rapid

Moving, acting, or occurring with great speed. synonym: fast.

An extremely fast-moving part of a river, caused by a steep descent in the riverbed.

In photography, said of plates, lenses, and subjects which require short exposure or print rapidly.

Moving or doing swiftly or with celerity; acting or performing with speed; quick in motion or execution.

Swiftly advancing; going on or forward at a fast rate; making quick progress.