The theory as to the device's speed is the presence of a dual-core ARM chip - the first to be used in an Android handset. Most likely Qualcomm's dual-core 1.2GHz Snapdragon processor, the presence of two physical processing cores would explain the extremely high benchmark scores.
It's 3 times quicker than the Evo, I hope these are the size of the Streak

More here - Are we still allowed to link to Bit-Tech, I've been doing it for years but they've started advertising heavily this year ?
MW