Site page load time discrepency

Who's right: Google or Alexa?

[shallow]

Google Webmaster Tools says that at my site, pages take 8.6 sec to load, slower than 91% of sites.

Alexa: Average Load Time is Very Fast (0.32 Seconds), 87% of sites are slower.

Can anyone explain the extreme discrepancy between the two?

I suppose the only metrics that count are Googles. My developer has worked a lot on the site to improve speed but, thus far, nothing has changed in the report.

Info: WordPress, using Virtual Private Server

[pageoneresults]

I would trust Google's measurement before Alexa.

Have you implemented the new tracking code for Site Speed?

Measure Page Load Time with Site Speed Analytics Report
[Analytics.BlogSpot.com...]

In order for the Site Speed reports to work, you must make a change to your tracking code. The change is a simple insertion of one additional method:

_trackPageLoadTime();

[shallow]

Have you implemented the new tracking code for Site Speed?

No, but I'll have my web developer do so.

As I've stated elsewhere, I've gotten hit very badly by Panda. Hopefully speeding up the site will improve things a bit.