The main factors that influence your service speed are:
1) Your network interface card (NIC) is older and slower hardware.
2)An incorrectly configured firewall
3)A shared connection with other users on a local network
4)The use of a wireless modem or router
5)You might have spyware/malware infecting your machine, and secretly
using your Internet bandwidth
Here i mentioned some of the tips to increase your internet speed
1)First reset your modem
2)Delete all cookies and temporary files.
3)Use different browser. Because normally some browser enabled java
script and flash video ,so the webpages is loaded very slow.So you can
try it different browser.
4)Virus,malwares is also another important thing it will make a slow
connection.So use a good antivirus software to remove all virus and
malwares .
Finally go to this site Scanmyspeed.com then check your internet speed
it will definitely works very fast