Thank you Tom, and I hope you and your family are safe and healthy, also. Wild times, lol. We need to do another phone call, soon.
I had toyed with the idea of split sawteeth, but in my mind the gold standard was the Timberline survival knife, and it went through a 2x4 in approximately 30 seconds or so, and those teeth were not split. To me, splitting them both adds a step, and by removing metal slightly weakens an already questionable design feature. So I decided to not split them, as I could not find any evidence that it would appreciably increase the speed that the saw would cut.
In the video below, using an M7 of mine (with a 7.75" long blade, so probably a 3.5"-4" saw), I am able to go through a fairly sticky 2x4 in about 24 seconds. There are a lot of variables involved, but I just don't see splitting the teeth reducing that time by much. Maybe someday I will prove myself wrong. Again, lol.

Sam