7 is CDN, and is necessary in the case he described shortly before -- a "hot article". Presumably, a hot article will not get lots of repeat traffic from the sa

7 is CDN, and is necessary in the case he described shortly before -- a "hot article". Presumably, a hot article will not get lots of repeat traffic from the same visitor (sure, someone might browse, but you're probably getting 90% one-time visitors). Cache headers do nothing here.. a CDN is the only viable solution... And frankly, using CloudFront for 3 years at work, I started putting my own websites behind a CDN because it costs pennies to do so. This does not mean I disagree with your other statements, I too found it a mix bag of somewhat obvious or slow-server specific (not just low-bandwidth)