Hello there,
I'm noticing this thread might not be the freshest but I wanted to add this anyway. I have a slightly different problem but it should fit in here. I can play the game without any problems (ingame fps around about 40-60) but at random times, if I do something in the port like go to the modules or exterior tabs the fps drops to 1-6 and stays there permanently after that, even in battle. Restarting WoWs does not help, I have to restart my PC. It's pretty annoying, maybe somebody got a fix for that. Otherwise I might just have to wait for WG to patch it...