So a few of you are rightly confused after my recent commits Let me explain what's going on with the physics systems inside Phaser ...   As you may know, I've been really happy with p2.js for all of Phasers proper full-body physics requirements. It's excellent and I'm really pleased with how well it integrated. However on mobile it doesn't take long before the frame rate starts to dive. This is no fault of p2, it's having to do a lot of heavy lifting math and mobiles just struggle. Even with ju