Quote from treadigraph:
It seemed to be moving more slowly than I recall from when last I saw it in 2007, presmably a sympton of advanced brain-fade rather than a higher orbit making any significant difference to the time taken to circumnavigate the earth.
Err... Given that the orbital speed reduction is presumably negligible, surely the greater altitude would itself make it appear slower? (Think of high-flying aircraft.) It will become visible above your horizon at a greater distance; be visible longer, and therefore seem to be slower. Your recall is correct, methinks.