Here's an update.
For the record, I am using spamd/spamc -- this server relays mail to another server for delivery there.
Per another suggestion, I started spamd with the -L option to do local checks only, which skips the Razor check (among others). Messages are now being processed in 2.5-6 seconds.
2.5 to 6 seconds without any network checks suggests that the server hardware is under provisioned for the amount of mail that it has to handle. You should be looking at times of <1 second with spamc/spamd and no network checks, except for times when you get a spike in your incomming mail volume....
I've now got "use_razor1 0" and "use_razor2 0" in my local.cf and I've remove the -L option to perform the rest of the net checks to see what the results are.
What are the other net checks that are getting done? What might affect thier performance? I've enabled the name service cache daemon (nscd) to speed up DNS queries (I'm not using DNSBL). Haven't seen an appreciable change in throughput.
Probably because DNS lookups aren't your limiting factor. Maybe CPU speed, free memory or disk I/O performance are.
Regards, Simon
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