The 5000lb winches I've used are not fast. They are variable speed though, so as the load comes on it gets slower but keeps pulling. I also have a snatch-block pulley to double up the cable/power.
My brother has the 9500lb version on a Vitara, It will lift the thing off the ground no probs. And he's had no problem with that winch at all. Drives through rivers, bogs, submerged half the time. The bigger winch seems to be a better unit reliability wise.