RFS Slowdown?

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Does this phone use the same RFS filesystem as the Vibrant? Does it slowdown like the Vibrant did?

I was playing with this phone in the T Mobile store and it seemed much faster than my MT4G and my old Vibrant. Honestly, I really miss the screen. Once you have a S Amoled screen, everything else just looks subpar.

It does indeed use the same file-system as the Vibrant. The 2.2 update does speed the phone up substantially though. Personally, I'm waiting for krylon from Team Whiskey to get his hands on a SGS4G (sometime this week) and then we'll have sick custom roms to choose from that will benefit us greatly!

But does it slowdown like the Vibrant did? The Vibrant would freeze so sometimes I couldn't even answer a phone call or would just would freeze for a minute not allowing me to do anything. I'd have to pull the battery and reboot the phone.