Kyle, amazing post! You mentioned that the 60% speed increase led to a 14% donation increase. You used webpagetest.org to measure the 60% speed increase. How did you measure the donation increase? Is there some sort of A/B tool for CDNs to help quantify the impact of speed improvements on CR?
We used Optimizely (https://www.optimizely.com/) to conduct most of our a/b testing. Optimizely works on the client level (browser), not the server level (CDN).
Optimizely is the best a/b testing software I've ever used. It's flexible and easy to use. I suggest you check it out.
