Awhile back I researched whether I should keep VR turned off while at high speeds. There seems to be 2 schools of thought about whether or not it can actually hurt rather than help at those speeds. All this physics theory is cited on both sides, but no actual test data..
Got to add some info on this one. First, each lens has it's own VR design that is specific to that lens. If you read Nikon's articles, you will see them say that, so you can not have a rule of thumb for all VR lenses. Basically you have to read the lens manual.
There was a Nikon support thing once (that I can not find on their site - google "nikon VR shooting above 1/500" byThom probably is the most detailed - but I didn't read it. He always is very detailed,) that said to turn off VR when you are above 1/500th. The VR may actually kick in and degrade the image.
Now there is a whole thing on panning (Active mode) that it should/could be used.
Also, Tripod use seems to be different for each lens and is listed in the manuals.
Looon is correct, physics is at play - Nyquest I think is what the term is.
My experience: 70-300VR - above 1/500th Turn off the VR for sure. When people talk about this lens being soft, I'm willing to bet they have the VR on over 1/500th. 70-200vr (ver I) never have noticed any issue above 1/500th except for when it is on a tripod and not panning, then I do see the fuzz come to visit. 24-120vr ver1 - who knows that lens always was soft for me.