Recommendations

PageSpeed
YSlow

PageSpeed: Combine images using CSS sprites

Overview

Combining images into as few files as possible using CSS sprites reduces the number of round-trips and delays in downloading other resources, reduces request overhead, and can reduce the total number of bytes downloaded by a web page.

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Details from Google

Similar to JavaScript and CSS, downloading multiple images incurs additional round trips. A site that contains many images can combine them into fewer output files to reduce latency.

Summary

Images
High
Moderate
90%