Quite frankly, Induction Smelter ends up being quite fast.. If you're really wanting speed, 4x Pulverizers feeding 1x Induction Smelter. Technically, I suppose you could do 5x, but I know for a fact that it can handle 4x.
Induction Smelter will process 2x pulverized <ore> for a cost of 80 MJ. At 4 MJ/t this means it processes 2x pulverized <ore> at a rate of one process per 20 ticks, or 1 second. Your secondary outputs can go straight into a regular Powered Furnace, it should easily keep up, but if you are worried, put a hopper on it and let them feed into the hopper.
It might not beat out a rotary macerator with a ton of upgrades (and wtf, upgrade in an advanced machine?), but it's quite fast enough for micro-smelting for a specific project, and will more than keep up with even the most ridiculous of automated mining operations.