the normal system recommendation for syslog messages is :
1000 Syslog per second incoming, 200 syslog per sec of DB insertion in bulk insertion mode.
just check out if there is any PIX device or any other device sending message in high burst..
See the following points for troubleshooting the RME installation :
To improve system performance for RME:
Reduce the number of syslog messages saved to the CiscoWorks database.
Increase the interval used by Configuration Management to collect information about managed devices.
While using CMF Syslog Service, you can turn off DNS lookup to improve performance of Syslog Collector.
To turn off, set the registry key HKEY_LOCAL_MACHINE > System > CurrentControlSet > Services > crmlog > Parameters > CrmDnsResolution to 0.