At 1:30 PM PST on 2 March, 2010 we flipped the switch and started serving www.active.com through Akamai. We then watched our average load time and bandwidth consumption stats decrease as the DNS change propogated across the world. The end result has been significant. Below are just some of the improvements we've noticed.
Active.com homepage load time reduced from 6 seconds to less than 1 second
Community homepage load time reduced to an average of 2 seconds
Datacenter bandwidth consumption reduced by at least 30%
Concurrent sessions on our webservers reduced by 45%