at/with lightning speed

at lightning speed

Incredibly quickly or speedily. Did you see that martial arts expert? He threw those kicks at lightning speed! At lightning speed, Mary finished her exam and raced out of the classroom.
See also: lightning, speed

with lightning speed

Incredibly quickly or speedily. Did you see that martial arts expert? He threw those kicks with lightning speed! With lightning speed, Mary finished her exam and raced out of the classroom.
See also: lightning, speed

at/with ˌlightning ˈspeed

very fast: The lecturer talked at lightning speed.They’re a very efficient company. They reply to your letters with lightning speed.
See also: lightning, speed