How to Say "super-fast" in Spanish
The Spanish word for “super-fast” is “atómico” — C1 level.
English → SpanishC1
adjectiveC1informal
describing incredible speed

Examples
Ese corredor tiene una velocidad atómica.
That runner has an explosive/atomic speed.
¡Fue un chisme atómico!
That was some massive gossip!
La noticia tuvo un impacto atómico en la empresa.
The news had a massive impact on the company.
Using it Figuratively
When you use this word to mean 'huge' or 'fast,' it's still an adjective, so it still needs to match the gender of the noun.
Overuse
Learn Spanish with Inklingo
Interactive stories, personalized learning, and more.