Since upgrading to FF4, my web applications and browser start-up time have been slower, instead of faster as the upgrade promises. Any suggestions?

I feel like my web apps have been slowing down ever since the plug-in container was introduced. With the previous version of FF, I would have to close the browser and re-open it periodically to ensure that apps ran smoothly. Now, even that doesn't work. I've tried these applications in IE and they work with no problem, so I feel that the issue is in FF and not my system. Any tips would be much appreciated.
I've run all the troubleshooting steps listed on the help pages (ensuring that I have the latest versions, etc.), and the problems are still there. Thanks in advance.

You can disable the Plugin Container.
To do this,
* Type about:config in the address bar.
* Click on I'll be careful
* Type dom.ipc.plugins.enabled in the filter column
* Double click on the value to change it to "false"
* Restart Firefox
Plugin Container is disabled and now your apps may work properly.

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