PS3 disc spin-up

[JAGUAR1977]

Is there a particular reason why different games and strangely, movies, spin-up differently when inserted?

I can understand games using more or less info from the disc, but why should it happen with movies, does each studio format/produce their discs differently?

For example the latest Role Models Blu-ray and Halloween (new one) spin up really fast initially, before settling down, whereas the American Gangster and Death Race disc's don't spin up noticeably.