I hear what you are saying about so damn fast. I have been watching some 2003- 2004 races on you tube then switch over to some current races and you will be able to notice the foopers are moving much faster. That or the AMA is playing camera tricks and speeding the action up.
No they aren't speeding up the footage, but they are taking all the sharp edges off everything on the tracks and making them MUCH Dumber, More Gently Inclined, and Softer...
4 Strokes are so boring as they go around the track that interest in motocross and supercross in general has been fading. That's what happens when a change to inferior technology is written into a sport's pro contracts (Every Single One Of Them Starting From January 2006), and the series is desperate to try anything to spice up the flow of the action a little... The latest tactic is to Dumb the terrain down enough so that even lumpy, dumpy Foopers can appear to go fast. In the past, before the tracks were brought down in amplitude to help buttress the failing Fooper, they looked completely rediculous as they flopped and farted around... floundering even though they had their huge handicap in place through the Gay-M-A... and related inhbitants of Brokeback Mountain like Mowercross's MXSpharts and Foopercross's Fold Motorpharts.
Problem is, any terrain that a Dumpster can traverse, a 2 stroke racebike can cut through like butter. If the two bike types were on the track at the same time, the 250 2 strokes would make a joke out of the 4 Foopties just like they always did before every single paying contract handed out to pro racers was writen to demand that they ride Fart Bikes.
It's just another case of Turds rolled in glitter.