Thank you for bringing this to our attention! What actions are you taking where you are seeing this slowness in our site? For instance is this happening when logging in, trying to edit or open a campaign, switching tabs in your account? If you are experiencing any slowness the first step we always suggest is testing your account in a different browser or through a private/incognito window. Testing your browser like this let's us see if there are any 3rd party add-ons that is affecting how Constant Contact works.