Performant is still not an adjective
"Deep Zoom enables the ability to zoom almost arbitrarily large images in Silverlight in a performant manner."
This is still the most ridiculously over-used word in tech circles, because it's made up. It can, technically, be used as a noun, but "performer" is more common. Seriously, with so many English majors writing code these days, how does this happen?
I guess I find its use agitant. ;)