fastest-moving

Adjective

fast-moving (comparative faster-moving or more fast-moving, superlative fastest-moving or most fast-moving)

1. Moving rapidly.
   • Most of the "railroad" films of the next decade were suspense features exploiting the dramatic quality of the fast-moving train in danger or^([sic]) threatening the beautiful heroine tied to the permanent way by the villains.1958 February, David Gunston, “Railways on the Screen”, in Railway Magazine, page 87

   Antonyms:

   slow-moving

2. Of a situation in which events follow each other in quick succession.
3. That is sold quickly.
   • fast-moving consumer goods