As is true about general use of iPads and Fire tablets, you'll have the best play experience if there is ample space on the device to run the open applications. If you experience sluggishness in your games, consider closing other open applications and restarting the Osmo app.
Memory requirements change slightly with every app release, but please note that approximately 200-500 MB is required for each Osmo app.
Please note that some of our more recent games (like the Math Wizard games) can take upwards of 1 GB of space.