First of all install Easy Cpu control and set the governor to performance and io scheduler to deadline, this way your cpu will maintaine it`s speed at 800mhz but it will not drain the battery any faster than usual. Lowest speed should still be 200mhZ.
Enable developer options, a then disable all animations, they will be set to 1x speed, just click on that and choose no animations.
And lastly enable 2d forced rendering.
Hope it helps you. I have zero lag on JB.