how is my air compressor performing?

That extra screaming bloody hell murder stress from 4000 to 4500 is your compressor killer there. That's where many fail as noted lately. I would only fill to 4000psi max since the compressor has way less stress and wear Filling more often to 4000psi than less times going all the way to 4500psi. It's like red lining your car all the time just to see what eventually happens...

I would do it if I had a 4 year Wal-mart extended warranty though... Probably...

Disregard If yours is NOT CHINESE MADE but NOT the $2000 Daystate 110(MCH3)....