> I haven't looked too deep into WP's implementation, but are they actually doing it on page load? On page load (that is, when WP actually runs), WP fires off

> I haven't looked too deep into WP's implementation, but are they actually doing it on page load? On page load (that is, when WP actually runs), WP fires off a non-blocking HTTP request to itself. This runs at maximum once per minute, and shouldn't actually run if you're using Super Cache or similar and hit a cache page.