Flash is a bad idea, according to Steve and Apple. To avoid Flash from ruining your desktop experience with 100% CPU usage, you can block Flash from loading into Safari on your Mac OS X using this little [ClickToFlash](http://rentzsch.github.com/clicktoflash/) plugin.
Once installed, Flash content will not be loaded. Instead a gradient gray area will occupy the Flash content. Click on the blank area if you want to load the Flash anyway.
![Click to Flash Safari Plugin](http://sanziro.com/wp-content/uploads/2010/03/click-to-flash-safari-plugin.png)
You can choose to turn on or off the plugin from its settings page. To access the plugin settings, either click on the icon on the left-top corner of blank gray area or from Safari menu *Safari > ClickToFlash > Settings*.
The advantages of ClickToFlash are numerous. Since Flash isn’t loaded until you specifically ask for it, your CPU usage will stay at normal levels when browsing the web. This has tons of benefits: web browsing stays speedy, your Mac laptop won’t get as hot, and your Mac’s fan won’t come on as often. In fact, we guarantee* that ClickToFlash will quintuple your battery life and that it will protect those precious parts of your body on which you rest your laptop! (*note: not actually guaranteed)
With ClickToFlash, you can setup the plugin to load YouTube video in H.264 format instead of Flash. H.264 video perform favorably compared to Flash video in Safari.