[gojomo]

For completeness, it could be interesting to also test:

• separate image files: after the cost of the initial many-separate-loads (which might be minimized by pipelining/SPDY), once reaching the cached-condition, might having them as individual artifacts again show some wins (no translations/trimming; shorter/simpler CSS)?

• data URIs inside CSS rather than HTML: on the off chance that leads to better post-data-decode image caching than re-parsing the cached HTML