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In several hash table implementations I’ve seen the usage of heuristics like “transpose” or “move to front” for items in a bucket.
Optimizing hashing functions aside, please.
If collisions are happening and hence buckets have several items in them, which must be examined it would be convenient if commonly accessed items were early in the list.
These heuristics make sense if there is reason to suppose that an item recently accessed is likely to be accessed again soon. When one considers something such as news stories, it’s quite likely that breaking news would be accessed frequently.