Jez123 - 3:59 pm on Jul 7, 2012 (gmt 0)

I get different ratings from every tool I try - in fact the one in GWT says one of my sites is slower than 75% of sites, but the site screams for me, and the page speed checker at googlelabs says it's 94/100. What's a person to believe, and how to get a really reliable take on it? I sure don't know.

Me too. I had someone optimise the hell out of my site. Moving all images etc to cloud, as well as sprites and reducing all requests down to an absolute minimum and GWY reports my site as slower than before!

Does anyone know what they take into account? Is it an average all over the site over a monthly period or something else?

It's very frustrating! On pingdom it's loading under 2 seconds. And that's with a very slow first byte time. Currently in WMT it's reporting 6.6 seconds.