I've noticed a strange problem about watching YouTube on my MDD 867DP with 2.0 GB RAM and Radeon 9800 Pro. In general, YouTube plays very badly in 10.5.8 compared to 10.4.11 on the same Mac. I don't know when the problem started but I'm sure I used to watch YouTube without problem on 10.5.8. Using the MV mentioned in another thread as an example: https://www.youtube.com/watch?v=6Ejga4kJUts In TenFourFox7450 17.0.9 without Flash enabled, the video is sluggish but watchable. It plays smoothly after enabling Flash. In Safari with the hacked Flash plug-in, the video is smooth only when I "command-click" its link from this page: https://www.youtube.com/results?search_query=the+cranberries+zombie I use the word "only" because the same video will be very sluggish to the point of unwatchable after I press command-R to reload the video page. Or when I just "click" the link from the search result page, and or when I paste the url, https://www.youtube.com/watch?v=6Ejga4kJUts , into Safari's blank address bar and hit Return. It's very sluggish even at 144P. The ONLY way to make it watchable is "command-Click" from the search result page. It seems YouTube acts differently even though it is the same video in 10.5.8. On the other hand, in 10.4.11, Safari (with the same hacked Flash plug-in) plays the video fine, without this strange issue. I think the issue is on the YouTube side. Since there is no problem with Vimeo. Has anyone experienced this issue?