Youtube is really annoying me!

Hey ive had my iMac G4 since june 9 2009 and youtube hasn't ever worked properly i can only watch very low quality videos anything over that causes my mac to freeze up untill the video is finished and i watch youtube videos litterally everyday so you can see why i am unhappy in fact im so angry with it im going to sell the computer and buy a dell inspiron laptop note im not just selling the computer just because of youtube its little things im unhappy with (i didnt do my research on macs :D) so while im waiting till christmas to get my new laptop please can somebody find a fix for me?
My specs are:
800 MHz PowerPC G4 processor
512 MB SDRAM
40GB HDD
Thanks very much
Alex

I view You Tube videos on older Macs than yours, and may be able to help (until you get rid of your iMac, that is). The videos are not great, and definitely not HD, but nor are they choppy or stuttering.
Here's my method:
Open the Adobe Flash Player settings, which can be accessed when trying to view Flash content. Press the control key and click the mouse directly on the video. Either a contextual menu will pop up, for which you would choose Settings (or similar) or the settings will appear in a box within the video. These are the Adobe Flash Player settings, and you only need to do this once. Uncheck the box that says "Enable Hardware Acceleration." You should notice an immediate improvement once that setting is disabled.
The second thing you can do is to download Perian at www.perian.org. When you install Perian, it creates a preference pane in your System Preferences. You can change a few settings there, and there's a link to the forum if you find you need it. (There is also an option to uninstall Perian right there in the preferences, if you wanted to.)
Those two actions will take less than five minutes, and may make Flash video bearable. You'd need a RAM upgrade to get the best performance from your machine, and it is old (as Kenichi said). I have installed Perian and disabled Adobe's hardware acceleration on four old Macs, and noticed a huge improvement.
As an example, a few months ago I wiped the HD and reinstalled Tiger on my oldest iMac G3- a 400MHz slot-loader with the original 10GB hard drive, and only 384MB RAM. After following the above steps regarding Flash Player, I decided to go to You Tube and watch the entire 1999 Special Event Keynote where that particular iMac was first introduced. I opened ALL of the segments (ten You Tube videos) in tabs in Safari, pressing pause on each one as I opened it, so they could download fully before viewing. (Pausing until the video is fully downloaded also helps moderately with playback performance - enough so that I never forget to wait. ) I watched all the segments, one after another- about 90 straight minutes of You Tube video. The iMac in question has 8MB VRAM. Your iMac G4 leaves my Grape iMac in the dust in every respect. I will not tell you the played back pristinely, but it was not so bad I felt the need to stop the video. I would not have been able to stand it in the stock Flash Player configuration, that is certain.

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