Comment on WordPress SEO Plugin Options by Mark.

WordPress SEO Plugin Options Dave,

Each WP is different. In theory just using your theme should give top results.

However, things like Wavatars and like/share buttons (ie external files) etc the speed test results with my site are good but a few “F” ratings. I notice your site has only top ratings.

I have tried. fastest cache, w3 total cache, speed booster pack, autoptize and wp performance score booster plugins and have got incremental improvements with each one on.
Is there anything else you generally recommend or any other plugin?

Almost not matter what I do (via plugins) this comes up:
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Leverage browser caching
Enable compression
Optimize images
Minify JavaScript
Minify HTML

Any additional ideas?