problem w/DVD movies in Linux

I'm running SuSE 7.2 Personal, Nvidia TNT2 M64 with Nvidia's hardware drivers and a 1.7GHZ P4 with an IDE 16x DVD-ROM drive from Pioneer. Despite all of that hardware, which makes the "gear" benchmark and other programs scream, when I run Ogle to view an encrypted DVD movie (yes I got it legally, from a video rental place - no flames please.) it playes very jerkily. Xine wouldn't play it at all; I assume because of encryption. A WinXP program that playes DVDs manages to play it perfectly well. How do I tweak SuSE / get a better program / whatever in order for DVDs to play?