Install "oclockvitaminimal" (defaults to 444mhz), its a "Non-Kernal Plugin" ................ Install also "Lolicon" and set it to 111 or 222mhz setting, its a "Kernal Plugin".
Because they are not the same kind of plugin they can both work at the same time!
(Lolicon will crash on most games after about 2 hours of play, this really (fixes), should remedy that, in addition to a noticable speed boost)
(the VITA will limit its speed to 494mhz in most cases, in this case also, but you can really get up to 800mhz of overclock)
(G00G.E WAS RIGHT!)
(games like call of duty on the vita, always overclock the system, thats how multiplayer is achieved with out a lot of lag, so its like playing two full games at 444hmz at the same time, so going up to about 800mhz, is something sony allows for developers, we just have really begun to unlock the true potential of the vita)