It's much more likely to have reached maximum concurrency than maximum throughput. When the site is accessed by a general audience, many will access it through

It's much more likely to have reached maximum concurrency than maximum throughput. When the site is accessed by a general audience, many will access it through a 3G connection or worse, and their slow speeds will cause the number of concurrent connections to balloon. This website uses Apache, which sometimes defaults to a maximum of 10 concurrent workers.