It's funny to think back, as I've just recently installed a browser extension to do the opposite (i.e. to prevent "open in new tab" tabs from doing any work until I foreground them.)

Today, my computer's memory is far more constrained than its network bandwidth. I find it very easy to accidentally open tons of tabs very quickly (esp. from the HN front page!) until suddenly the browser is swapping and everything's slowing to a crawl trying to process all those new page DOMs.

And yet, even when it doesn't choke the computer, I find no real benefit to preloading pages in the background any more. At least on my connection, the page load time after I focus a tab is almost imperceptible.

How things have changed!