My portable "for fun" rig has Neo Soul Keys Studio 2 and the Hammond B-3X on a 1st gen. iPad Air; it is stable for for basic presets with very, very light f/x. Generally I leave my buffer size at 512 samples or higher, but it is possible to venture down to to 256 without incident. Neo Soul has handled extended playing at 64 samples, though once again, with basic presets and almost no f/x. On this machine, Korg Module Pro can run happily at 64 samples.
To optimize/free up CPU resources I did the following:
- turn OFF Notifications on all apps
- turn ON Do Not Disturb
- turn OFF Siri & Search
- if possible, turn OFF Bluetooth and WIFI
* turning Notifications off makes a most difference on both the Mac and iPad; the Notification scheduler eats up a lot of CPU cycles.