Hi you can follow the below steps to increase your internet speed
1)If your system internet speed is very slow. 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.