Collecting a very small amount of page load / location data
I had noticed that a site had an unreasonably long page load time on specific articles. I drilled down a bit into the report to find that on a particular article which had a recorded average page load time of around 11 seconds, there was actually very little data recorded - out of 384 page views, only a fraction actually recorded page load time, with most recording -100% as a page load time over the average. the map view only shows one recorded page load time. Is there a reason why such a small set of data would be collected?
Re: Collecting a very small amount of page load / location data
By default, a fixed 1% sampling of your users make up the data pool from which the page timing metrics are derived. See the Tracking Code Reference for details on customizing the Site Speed sample rate.