Not very clear about your problem, could you please correct your English? At least add a bit of punctuation. But i'll give it a go with what i understand. Is your question this? "Will doing face turns affect my speed of solving the F2L? " Cause i do not understand what you mean by
face and face' .
Well actually, there are no "faster" or "slower" algorithms. It doesn't matter if you use "body turns" during algos, if you're not comfortable with them, try rewriting the algos to suit you :)
hope it helped :)