The cache-and-optimize-offline strategy that Google Page Speed is using is fraught with problems for dynamic sites. We tried this at first with some CloudFlare optimizations and it was a disaster. We rewrote the system from scratch to do on-the-fly optimization so it works even with dynamic sites. Here's a blog post about it from some time ago:

http://blog.cloudflare.com/an-all-new-and-improved-autominif...