I can't recall how many movies I ran on my old 400 MHz laptop . . . never a problem until I downloaded and upgraded the DX that was installed. That killed it. 🙂 But, I restored it, with the laptop's Restore CD.
The video card was the ATI Rage Pro 128 mobile, and I had 64 MB of SDRAM.
But, yes . . . it played movies very well and still does for my youngest son.