[syslog-ng] time_sleep in high udp environment?

Hi, we were debugging message drops on our syslog-ng server (rpm syslog-ng-3.0.5-1.rhel5.x86_64) and found out that if we commented out the time_sleep global option we had set (value of 20) that all the drops went away. Initially we had set this value while reading through the pdf documentation (page 136) figuring that since we had potentially a lot of traffic that this would boost performance. So I guess I'd like to know why we seemed to see the opposite behavior with this option enabled. We don't really do tcp connections, so maybe this option was useless to begin with. Anyways, it made me curious, so if anyone can enlighten me I'd appreciate it. Thanks, Tim