I recently rebuilt the theme of my moderately-well-known WordPress-based site to use all vector graphics for the site UI. Further, I implemented SVG sprites so

I recently rebuilt the theme of my moderately-well-known WordPress-based site to use all vector graphics for the site UI. Further, I implemented SVG sprites so all relevant SVGs are embedded in the main HTML, eliminating the overhead of subsequent HTTP requests for those images. Along with a few other non-image-specific optimizations, that change made the site blazing fast, even when under heavy load (i.e., when linked from HN or /r/TodayILearned). (I'll refrain from linking the site to avoid the appearance of naked self-promotion, but my username is a dead giveaway if you care to see it in action).