Yeah, I got the same problem, especially with videos downloaded with Cutetube.(with option to download videos in 480p quality) At first it was funny, then it went very annoying. I also use it without drop frames option, but now when I watch films I always overclock my phone because in result video is more smoother than without overclock.(I download film right into my nokia and then I straight watch it without conversion, standard .avi file that fit on one CD is more than enough for n900's resolution and looks very good on it) With full-length films I experienced that video was rather choppy than slowering video down.