Repeatedly request URLS from CDNs and give an idea of responsiveness.
Repeatedly requests the jQuery 2.1.4 js file (minified) from a CDN for a period of time to give an idea of responsiveness.
It's not a perfect metric but the results may or may not confirm those generated by similar services.
Usage:
python cdns.py [microsoft|google|cdnjs|jquery] (duration in seconds)