[ODE] Stability problems

[gl]

> Is there a problem with setting a fixed timestep at program startup based
> on the detected CPU speed?

If your app behaves OK with all the likely values, then no, but the results
will be different.  For example, using a larger step will mean that things
interpenetrate more.  Try stacking some boxes with different timesteps - you
should see them gradually sink into each other at rest as the steps get
larger.  If those differences are OK for your app, you're fine.
--
gl