http://csswizardry.com/2013/01/front-end-performance-for-web-designers-and-front-end-developers/
CSS, front-end performance optimization
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Minimize DNS lookups
Minimize redirects
Avoid bad requests
Combine external JavaScript
Combine external CSS
Combine images using CSS sprites
Optimize the order of styles and scripts
Avoid document.write
Avoid CSS @import
Prefer asynchronous resources
Parallelize downloads across hostnames
Værktøjer og resourcer til analyse af WordPress.
Zemalf.com – WordPress Speed: How fast is your blog?