Many users may find that Flash animation in GTK-2.x+ build of Mozilla / Firefox to be very slow, here is what you can do to work around it:

1. Speeding up Flash animation for GTK-2.x+ build (and 2.x+ build only) of Mozilla or Firefox:

-> From Mozilla bug #219625
Just export this environment before starting Mozilla / Firefox:

You can add this line to the execute script such as "firefox.sh", so it will be exported by default.

2. BTW, a new Linux Flash plugin update is released, 6.0 r81:

# [LinuxFlash] flash-plugin-6.0.81 Update
# Macromedia Linux FlashPlayer download

Flash plugin 6.0r81 no longer depends on the old (gcc 2.96) version of libstdc++.

3. Also, it looks like FlashPlayer 7 for Linux Beta is coming:

http://www.markme.com/mesh/archives/004504.cfm

Note: This is re-posted from PCLinuxOnline.

it didn't seem to make much difference here....some Flash stuff runs okay anyway, but the really important stuff (like homestarrunner) continues to play audio out of sync with the video. The standalone player is a ton better than the plugin, with or without this fix.

Thanks for the news on v7...I've been anxiously awaiting this.

export FLASH_GTK_LIBRARY=libgtk-x11-2.0.so.0

before launching Mozilla GTK2 build will provide the speed boost in Flash animation; this trick does not help GTK1.2+ build, however.

BTW, the new 6.0r81 plugin does fix a couple Flash related bugs:
http://plugindoc.mozdev.org/faqs/fla...l#linux-issues

Update:
This trick is no longer needed with Linux Flash plugin 7.0 r25.

The slow animation performance is fixed with this new plugin, regardless of the gtk version of your Mozilla browser.