A graph showing the Speedometer benchmark comparing Firefox, Chromium and Chrome. In the graph, lower is better. The top of the graph shows Chromium at around the 120 mark, with a slight change for the worse towards the end of June. The middle of the graph shows Firefox, rapidly closing in on Chrome, moving from ~150 to ~165. The bottom fo the graph shows Chrome fairly steady between ~165 and ~170.
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I think it is so that on all graphs “lower” down is better. But agree it’s kind of unusual layout. Looking at the graphs for Linux i wonder what happened in feb 11:th this year - where all values for Firefox got a lot worse.
Sometimes the hardware or software configurations of the machines running the tests changes, or a bug in the test harness itself is fixed, which can skew all of the results at once.