I bet you will find with a highly tuned single flute it will 3-5x the performance. As in 5x faster at the same resolution. You can always rough with a single flute fast and grind with that bit to your finish tolerance. That should increase it’s performance considerably. (In production I am cutting 20mm/s 13mm deep in one pass in MDF).
I love all the tests!!! Make sure you test different RPM as well. For my production cuts I am running my routers a click or two up from minimum RPM. The single flute can take a large bite.