So it looks like there's an performance issue when the camera moves along a tilemap.
FPS is fine untill the camera starts to move. It even happens in phaser examples like this one: http://phaser.io/examples/v2/tilemaps/sci-fly
On my high end PC i dont notice it, but when i tried to run it on my laptop i came across this problem.
It happens in my game aswell. Code: http://pastebin.com/UHvXu6nz
Has anyone an idea why this happens, and how to fix it?