Default Problem desire to help people

Sorry for my english not good !!

- I hope someone will help me
- Now I want to speed up activities for g2 lg L22 Isai !! I've deleted all applications and the operating surplus always spend more than 1gb ram
- So what do I do to optimize real clean ???
** And also another problem:
- I want to set the default in performance of cpu + gpu without kernel intervention on whether this really feasible ??
And if you know please guide me thank all of you !!