You can try Taktiks OneShotIdle class:
http://www.renoise.c…335#entry251335
You can also study the “nibbles” game from Conner which is using the app_idle_observable in practice so you can see how it is being used.
Basically the idle_notifier calls a function every once in 0.1 seconds.
You can use that routine to do the processing of one task each 0.1 seconds or to break for a moment from it every 0.1 seconds.
(The latter speeds up things a lot)