Thread:Project:Support desk/How do I enable the edit throttle/reply (3)

It requires memcached because it stores in memory the amount of edits, moves, etc per user and period. It could be stored in database instead, but it may be a noticeable performance penalty compared to store that small amount of data in memory.

Storing things in memory is done with memcached, because in PHP, when the page request ends, all variables in memory are freed.