Why do some pages blink into place like they have a hyperdrive installed; and others dawdle their way into existence? The former likely have some simple tricks figured out. Those tricks are actually easy to figure out and the benefits are broad. They improve the user experience and they make search engine optimization easier. A couple of these tips may be a little more server intensive (like Keep-Alive), but some of them can actually make your site easier to deliver.
Why are Google and Amazon rich? They've had me on their payroll. I have been working for them for a decade. I signed up for Amazon Associates over a decade and Google AdSense almost a decade ago.
This isn’t a shocker: commerce is driven by inequality. The more inequality that exists the greater the opportunity for high profits. When insurance companies hid their rates you had to go a great deal of effort or accept the bad deal in front of you. Then Progressive Insurance and businesses like them changed the game: they publish their rates and the rates for comparable plans from other providers. If they didn’t do this, websites and consumer reporting would do the same thing for them. This has knocked down the inequality between rate providers.