How come the updated xfinity is so awful? It takes 5 times longer to get my mail to even open, you must go round and round with clicking mail or back or to get back to where you want. It takes minutes to even open an email.
Try clearing out your browser's cache/browsing history. When you have done that, close out the browser and re-start it in a fresh session. If that doesn't do it, then try using a different browser.