It slows down everything by default. Performance-critical is relative, an app that could serv 100 req/s might not be optimized because that is sufficient, but i

It slows down everything by default. Performance-critical is relative, an app that could serv 100 req/s might not be optimized because that is sufficient, but if clearing the cache on every context switch reduces it to 70 req/s suddenly needs expensive man-hours for optimization.