Are you high? Yea a P4 is old but it can still watch youtube videos with ease. There's no waiting either, it starts as soon as you click on the link to the video. And it plays almost all MAME games fine at 100% except for that small group of games that is CPU instensive.
I have a Intel Pentium 4, 3.0 Ghz with Hyper Threading Technology, 800 MHz Front Side Bus....
Which is a big difference between a P4, 2.4 Ghz with no HT technology, and 533 MHz FSB
That aside, I would like to buy a new computer sometime in the near future.