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?