Hi you can follow the below steps to increase your internet download speed
1)If your system internet speed is very slow. First reset your modem
2)Delete all cookies and temporary files.
and flash video ,so the webpages is loaded very slow.So you can try it
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 .
5)You can try to close unwanted applications
Finally go to this site Scanmyspeed.com then check your internet speed
it will definitely works very fast.