Any idea what could cause slow hydraulics? All hydraulics are slow. Tilt, Side shift, Lift and even when Lowering.

I checked the pressure on the delivery hose connector, and it is correct based on manual, at 2,500 psi. I also drained all the hydraulic oil, and filled it in with new 10 gallons. The old oil was dirty and dark red, please see second picture.
https://imgur.com/a/ta1H2Rc

It is a 2012 Mitsubishi FG30NGLE
Serial number: AF13G00114
Thanks!