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Joshua Bixby recently wrote a fairly definitive blog post on site speed
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.
If you actually read the article
you'll find that he is by no means overblowing the importance
On pingdom it's loading under 2 seconds.
Unless netmeg tells us otherwise, I'm assuming Google's Page Speed Insights [developers.google.com] which grew from their original browser plug-in [webmasterworld.com].
The statistics in WMT, however, are based on actual real-user measurements. If only they were updated more often! Per-country statistics would be helpful too.