It already took place a few weeks ago, but there were some great talks at the Chrome Dev Summit 2013, especially on browser and web performance. Fortunately there are two video recordings available, so we who haven't been there can watch the talks and I can only recommend them!
Have a look at the summit schedule to find the talks you"re interested in, since both videos (unfortunately, but not complaining!) are in one piece, roughly 8 hours each.
My favorites (in no particular order):