why not push them to a CDN ? and you could extract the inline images from the css and combine all of them into a sprite
BTW, I meant the PageSpeed Service for GAE [1], which seems like it's basically CloudFlare running mod_pagespeed on all requests.
[1] https://developers.google.com/appengine/docs/adminconsole/pe...
My main use case was a CDN, as I'm not sure if Google pushes the GAE files to various locations.
GAE edge caching is poorly documented, here's what I've found so far:
[1] https://groups.google.com/forum/#!topic/google-appengine/6xA...
[2] https://code.google.com/p/googleappengine/issues/detail?id=2...
[3] https://groups.google.com/forum/#!msg/google-appengine/8QgEU...
[4] https://groups.google.com/d/msg/google-appengine/8QgEUBOiNFw...