Yes, the ARB pump takes a long time to fill 4 tires to 30psi. I hook mine up and walk away for awhile. I keep a guage in-line so that I can see at a glance that my pump takes forever!
Actually, it keeps me from having to unplug the hose each time I want to check the pressure.
Now, I've noticed ARB sells different compressors. The faded sticker on mine says that it has a 50% duty cycle = slow! Maybe the ones they have now are better, but if you have the dough, go big.
I'm only hanging in there with the ARB pump as it was on the Disco when I bought it. One day I'll get a CO2 tank or a better air compressor though. After awhile (e.g. watching everyone else air up and leave after a run way before I'm even close to being done airing up), it gets a bit old.
Andy, if you want to see how slow it is in person, come on by the house.