Achievement: Speed IX

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Speed IX

Finish a collection between 7k and 5k with an avg. time of under 10 seconds.*

*The collection must contain at least 100 problems.

Recently completed by

Filin01 2k, Erisia Music 2k, Jionaa 1k, RERO_RERO 5k, Howard Canaway III 2k, max2025 3k, richyfourtytwo 3k, Diana Secret 2d, Alquimia 4k, Оля Киреева 11k

and 91 others.