Delete or save your mail. Those that have been saved to folders don't contribute to the problem. Or change your preferences to check for mail every three minutes. We are using the same computer for our application server and our web server. As our web sites become more popular, we may be feeling the strain of serving web pages to the public.
Plans are underway to move the web server to a computer on campus.
This will enable the public to get our pages faster without effecting our office computing. Do what you can to reduce the load on your system when you can. And be patient until the upgraded system arrives.