When I work on organizing my contacts for about 30-45 min, the web site becomes very slow. I have to close the browser and then open your web site again in order for it to speed up. The process of organizing the contacts is slow to begin with, and slowing it down even more is frustrating.
I can understand how important it is to easily work in your account! I apologize this has not been the case. What browser are you working in? I have taken a look at your account and was unable to replicate this same experience. Have you tried working in a different browser or even a private/incognito window? If not this is a step I would suggest taking. Testing your browser like this allows us to see if there are any 3rd party add-ons that could affect how Constant Contact is working.