Submit reply delay when making a post

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Hi there, i also posted this in vb.com and wanted to see if anyone here has some suggestions or opinions on the matter. I have a fairly large forum thats run off a dedicated server, and for the past year i noticed that there was a delay/hang for about 5 seconds after a user makes a post and hits the "submit reply" button (which can get annoying). I have read that some admins had the same issue, and turning off the "enable email features" in the admin cpanel had fixed the hang which it did in my case as well. So now i have a large forum with email notifications turned off which isn't cool. Any idea what's going on, or if anyone knows anything about this? Any help would be greatly appreciated, as i don't know what to do anymore. Thanks.

Btw, i was suggested to use a cron based email hack which i have not tried installing yet.