Hi Keggles,
I have an Ipad 3, Air, and Air 2.
For the DL1608 I find the 3 to be fine for mixing, though I am not playing at the same time.
Do you have a whole bunch of other apps loaded in memory?
How much free drive space do you have?
Try completely powering off your Ipad and when you re-start it only run the Master Fader app.
Please let us know how it goes.
Good health, Weogo