You an easily enable CDN in Magento by following these instructions:
- In Magento control panel, go to Admin > Configuration > Web > Unsecure.
- Update the following with CDN addresses:
- CDN URL(eg, cdn.magento.com):
- Base Media URL: cdn.yourmagento.com/media/
- Base Skin URL: cdn.yourmagento.com/skin/
Check your sites source code that is uses CDN.
Picture links should be replaced with CDN URL addresses.