09-20-2012, 08:10 PM
Am I missing something or does the new Speed Index score not match what's displayed in the filmstrip and visually complete percentages?
This result has a Speed Index of 1.4 seconds to visually render the above the fold experience but then looking at the filmstrip for the median run it's only 88% visually complete at 1.4s and doesn't appear complete till around 2.4 seconds. I'm seeing these kinds of differences across a range of tests.
Those are big differences and even though speed index is doing some very clever colour histogram matching I would expect speed index to align with what's happening in the filmstrips far more closely. Just how fuzzy is the colour histogram threshold for determining the speed index?
This result has a Speed Index of 1.4 seconds to visually render the above the fold experience but then looking at the filmstrip for the median run it's only 88% visually complete at 1.4s and doesn't appear complete till around 2.4 seconds. I'm seeing these kinds of differences across a range of tests.
Those are big differences and even though speed index is doing some very clever colour histogram matching I would expect speed index to align with what's happening in the filmstrips far more closely. Just how fuzzy is the colour histogram threshold for determining the speed index?