Hello!
I have a strange issue. I had noticed some slow downs in the speed of worklfows on my farm. I thought it was just the audit table getting too big but after maintenance, I have narrowed the slowdown to the Send Email Action.
What is happening is as follows. The Worklfow runs quickly until after a send Email action, where there seems to be a pause of 15 to 30 seconds before the workflow continues or ends if that is the last action. I.E. If I have a workflow which sends two emails, the first is recieved promptly there is then a delay until the 2nd one hits and then the workflow continues for another 15 - 30 seconds even though it has nothing to do.
You can see from by pic below that each send email action is taking longer than normal. 
Any idea's?
Thanks T.