Four times the number of pixels to draw/move
Where is 9 times coming from? IIRC the iPad 3 has twice the RAM (512 v 1024), essentially the same CPU and a GPU with twice the number of cores (dual v quad).
Also note that when PPI doubles from non-retina to retina a game now has four time as many pixels to draw or move. There may be bottlenecks between GPU cores and the memory or display that manifest more readily when the workload quadruples.
If a game was only using a fraction of the capability of an iPad 2 then going to an iPad 3 would probably be no problem. But if the game was pushing an iPad 2 hard then going to an iPad 3 may very well offer some problems.
The A5X in the iPad 3 had over 9 times better graphics than that in the [iPad] 2.
Where is 9 times coming from? IIRC the iPad 3 has twice the RAM (512 v 1024), essentially the same CPU and a GPU with twice the number of cores (dual v quad).
Also note that when PPI doubles from non-retina to retina a game now has four time as many pixels to draw or move. There may be bottlenecks between GPU cores and the memory or display that manifest more readily when the workload quadruples.
If a game was only using a fraction of the capability of an iPad 2 then going to an iPad 3 would probably be no problem. But if the game was pushing an iPad 2 hard then going to an iPad 3 may very well offer some problems.