Try using the SH Commander Mod.
As well as allowing you do to a number of different things to the game options (change fatigue settings, patrol grids, crew, etc), you can change the maximum time compression values for different in-game scenarios (close to land, being hunted, with enemy spotted, etc).
Change the "close to land" value up from 8 to something like 32 or 64.
I use 64tc, and am out of Lorient within a minute.
Just be sure you plot your route carefully so you don't run into anything.
If it's due to CPU slow-down from all the port activity, try the Lite-Harbour traffic setting for GWX.
If you are running the stock game, be sure to use the free look button to go outside your sub and rotate the view 360 degrees a few times. It should run smooth afterwards.
Hope this takes care of it.
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