1
general::
Phrase(s): *quick as a wink [and] *quick as a flash; *quick as (greased) lightning; *swift as lightning
very quickly. (*Also: as ~.) • As quick as a wink, the thief took the lady’s purse. • I’ll finish this work quick as a flash. • Quick as greased lightning, the thief stole my wallet.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Also, quick as a bunny or a flash. Very speedily, as in He was out of here quick as a wink, or She answered, quick as a bunny. These similes have largely replaced the earlier quick as lightning, although quick as a flash no doubt alludes to it ( Also see LIKE GREASED LIGHTNING), and quick as thought, now obsolete. The bunny variant dates from the mid-1800s, the others from the late 1800s.
American Heritage Idioms