1) Clear the cookies and temp files on your Internet browser.

Click on the ‘Tools’ option in your Browser Menu at the top.
Click on the option ‘Internet Options’
In the 'General' Tab, look for buttons ’Delete Cookies' and 'Delete Files' and click on them.
Click on the ‘Advanced’ Tab and click on ‘Restore Defaults’

2) Look for any resource intensive or bandwidth consuming applications running in the background and close them.

3) Ensure your system meets the minimum or recommended specifications

4) Ensure all your drivers (Graphics,Sound and Network) are updated and the latest version, update them if necessary. For more detailed instructions
5) Scan your system completely for spyware and viruses using the latest and most recently updated spyware/anti-virus.

6) You may require to install an optimizer for your processor