If you are in slow speed connection plan,try to upgrade to latest plan.To upgrade,you can contact your internet service provider.
To increase internet downloading speed,you can use the following manual steps:
1)Install latest browsers like Opera,Google Chrome,or Mozilla Firefox latest versions.
2)Use Mozilla Firefox browser.
3)Avoid using flash and watching online videos while downloading.It may affect the speed and your internet downloading speed may get very slow.
4)You can use Anti-Virus ,internet security protection to protect the pc from malwares and viruses.
5)Clear cache and delete cookies after using the browser.
6)Reset the modem and router daily once or whenever your internet speed will get slow.
To check the internet downloading speed and uploading speed i would suggest the site Scanmyspeed.com .