I use windows 8. Once in a blue moon everything works fine, but the next day (or even the next hour) things go back to being too slow to use. And then I'll get the message: Warning: Unresponsive script A script on the page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete. Script: chrome://messenger/content/mailWindow.js:180

I've tried clicking Continue, I've tried clicking Stop script. Neither speeds things up.