TypicalSurfer - 10:03 pm on Oct 12, 2012 (gmt 0)

How so? As I understand it, what you need is actual page speed data taken from the visitors' browsers - and you can get that with boomerang.js

Just running with what Google Developers are showing:

This feature allows you to run experiments where segments of your traffic get the page rewritten with different settings in order to figure out which filters work best for your site. It reports to your Google Analytics account, storing data in a custom variable.

https://developers.google.com/speed/docs/mod_pagespeed/module-run-experiment

It's a little too integrated with Google stuff for me to consider it.