The HTTP Archive crawls the world’s top 500K URLs twice each month and records detailed information like the number of HTTP requests, the most popular image formats, and the use of gzip compression. We also crawl the top 5K URLs on real iPhones as part of the HTTP Archive Mobile. In addition to aggregate stats, the HTTP Archive has data (including waterfalls, filmstrips and video) for individual websites, for example, Apple, CNet, and YouTube.
From HTTP Archive: past and future | High Performance Web Sites
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