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
Farlex Dictionary of Idioms.

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
Farlex Partner Idioms Dictionary
See also:
  • at lightning speed
  • with lightning speed
  • (as) fast as lightning
  • (as) quick as lightning
  • like lightning
  • (as) swift as lightning
  • go like lightning
  • turn of speed
  • a turn of speed
  • (as) fast as greased lightning