I have 64-bit Debian on laptop with Intel Core 2 Duo T9300 2.5GHz, Nvidia Quadro NVS140M GPU and 4GB RAM. For now - im on vacation and im using 3G USB modem.
I have relatively slow but high quality stable 80kB/s (640kb/s) connection and it is enough to watch youtube 360p without any problems under Windows 7 on same machine. Youtube player and other video services work perfect, response on my clicks is instant. I also tried to watch youtube on very old 900MHz PIII desktop with same USB modem - no problem at all.
However - under Debian (Iceweasel or Opera) - all video players seem to work very inefficient and most of them freeze my browser for few seconds. Pause button has lag too.
I noticed that my browsers load diffrent youtube player (it's not HTML5 player like under windows).
I also tried to connect my laptop via ethernet to windows computer with shared internet (from same USB modem), so this is not USB modem driver fault.
My GPU is installed correctly and it seem to work with high performance.It deals with modern Gnome with fancy animations without performance problems, but I'm using Gnome Classic because modern one is too buggy when I run OpenGL app in windowed mode.
What can I do to improve youtube performance?
Im really confused that interned browsing on my relatively fast laptop works slower than old 900MHz PIII desktop with Windows XP.