I've had this problem for every game I've done on the iOS.
I've checked to make sure that I'm deleting all the objects I create when not needed, and there's always been around 10-30 objects on the screen. At the start it's fine, but after around 2-3mins it starts lagging.
This is very problematic since I'm doing an endless running game.. would appreciate any help I can get! Is there any sort of memory leak or something that I could be missing besides deleting objects?
EDIT: This is the same on both Mobile web and CocoonJS when hardware accelerated..