The other major consideration is available system memory. On memory-challenged systems cache is probably best disabled. To help assessment of the cache's efficiency for any given site monitor the administration menu's cache report . Two sets of data provide complementary information, cache activity and file request profile. Activity information summarizes the cache search behaviour, in particular that of the hash table.
Requests involving scripts, and some others, never attempt a cache search.
This is very efficient. This is decisive and is also very efficient. Collisions require further processing and are far less efficient. A large number of cache misses compared to searches may only indicate a large number of non-cacheable requests and so depending on that further datum is not of great concern. Files information summarizes the site's file request profile.