The mplayer plugin does not play videos consistently...sometimes it gets stuck at 97% when loading, and does not begin playing the movie until it is 100% loaded...BUT. When it is successful in playing a Youtube video, the playback is very smooth.
I got some great feedback from Biotube at the Debian forums...he felt that the lack of SSE instructions in the Celeron 466Mhz processer might be the root cause. He suggested that VLC knows "how to fall back to x87 instructions" while Flash doesn't. Seems to make sense to me.
At any rate, this might be the catalyst to find a midtower case so I can use a slightly faster motherboard/cpu combo. This Celeron 466 is part of a microATX system from HP, completely non-upgradeable. I have components but no case/power supply for a Pentium III 733Mhz system that should have no problems handling Flash.
Thanks for everyone's help.
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