I had a job recently where I had a chance to really put the screws to my 90. It wasn't entirely intentional as my Husky 2100 finally bit the dust after 34 yrs(on the job, how embarrassing!) and I had to have the 90 as my main saw. It seemed to love the new-found responsibility.....it ran so well, there were times when I had to remind myself to quit leaning into it so hard, as it wasn't the 2100. I ran a 32" bar on it with .404 skip-tooth chisel. The bar is .063 and I thought that might have been a bit much and considered a .058 gauge for it(still am) but it seemed to handle it fine.
Here is a pic of one of the typical trees...this one was around 4' at the butt and I had to re-cut all the stumps low for the landowner(what a pain) and I'd already done that before the pic.
That's a big excavator in the background.
Rocks to the left of the stump under the sawdust.
View attachment 354673
View attachment 354672
Here it is resting after this round in another tree group...stumps re-cut and the bigger logs already skidded out...rocks everywhere!
View attachment 354681