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Your iMac may not have shipped with the most recent version of Flash.
Try uninstalling and reinstalling Flash.
Uninstall Flash Player Plugin
Reinstall a new copy of the Flasy Plugin
And Safari maintenance ...
From the Safari Menu Bar, click Safari / Empty Cache. When you are done with that...
from the Safari Menu Bar, click Safari / Reset Safari. Select the top 5 buttons and click Reset.
Safari add-ons can cause performance issues or other situations
And... right or control click the Safari app in the Applications folder then click Get Info. In the Get Info window click the black disclosure triangle so that it faces down under: General Make sure: Run in 32-bit mode is selected.
Repair disk permissions:
Quit any open applications/programs. Launch Disk Utility. (Applications/Utilities) Select MacintoshHD in the panel on the left, select the FirstAid tab. Click: Repair Disk Permissions. When it's finished from the Menu Bar, Quit Disk Utility and restart your Mac. If you see a long list of "messages" in the permissions window, it's ok. That can be ignored. As long as you see, "Permissions Repair Complete" when it's finished... you're done. Quit Disk Utility and restart your Mac.
If only it was that simple...
Unfortunately it isn't.
I'm having the same problem in here. Take a look at these photos comparing my MBP and my Imac 27" activity monitor while in youtube playing the same video.
Apple: We demand an answer NOW!!! This is Ridiculous! I am a user since performa 6400 and never seen nothing like this in all this years! Jobs do something!!
Clearly this is an Airport driver issue - SO at this point you can:
1) When you notice symptoms of a slowdown, turn off your AirPort off then back on (Annoying yes, but takes <5 seconds) - Wait until an update released by Apple.
2) Get a copy of retail Snow Leopard install disc and reinstall from that (The older drivers aren't affected).
3) Connect your iMac directly to your router.
I have tested all three and they all resolved the issue. My new iMacs are now running perfectly without any slow downs.
wow... I was about to convert over from a pc to a mac for the first time, but after reading this I don't know anymore. I just wanted a faster computer for graphic / video work. I know pc's have problems, but being a lifetime user, I can fix most of those. If something as simple as flash is giving it problems, I will stick to pc's... my 7 yr old pc running xp can play youtube, or hulu files all day with no problems.. I think I will wait it out, or get a pc with tons more power for the same money.
Those with flash issues might want to try the following :
- use Safari instead of Firefox.
This is what I use on Wifi (802.11n) at least until 10.6.2 comes out.
Looks like Apple just released the Mac OS X 10.6.2 update. Looks like it addresses this issue with flash video playback on the new iMacs
Please see if you can follow this best practice for the update:
• Complete a full Time Machine update.
• Ensure all Apple applications are in their default locations e.g., Safari and Mail are in /Applications etc.
• Quit all applications.
• Run software update from the apple menu to start the Mac OS X 10.6.2 upgrade.
Good news! I hope those people who are considering switching to the Mac were still hanging around this thread and saw you were able to fix the problem via a OS X software upgrade. Perhaps it's time for you to indicate the problem is solved and they might notice the STAR in the forum message header indicating the problem is resolved.