Is it a good idea to use turbo boost?
As I say time and time again, this game is as optimized as it can get without changing direct x or to a different engine which are both too extreme at this point in time for them. Turbo boost is a neat little bonus feature of the i7 and i5. I don’t know why you wouldn’t want to use it. And if you’re using a laptop, turbo boost is the only kind of speed boost you’ll get unless you have a fancytop with an Extreme Edition or other ones that are at the most 4 steps below the Extreme and they may or may not have the ability to overclock. Turbo boost is definitely useful for this game.
More clock speed the better but Turbo Boost only adds 10% or so max.
RIP City of Heroes
I personally avoid any form of turbo and just overclock it to the highest I can get it on a stable temperature.