as a machinist, i have made delrin bushings for quite a few applications [non auto related - the high pressure gas meter industry] over my 45+ year employment career, and they worked great without lubrication, some at a 1,000+ rpm range.
i also have machined delrin bushings for the control arms on my own designed suspension system on my 33 dodge "humpback" panel, as well as bushings for some dirt burner control arms. those worked quite well, despite the hammering they take at the track.
i make sure they are able to be greased well, and they don't squeak when pushing up and down on the car.
this picture just shows the suspension in the design stage, using slip fit aluminum bushings for assembly and checking camber change and toe change [bump steer] before the delrin bushings were made.