic Lite mod supplied with IuB?
Have you tried to decrease the particules settings in the Options?
If yes, well here's a line originaly given by oRGy took from the documentations:
Quote:
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Performance: As Improved U-Boat includes multiple higher-resolution textures, as well as a greatly expanded view distance, performance (framerate) will be degraded on less powerful computers, and loading time will be increased. If you have to turn on the lowres texture option or put up with low (5-15) fps in default SH3, then you should probably not install Improved U-Boat.
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Hope it helps
JonZ