First make sure to have the latest version of iOS installed.
The first iPad Mini is a bit slow, so you should have all graphics settings at the lowest option. The “show aircraft count live” should be set to low.
Keep at least 1gb of free unused device memory storage, it can help. :)
Restart the device often, and keep background apps closed.
Live will take more of the devices resources, so in areas where there’s traffic online the device might slow things down here or there.