I had kept my "Queue Listen Pipes" at the default of 4 for many years, But ever since aggressively using the anti-spam filters I have seen that the amount of time it takes to process an email (check it against 8 spam databases) is taking an long time - sometimes is will be as long as ten minutes before it finishes (one minute between blacklist lookups!).
FYI, the reason that it can take many minutes for IMail v8's anti-spam to process E-mails is that it runs spam tests in serial, rather than in parallel. Running them in serial means that it checks the results of the first test, then after it gets those results it checks the results of the second test, and so forth. Running the tests in parallel, however, means that all the requests are sent at once, and then the results are processed whenever they come back. This is much faster.
So if you have 10 tests, and it times out after 60 seconds, running them in serial (the way that IMail v8's anti-spam does it) can take a maximum of 10 minutes to scan the E-mail. Running them in parallel (the way that Declude JunkMail does it) can take a maximum of 1 minute to scan the E-mail.
-Scott
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