Faster at what?
The answer is probably no. Back when Macs used the PPC architecture, they had a distinct advantage in certain kinds of processing, like AV work. Nowadays Macs are held back by in a lot of areas by poorly optimized APIs. Flash is a good example, it runs way slower than it should on a Mac. Adobe just doesn't put much effort into the Mac version.
If a Mac is beating a PC, it's probably because the PC is bogged down by spyware or because it doesn't have enough resources to support Vista bloat.
"The worst part about these reviews is they are [subjective]--and their scores often depend on how drunk you got the media at a Street Fighter event." — Mona Hamilton, Capcom Senior VP of Marketing
*Image indefinitely borrowed from BrainBoxLtd without his consent.