Just for the record, drilling metal with a brace bit ain't a biggie if your bit is sharp. (A DrillDoctor is DEFINITELY worth owning — and using as LIGHTLY as necessary on older bits.) I own a biggish handful I've used "in the field" to repair horse-drawn farm machinery, gate hardware and so on, when I've been too lazy/frugal to take a machine or project back within reach of a power cord. Helpful hint: I own 2-jawed braces with three different "throws" — 6", 10" & 14" — for various torque desires, particularly in wood.
Going back to drilling metal: I'm a strong advocate of "stepping up" the size of drilling to reduce the workload on both me and the larger bits. Oh, and with a nod to modernization, WD-40 — or even dribbles of oil off of a dipstick — have been helpful too.
Finally, in an old blacksmithing manual I read that the suggested speed for a 1/2" bit was 50 RPM. It's also said that "Instant gratification takes too long in today's world." What, me hurry?