Adreno 220

[VIRGIN KLM]

I'm pretty possitive that in order to install CM 10.1 on that device you need to flash a costum kernel. Check which kernel it is and what features it has. Normaly speaking, in CM based ROMs, there is a native overclocking setting in Settings-> CM Settings, You can change the governor and the MIN/MAX frequency caps. Try to not overdo it, if you're not sure what you're doing then don't do it. Wrong use of those settings could mean entering a sleep of death on your device or frying it. Read people's reports before doing anything. What also proved to be useful is checking devices with exactly the same chipset and which one of them has the highest stock clock. For example i have HTC EVO 3D whoch has exactly the same chipset with HTC One S. Even though their internals are exactly the same HTC One S is stock clocked on a higher frequency than HTC EVO 3D, which means that if you change the clock of your EVO 3D to One S's stock clock it's safe to assume that you are 100% safe since HTC wouldn't do anything stupid and that more or less proves that your device was underclocked by default for stupid reasons. One small thing also that I forgot to say is that, AOKP/AOSP roms tend to be 10%+ faster than Sense based roms. If you have a device like HTC Sensation which Sense is not really a vital part for the device (like it is for HTC EVO 3D, because without sense 3D doesn't work) don't even think of it a second time to use an as bugfree as possible AOKP/AOSP ROM instead of a Sense ROM. Also HTC Sensation has 4.2.2 AOSP/AOKP ROMs which is the best thing that can happen to it currently.