CLOCK and CAR can perform a bit better than LRU in certain situations.
Notably, CLOCK keeps items that are accessed atleast once during a round while LRU will kick out the least accessed item.
The benefit of using CLOCK is that you don't have to maintain a list but only a ringbuffer. Removing an item for a CLOCK's buffer can be almost free if you use a single bit to indicate presence. A LRU will have to maintain some form of list, array or linked. In practise, LRU is expensive to implement while CLOCK is simple. CAR offers LRU performance with less complexity.
Notably, CLOCK keeps items that are accessed atleast once during a round while LRU will kick out the least accessed item.
The benefit of using CLOCK is that you don't have to maintain a list but only a ringbuffer. Removing an item for a CLOCK's buffer can be almost free if you use a single bit to indicate presence. A LRU will have to maintain some form of list, array or linked. In practise, LRU is expensive to implement while CLOCK is simple. CAR offers LRU performance with less complexity.