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Recently I am doing a project, in which I have to set a constant velocity value to a ball. This game is much like PingPong. I am now using P2 physics, but when test it on mobile, there are a big performance problem. On Android, the problem could be a small problem due to different browser, but it still remain somtimes, there is a little bit stutter when I playing. Because I don't have the things like vector, so I can not get or set it's magnetic efficiently, so I have to calculate the angel and value of the velocity and set it to constant values every frame, I think this might be the main problem. And I also want to know, if it's also because the P2 physics caused too much, I know that there are a box2d plugin in phaser, it costs a bit, but I want to know if my game's performance would become better if I change to box2D, what's the difference between box2d and p2. And I also want to know if anyone could have a better solution to due with the constant velocity problem, I need it to bounce, and if it's possible I also want to constraint the angle, because I don't want the ball to bounce like parallel to the bouncing board. Thanks a lot!