Wiktionary
a. Very fast, or of very short duration; especially concerning events that take place in femtosecond or picosecond timescales.
Usage examples of "ultrafast".
While he was taping three clips back to back for an ultrafast reload, another bulletin came over the public address.
It has always seemed to me of paramount importance that we do so, even though the cost of maintaining the necessary ultrafast scout ship has been a crippling burden on the fund.
Not even good firewalls should be able to resist ultrafast hacking by a quantum computer.
The Class M shape unmistakable, ultrafast and equipped with smart missiles that could take them out even at this distance, even with evasive maneuvers.
I coveted but had given up expecting ever to own: a computer with an ultrafast ISP connection, a hand-me-down television twice as big as the one that graced the living room at my house.
Bad Clams had a forty-foot Cigarette-one of those ultrafast, ultraslim power boats so coveted in Florida.