Are there cases when iterating over a slice is faster than iterating over a map?

Yes, they are possible.

Iteration over a slice occurs with predictable index-based access, which is usually more efficient due to data locality and CPU caching optimizations.

Iteration over a map, on the other hand, involves computing a hash for each key and searching in a hash table, which requires more computational resources and may have lower data locality, especially in case of hash collisions.

Therefore, iterating over a slice will generally be faster in most typical scenarios, especially for large collections. However, actual performance depends on data sizes, used types, hardware, and the specific implementation of hash functions and hash tables in the Go runtime.