MarvinH - 7:57 pm on Jul 8, 2012 (gmt 0)
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.
In my experience, these stats are updated daily most of the time. Sometimes it stopped updating for a day or a few days, but then it quickly caches up.
The accuracy of the results depends on the number of data points. For example, you will likely see a wide fluctuation of speed reported by GWT if GWT reports low accuracy due to fewer than 100 data points, but the graph is more stable when GWT reports medium accuracy (between 100 and 1000 data points).