3 Words to use with swiftness

And then he was close to the street of houses again, and blind men, whirling spades and stakes, were running with a sort of reasoned swiftness hither and thither.

Four horsemen good, of the Zegri blood, with Lisaro go out; No flashing spear may tell them near, but yet their shafts are stout; In darkness and in swiftness rides every armed knight The foam on the rein ye may see it plain, but nothing else is white.

Had he a horse, would he with such swiftness shoot along the plain?

3 Words to use with  swiftness