Asynchronous PHP

[Ipstenu]

See if the PHP can be run async, to prevent unneeded slowdowns (and indeed, make the save a faster thing!)

• https://stackoverflow.com/questions/26826780/asynchronous-php-code-in-wp-plugin
• https://techcrunch.com/2014/07/31/wp-async-task-our-new-open-source-library/

[Ipstenu]

WARNING:

Also even if it was I'd like to mention (as nobody has yet) that many hosters have restrictive settings for the number of parallel php processes aka max_children php setting. For instance, for Gandi.net size M it is 4, for L it is 8. So if you'd PURGE'ed 8 URLs on parallel then you'd DOSed your server.

Okay so that's gonna have to be considered!