Why does Mac Safari stutter playing YouTube videos?

While playing YouTube videos (or other streaming videos) in Safari
using both Snow Leopard and Lion, the video's stutter and stop.
When I use the Google Chrome browser, the videos play perfectly.
I can find no way to set the buffering values.
I don't feel that this is a hardware or network problem.
This is very annoying, Apple please fix this.
An example video:
http://www.youtube.com/watch_popup?v=Yfbchq0xQmQ&vq=medium#t=

You posted in the correct forum...  Most YouTube content requires the Flash plugin. Try troubleshooting.
Quit Safari.
Open System Preferences > Flash Player then select the Storage tab. Click: Delete All
Now uninstall the Flash plugin then reinstall new >  Troubleshoot Flash Player | Mac OS'
Very important to uninstall the currently installed Flash plugin first before reinstalling.
Launch Safari From your Safari menu bar click Safari > Empty Cache
Now try a video.
BTW... if you have the ClickToFlash extension installed, that can prevent Flash based video from streaming. It can also be installed as a plugin in /Library/Internet-Plug-Ins.
And check to see if Safari is running in 32 bit mode. Right or control click the Safari icon in your Applications folder then click Get Info. If the box next to:  Open in 32 bit mode  is selected, deselect, quit then relaunch Safari.
BTW, this is not an Apple issue. Flash is third party software for which Apple is not responsible for developing or updating. That's Adobe's job.
Thoughts on Flash

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