Nope, still have a visible slow refresh when switching channels sometimes. It seems very random (like I could switch between two channels repeatedly and continuesly get it, stop for a bit then do it again and it's gone) and I wonder if it is something to do with Aero perhaps?

In older version (6.35 and below) I usually only got this delay when there was alot of ANSI/Unicode letters in direct display for it to load, but now it's just plain text, sometimes alot sometimes barely any.