DU Speed Booster or 360 sec better?

[Slash GeaR]

I just want to know a few things:

Which cleans better?
Which consumes more ram?
Which is faster?
In DU it asks me whether to scan SD card whereas 360 sec doesn't.So does that mean it doesn't scan my SD card?
Is the game booster really useful?

Thanks a lot!

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[Slash GeaR]

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