On my Mac with OS X Lion I cannot view Youtube HD Videos in Fullscreen!!

Whether I start an HD Video on Youtube,
everything is working very good, in HD too.
But if I change to the fullscreen mode, the Video is more slowly, about only 10 frames per second!
I know, my iMac 24" is old...
But what is the problem? Processor, RAM, .....?!?!
My Mac:
iMac 24" 2007/2008 (I don´t know exactly)
2,8 GHz Intel Core 2 Dou
2 GB 800MHz RAM
320 GB HDD
ATI Radeon HD 2600 Pro 256 MB
Standart Operating System is OS X 10.5 but
I have an upgrade on Lion.
Could you help me?

I'm having difficulty visualizing what is wrong but try some basic steps first:
Launch Safari while holding a Shift key - this will start Safari with just your Home page
If you can see Reset Safari from the Safari menu, try that.
In addition to downloading and installing Safari again, try reapplying just the Snow Leopard Combo Update: http://support.apple.com/kb/DL1399 There is no need to uninstall Safari first.
Lastly try deleting Safari's Preferences file: ~/Library/Preferences/com.apple.Safari.plist

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