I did a search and couldnt find one post about slow fps during battles. So what to do about it, I tried reducing some of the settings and they didnt seem to affect the slow fps during the battle at all. Surely I dont have to play this whole flipping game on low settings? That would be unacceptable to me.
Can you give some FPS numbers? In large fleet battles you're obviously not going to be able to keep 60 FPS, no matter how good your computer is.
I don't know much about your particular processor, but since Sins is not multicore CPUs that have several lowish quality cores will not handle Sins very well. On my rig the CPU is the main bottleneck, and the only real things you can do is to give Sins high priority or even an entire core to itself, and disabling things like trade ship icons and stack/remove things from your Empire tree (basically anything to reduce the amount of objects the game has to display). Also try to avoid building fleets that rely on strikecraft, they tend to take the most CPU resources when you get thousands of the flying around.