Apple Mail running very slowly

I have all the updated softwares; el capitan, apple mail, spamsieve, etc. Ever since I installed spamsieve apple mail is running ridiculously slow AND I am losing internet connections with different email services. Love how it cleaned up my inbox, but I’m losing a lot of time having to restart apple mail, waiting for email connection to reconnect, having to wait for the next email to be selected.

Is there a fix or is this typical spamsieve protocol?

SpamSieve normally doesn’t cause Mail to slow down, and I don’t think it’s even possible for it to affect your Internet connections. My guess is that you are having network issues and those are what’s causing Mail to be slow. I recommend that you: