Usually means: Extremely rapid, almost instantaneous speed.
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We found 6 dictionaries that define the word ultrafast:

General (6 matching dictionaries)
  1. ultrafast: Merriam-Webster
  2. ultrafast: Collins English Dictionary
  3. Ultrafast, ultrafast: Wordnik
  4. ultrafast: Wiktionary
  5. ultrafast: Infoplease Dictionary
  6. ultrafast: Dictionary.com

Definitions from Wiktionary (ultrafast)

adjective:  Very fast, or of very short duration; especially concerning events that take place in femtosecond or picosecond timescales.

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