Choosing between worst in class

As I’m trying to improve the performance of the mit 100k website/server delivery, I find myself comparing the performance of different cdn’s and hosting plans. They all have tips on how to use CDNs to cache your content all over the world, which is good, but with average response times of 400ms after cdn-caching [1][2][3], I can’t help but think that we’re comparing worst-in-class performance. CDNs are supposed to be great, so why the sub 50 requests/sec average after caching?
Interestingly, I’m not sure how I got on this team. I basically saw some free food in a random room and then followed it in… No really, I had no idea at all.