I show the 550 vid in the thread My slowest saw.Here is a vid of my 562 in the same wood running a 20" bar and round chisel chain. The fastest time for the 550 was 4.82 with most being over 5 to 5.5 and the 562 fastest was 3.42 with most being right around 3.5.The wood is 12"
Squarefile this is my ported 7900 with 3/8 round chisel, I used this chain at the gtg and it was a little dull for this video. The fastest of these cuts was about 2.82,same 12" wood