How to reproduce:

1. Open attached project
2. Open scene test.unity
3. Open the Profiler window
4. Play the scene
- Note how the frame time in Physics increases while the object "anim_grp" is moving
- When it stops moving, the frame time also resets

- Reproduced with 5.6.0b2 (5d236ef0678a), 2017.1.0f1 (4d7fe18a2f34)
- Not reproducible with 5.6.0b1 (d37b23d9dfff), 2017.2.0a4 (fefbe8dde68f), 5.4.3p1 (00292ff31167), 5.5.4p1 (ef963c7eb035)

There was a bug prior to 5.6 where animated object's physics was not applied properly. This bug is fixed in 5.6 and now object are not teleported anymore.

However in this case, as explained by Anthony Yakovlev

-> to me it seems that there was a lag introduced (possibly by writing to physx more often), and then we ended the famous physics spiral of death where we have to call multiple physics simulations per frame to catch up with the wallclock time
-> in the upper screenshot they have physics.processing invoked 7 times

The good news is that in 2017.2 the issue disappears because of the way physics is handled. Unfortunately we cannot backport those changes.