I am sorry that this is happening. Can you tell me where this is occuring within your account? Are you seeing this on every page, the contacts page, the library page, or somewhere else? To help you can test using another browser or using the browser without add-ons.
Let us know if this helps.
Thank you for letting us know. We are aware of an issue that is causing some slowness in some accounts with certain Internet Service Providers. So that we may look into this further for you, please send us an email to social_support(at)constantcontact(dot)com with the following details:
Once we have this information, we can track this in your account and work towards resolving this for you.
I appreciate your message and look forward to your response. Thank you for using Constant Contact and for your time!