Are there methods to lower the overhead of a Domino Toppling simulation, short of using a simpler fake physics engine?  eliminating rotation processing of 2 axis may give more predicable behavior. I’ve pondered incorporating a hinged fixture in the base to better control the pivot.

Aside from simply sleeping, can the type of blocks permanently grounded by changed to something with less overhead like a static obstacle rather than dynamic element.

Thanks

I would firstly not assign physics to objects that don’t need them.  Second, I would have all objects not currently active be sleeping.  Finally, once an object comes to rest, I would then mark it as sleeping again.  Combine all three of those should give you very good performance in most situations since you probably won’t actually have tens of thousands of dominoes active at once.