If your framerate is struggling, do you use D3D antilag? It'll help a lot if you don't:
http://www.subsim.com/radioroom/down...o=file&id=2871
Flickering textures sounds like you're using Magnum Opus - the texture flickering is a result of the free-camera mod included in that (or you could be using the Free Cam Tweak on its own). The only way to prevent it occurring is to revert back to the default cameras.cams file. More info (and the default cam file) can be found here:
http://www.subsim.com/radioroom/show...postcount=1644
As for the stuttering... it depends. If you're not using Antilag then that might solve it. If you're using FX Update, and you get the stutter when you attack ships, it could be the emergency flares that some ships fire off when attacked. You can edit the zones.cfg file to remove them - I did it to reduce the stutter as well. More info & instructions here:
http://www.subsim.com/radioroom/show...&postcount=747
If the seabed/waves/environment is ugly, get Dynamic Environment:
http://www.subsim.com/radioroom/showthread.php?t=182377
