This speed test issues a number of Google Earth plugin API calls for every frame drawn. The number of frames per second is a measure on how fast this is done. On a decent computer you should get 20 - 50 fps.
If you are using Chrome or Firefox 4 or newer you should read this!!!
Applications on Planetinaction.com typically make thousands of calls per second to the Google Earth plugin. If each of those calls takes a tiny amount longer you immediately suffer massive performance penalties. These can be in the order of 5 - 10 times slower that they should be.
Fortunately in Firefox you can turn of the IPC protection to the plugin. If you type "about:config" into your address bar, you'll get to a page with a lot of settings. Find the line for "dom.ipc.plugins.enabled = true" and toggle it to "false". Restart your browser and things should run much better.
Amazingly, the Google Chrome browser won't play nice with the Google Earth plugin You just have to put up with a sluggish sub standard performance of Google Earth or use Firefox with the above optimization applied.
You can read more about the speed issue on the Google Earth Blog
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