What is a synonym for very fast?

Here are some synonyms for "very fast", depending on the context:

General:

* Rapid

* Swift

* Speedy

* Zippy

* Brisk

* Quick

* Fleet

* Accelerated

* High-speed

More intense:

* Lightning-fast

* Breakneck

* Blur

* Whirlwind

* Torrential

Informal:

* Like a shot

* In a flash

* At warp speed

The best synonym will depend on the specific situation and the desired level of formality.