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Re:WordPress 3.6 arrives with better post locking, built-in ... by rmccue on Friday August 02, 2013 @12:22AM (#6145307)
> 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.

Re:WordPress 3.6 arrives with better post locking, built-in ... by jacques_chester on Friday August 02, 2013 @12:24AM (#6145310)
It's non-blocking on the page load, but it still ties up an additional PHP instance.