Lots of things will affect the computers speed, first check your line speed using a speed checker click here You need to do this several times over the time you want to use your computer for a few days. Also if you are using the wireless connection try it with a LAN cable to see if this improves the speed. Are you on cable or phone connection? Contention is not usually a problem with cable. I found my computer speeded up when I changed to a different anti-virus.