Which basically confirms that the problem is one of MailWasher's making.
I have found that ever since it was upgraded (can't recall when) requiring the use of .net framework it has been sluggish at startup (hence the inclusion of the MailWasher PreLoader.exe), which I don't allow to start on boot. So for me MailWasher takes a little longer to start from cold.
Also on shutdown when it has to tidy up, save settings, etc. and close down.
I have been using it for many years mainly because I was on dial-up and it effectively got rid of the spam before I downloaded the remaining legit email on slow dial-up (not a problem now I'm on broadband. I fear that it has become bloated but it is still a very effective program.