Known iPad 2 issues?

Hello,

I work at an IT-department and we want to test Prezi together with iPads. One of my users has reported performance issues with his iPad 2 (which he bought when it was new on the market). He experienced lag in the animations and so on.

I would like to know if this is, or was, a known issue or if he just was unlucky?

Regards and thanks in advance,
Erik