Burialfaith,
Within that information I received what I was after. You are on a first generation Ipad Air Silver. That iPad only has 1GB RAM, and while it can technically play the game, we expect it to have poor performance in some cases, especially those which put more cards and effects on the board. It is possible when we fix the problem with players crashing on 2GB/3GB RAM devices, your problem will improve.
However, given the age of that device, I expect that you will continue to have this issue until the device becomes unsupported with future patches and new content and no longer launches the game. Your best bet to fully avoid this lag would be to upgrade to a more recent device.