Depending on your browser go to TOOLS. Clear cache, clear temp files and then restart. This should make it run much better. If you have passwords saved or request to stay logged in you will need to reenter those passwords. They are stored in cache.
Let me know how it works
"If a man will begin with certainties, he shall end in doubts; but if he will be content to begin with doubts he shall end in certainties." Sir Francis Bacon