I have never heard that shooting at a higher shutter speed avoids motion artifacts. If that's what you lab told you, then it's best to follow their instruction.thats something I have considered and am doing. I have heard shooting at higher shutter speeds to avoid motion artifacts that occur due to HDV compression, shooting at -3DB to reduce electronic noise etc and stuff like that. Anyone had any problems on Sound recorded on the camera? is it advisable to record audio separately?
Shoot at Higher Shutter Speed if You're Panning A Lot
Shoot higher shutter speeds than 50/60 if you intend on making fast pans or tilts. The MPEG compression format does not lend itself well to high speed pans or tilts with lower shutter speeds. Practice shooting with slower shutter speeds for the beautiful effects this can provide if you know in advance what you’re looking for.