Q:

Google app engine slow TTFB

I started looking at using Google app engine as CDN, but their TTFB is very poor.  Can I do anything to reduce the response time of static content? 
Web Page Performance Test from Dulles
Web Page Performance Test from Amsterdam

A:

Google app engine isn't designed to be a CDN, it's a platform for you to build webapps on.   If you're looking for a cheap CDN in app engine, I suggest you use something else.