Fglrx without "no backfill" = no garbage but slow maximization
Fglrx with "no backfill" = garbage for a split second but fast maximization
Nvidia without "no backfill" = garbage for a split secont but fast maximization
I see behavior this on both a Quadro NVS135M (190.xx drivers) and a 9500GT (185.xx drivers). Obviously, I cannot be 100% certain, but it seems that nvidia drivers have some kind of hack for the slow maximization issue.