Its interesting. At our site, we put everyone to the test and almost no one saw such a dramatic decrease as is represented in that video. In fact, almost everyone hovered around at least 40FPS. I know it's not 60 like the 2.0.1 Droid is showing, but not bad.
2.1 Update Slowing Down Droids? | Droid Life: A Motorola Droid Blog
2.1 Update Slowing Down Droids? | Droid Life: A Motorola Droid Blog