We're sorry to hear you're experiencing slowness when working in your account. Please make sure you are using a compatible web browser that is supported by Constant Contact. In addition, you can also try clearing your web browser's cache. We're also happy to help further troubleshoot if you'd like to send us an email at social_support(at)constantcontact(dot)com. Be sure to include the username for your account, a reference to this post, and a bit more information:
Thanks and I hope this helps!