How to remove render-blocking javascript and optimize css in above the fold content?

[Dave]

Originally Posted by Max Taxable

Those don't optimize anything and also add a significant amount of first byte time. They just try to load cached static content from a location closer to the user than the host is. If that content is fat, it will still be fat when it's delivered through a CDN.

To the OP: I don't use or recommend Google PageSpeed. Try http://webpagetest.org instead.

Well, I consider minifying of CSS/JS files and the HTML output as optimizing.
When I disable Cloudflare on my forum it loads slower than when it's enabled.

If OP wants another tip, optimize all of your images with https://kraken.io/web-interface (choose lossless unless you don't mind losing a bit of quality)