Thank you for bringing this to our attention! I can understand how important it is to easily work in your account. With that said, where exactly are you experiencing this lagging in your account? Are seeing any error messages? What steps are you taking before this lagging starts? We have seen cases where some 3rd party add-ons could affect how Constant Contact works. So if you have not yet tested your account in a different browser or a private/incognito window, I would suggest doing so.