How do I increase memory to increase down stream buffer

Netflix runs a quick speed test to determine the bitrate of your stream right before it starts to load the film. That's the "determining your video quality" part after you hit the "Play" button. Once the movie loads, if you press Shift-B on your keyboard (you may have to click in the black area around the movie display first), you should get a small dropdown menu in the bottom right of the browser window, showing bitrates for the different streams available for that title. You'll be able to manually select the stream you want from that list, and the title will reload at that bitrate.