Pingdom tested Google, Microsoft, and Edgecast's jQuery CDNs every minute for a couple weeks and found all of them averaged between 100-150ms to download jQuery

Pingdom tested Google, Microsoft, and Edgecast's jQuery CDNs every minute for a couple weeks and found all of them averaged between 100-150ms to download jQuery[1]. Google's was actually the slowest of those, averaging a turtle's pace of ~130ms from all of Pingdom's datacenters. They're all so close that the Google CDN's overwhelming caching advantage should be preferable though. More anecdotally, I've been running a few Pingdom type tests myself for a longer period, using uptime tools on few of my servers and mon.itor.us. Except for that brief outage the morning of May 14, 2009[2], I haven't monitored a net-wide outage or even a 250+ ms slowdown. I'd be genuinely interested in any concrete data to the contrary. [1] http://royal.pingdom.com/2010/05/11/cdn-performance-downloading-jquery-from-google-microsoft-and-edgecast-cdns/ http://royal.pingdom.com/2010/05/11/cdn-performance-download... [2] http://www.zdnet.com/blog/btl/cloudy-day-google-falters-packets-lost-in-key-cities/18064 http://www.zdnet.com/blog/btl/cloudy-day-google-falters-pack...