It varies. Each rom has its strengths and each phone is different. Some say ICS is the smoothest their phone has ever been while others (myself included) think their phones performed better on older roms like froyo or gingerbread.
There's no right answer to your question and rather than take someones word for it, it'd be wiser to flash several different ones and test it yourself.
Thank you for your support! Do y'all think y'all could put the links to those ROMS?!?
Sent from my LG-VM670 using Android Central Forums
Look in the Optimus V rooting and rom section for all the rom threads. There is a link in my signature (which can't be seen from tapatalk/AC forums app, use your browser) to bumblebee and the rest are easy to find in the Rom sub section of this forum.
I was going to just try it first, but I don't have any complaints to motivate me to flash another. Its very smooth. I only had one stability issue, and it was just because I maxed the overclock. I turned it down, and everything's gravy. Everything works, except I can't play bad piggies. Lol.