buffered_logs
While this directive used to affect multiple log files, it now only applies to cache.log. Squid uses the
stdio library for cache.log. If this directive is enabled,
Squid calls fflush( ) after every write. This allows
you to see log file entries as they are written. You might want to
disable buffered_logs if you are debugging Squid
in a way that creates a large number of cache.log entries.