Timeout 15
KeepAlive On
MaxKeepAliveRequests 500
KeepAliveTimeout 3

<IfModule worker.c>
                ServerLimit         40
                ThreadLimit         40
    StartServers         20
    MaxClients         600
    MinSpareThreads    20
    MaxSpareThreads    40
    ThreadsPerChild     20
    MaxRequestsPerChild  0
</IfModule>