My email speed for about a week has been incredibly slow during the loading process. What used to take about 3-5 seconds now takes at least 30 seconds. What has been changed and why? How long will it be to return to prompt loading of emails?
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.
The problem remains using either Chrome or Edge browsers.