Ducted A/C Unit - Bypass Ductwork for Better Cooling??

Never got into the technical parts of it, but our last MH was ducted flow, very nice and quiet, but took forever to get cool air on a hot day. It never made sense to me to have to cool the whole duct work and ceiling area.....that is scorching hot, then an hour later start to get some cool air,.....that never was very "kool" But thankfully, most times I never was much for goin campin in hot weather, just to sit around huggin an air conditioner/power pole, or a noisy generator.