Cmon guys, 130 views and still no replies. Here is the cpu usage when watching a video on youtube:
(On firefox)
System Idle Usage - 60-80
firefox.exe - 20-40

(On IE7)
System Idle Usage - 70 - 80
iexplorer.exe - 20-30

All the rest of the processes fluctuating btw 0 & 3

System Specs:
Windows XP Media Center Edition
Version 2002, Service Pack 2
Pentium(R) 4 CPU 3.06 GHz
2.63 GB Ram
Master Hard Drive - 80GB
Slave Hard Drive - 300 GB
Video Diver - ATI Radeon (256MB)
Audio Driver- Realtek HD Audio


Here is the data from the performance monitor:
Totals
Handles - 11229
Threads - 510
Processes - 40

Commit Charge (K)
Total - 453628
Limit - 3908356
Peak - 456888

Physical Memory (K)
Total - 2030956
Available - 1368840
System Cache - 581484

Kernel Memory (K)
Total - 60580
Paged - 43736
Nonpaged - 13844

Processes - 40
CPU Usage - 89%
Commit Charge (PF Usage) - 442M/3816M)

Windows open - Mozilla Firefox & Task Manager.