For some time there has been widespread problems with Youtube buffering performance. This affects anyone wanting to distribute or view video content via Youtube. I did some testing, and here are my results.
Symptom: A consistent 24x7 lack of complete buffering on certain videos, independent of network speed or browser. I've tested Chrome 27.0.1453.110, FF 21.0, and IE 10.0.9200.16576 on 64-bit Windows 7 Home Premium SP1, Flash 11.7.700.202. I have Comcast Extreme 105, which on speedtest.net consistently produces 115 megabit/sec down, 21 megabit/sec up. My ping is 19 mS with 1mS