The SiO2 bullet integration is setup to run 100% on the simulation thread… which can be whatever frequency you like and is separate from the render thread.
You do have to use an entity system, though.
It’s not documented but there is a demo. You can see some posts about it in this thread:
The demo code is here:
I’m using it for the Spacebugs demo game which will eventually be open sourced as well.