Possible Duplicate:
Is 'low speed' finally proving its merit?

Recently in a mayor presentation of upcoming product I saw slide talking about "faster performance". Then in BBC article covering same event, they wrote about "faster speed".

Are these phrases considered correct in English? I'm coming from a language, where that would be considered pleonasm, and the only correct way is to say "better performance" and "higher speed". Is that not the case in English?

Quick look at nGrams suggest that indeed "fast speed" and "fast performance" aren't used often.