Comment 106 for bug 1083858

I have found the solution to the lagging/frame dropping playback of Netflix under Ubuntu 13.10 (using native Firefox under Ubuntu with pipeline enabled for Silverlight) withe the help of the the following thread:

https://wiki.archlinux.org/index.php/PulseAudio#Realtime_scheduling

This seems to be a Pulseaudio issue. Following the thread, issue the following command:

sudo gedit /etc/pulse/default.pa

Search for the following line:

load-module module-udev-detect tsched=0

and replace it to:

load-module module-udev-detect tsched=1

Save the file in the editor, and playback will be perfect, even with full HD.