Rega tables have optional PSUs fairly down their product line and they are standard on their top 3 models I believe. The PSUs plug into a wall wart. A rudimentary speed measurement (with an iPhone on the platter) showed RPMs of 33.28 and 44.98 (.15% and .044%). I suspect with that weight removed it would speed up a tiny bit, but I would challenge anyone to detect the difference.
I put a LPS into my phono stage and it probably made a difference statistically, but I couldn't hear it, but it wasn't an A-B comparison. That would be really tough to do. The manufacturer told me if it was his brother in law, he would tell him to do it. He didn't mention if he liked his brother in law :-)