Sorry this isn't very helpful but why does it have to be "quickly"? Surely you never have to add more than a few lbs. right? I have a 150 psi cheapy portable from Lowes, I use 120 psi in steer & 90 in drive & tag. If I ever have to add it only takes a minute or two per tire. I would keep it as compact as possible to save basement space & just be a little more patient but that's just me. Is it possible your current unit isn't working properly?