All websites run drastically slow on my computer. Is it motherboard problem

There may be various cause for it. The problem may be with the motherboard or ram or hard disk. It cannot be concluded without analyzing your system.
Anyway, try with some of the basic tips for faster and better internet connection,
* Check the Start up programs and remove the unwanted
* Maintain a Decent Space limit at Hard drive
* Check for Malware, Spyware and bots
* Clear cookies and temporary history files
* Close unwanted background tasks if any
* Reset the modem
* Check the wirings
* Browse with latest and updated browser
* Download using torrents
* Upgrade your hardware
Following these steps may fetch you a better result. You can see the difference in your connection speed by having a speed test before and after performing these steps. You can have speed test for free from
ScanmySpeed.com You will definitely see the difference.

Lack of RAM