Suggest an editImprove this articleRefine the answer for “Why is it important for a hash function to be fast?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)It matters that a **hash function is fast**, because it is called on every operation with a hash table: inserting, searching, updating, and removing an element. **Key point:** a fast hash function is the foundation of a hash table's performance; if it is slow, the hash table loses its point.Shown above the full answer for quick recall.Answer (EN)ImageIt matters that a **hash function is fast**, because it is called on **every operation** with a hash table: inserting, searching, updating, and removing an element. ## If the function is slow, everything suffers 1. Every access to the table requires computing the hash, so even "O(1)" access turns into a long process. 2. The hash table stops being efficient: its advantage is **speed**, and that is exactly what gets lost. 3. With a large volume of data (millions of keys), even extra microseconds spent computing the hash add up to huge delays. ## Goal A hash function must be **simple** enough to run almost instantly, and **good** enough to distribute keys evenly (minimal collisions). ## Conclusion A fast hash function is the foundation of a hash table's performance. If it is slow, the hash table loses its point, it would be simpler to just use a regular list or tree.For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.