This CPU does slow down as it gets hot. But I didn't read where you cleaned the heatsinks or if over 2 years old, replaced the heatsink compounds.
More reading at http://forums.cnet.com/7723-6122_102-569818/getting-ready-to/?tag=contentBody;threadListing
After watching youtube with Firefox my computer is slow in every operation! Just opening My Computer or booting takes a lot more time.
OS Version: Microsoft Windows XP Professional, Service Pack 3, 32 bit
Processor: Intel(R) Core(TM)2 Duo CPU P8600 @ 2.40GHz, x86 Family 6 Model 23 Stepping 10
Processor Count: 2
RAM: 1999 Mb
Graphics Card: Mobile Intel(R) 4 Series Express Chipset Family, 1024 Mb
Hard Drives: C: Total - 80003 MB, Free - 72494 MB; D: Total - 72614 MB, Free - 49592 MB; F: Total - 953867 MB, Free - 240 MB;
Motherboard: Dell Inc., 0G866N
Antivirus: AVG Anti-Virus Free Edition 2013, Updated: Yes, On-Demand Scanner: Enabled
This is some of what I`ve tried:
1. System restore
2. Formated the computer and installed a fresh XP
3. I didn`t install adobe flash player. (It seems like I had activex flash thou)
4. Cleaned the registry with "Vit Registry Fix 11"
5. Deleted temporary internet files in Firefox 18
I formated the computer 2 times and even after a fresh install the computer went slow after watching youtube for some minutes. Before formatting I thought the problems was because of Flash Player so I didn`t install it in the fresh XP install.
I suspect it has something with my video card (Intel GM45 Graphics). It didn`t show up in either dxdiag or CPU-Z before I installed the driver. Under Graphics Driver, Intel® Driver Update Utility says "Your driver is current". Under Intel Chipset Software Installation Utility (Chipset INF) it says "This version is valid. Does it mean I have the correct drivers?