Miss rate

In computing, the miss rate refers to the percentage of times that a required piece of data is not found in a fast-access storage location, like a cache. When a processor looks for data, if it’s not in the cache, it must retrieve it from a slower storage, which takes more time. The miss rate indicates how often this happens, so a lower miss rate means data is more frequently found quickly, leading to better system performance. Essentially, it measures the efficiency of the cache in providing the data the processor needs.