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Re:Why WP Engine has already won by raheemm on Wednesday August 18, 2010 @12:53PM (#1614740)
Yah I asked him for the details in the comments and he said that WP Engine runs the following on their servers:

NGINX (reverse proxy)

Apache (webserver)

APC (PHP Accelerator)

CDN baked into the architecture

Insanely powerful hardware

Re:Why WP Engine has already won by willieljackson on Wednesday August 18, 2010 @01:56PM (#1614960)
Yeah, I thought about letting Cullen address your comment but he specifically mentioned that they'd be making the information available for anyone to use and hopefully build upon.

It's certainly not hard to figure out what they're running of course. http://builtwith.com/wpengine.com and the "Net" tab of the Firebug plugin tell most of the story.

Re:Why WP Engine has already won by smartbear on Wednesday August 18, 2010 @01:12PM (#1614804)
Yup, also hardware security devices on the front end -- things like the obvious script hack signs and DoS protection.