Default HTC Sensation Xe

Hi Guys

Bought a HTC sensation xe recently everything was fine after unboxing beats audio software, lock screen look just like on the picture on the box, 1.5ghz processor and gingerbred and all. After i took the first update ICS im now seeing my processor reading 1.2ghz instead of 1.5ghz how do i fix this and is it normal? It looks fine and everything just the processing speed change im asking about