[uhl-truh-fast, -fahst]
extremely fast: ultrafast computers.

ultra- + fast1

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World English Dictionary
ultrafast (ˈʌltrəˌfɑːst)
extremely fast: an ultrafast internet connection

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Interestingly, the researchers found that blind people only use the right
  visual cortex for understanding ultrafast speech.
To unearth the bacteria's inner workings, the researchers zapped the connective
  proteins with multiple ultrafast laser pulses.
Tiny, ultrafast shutters can then be used to eliminate all but a single
Researchers then zapped each atom with an ultrafast laser that caused each atom
  to emit a single photon of light.
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