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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. If it turns out not to be a browser issue, all you can do is wait it out. Mine will slow down once in a great while, but it usually doesn't last very long. Servers can slow down due to a problem, or just high traffic volume.
Have had same issue for 6 months, amongst others, been with this company since 1983, through various name changes and I have had enough, will be calling tomorrow to discontinue service.