I've noticed a bit of latency recently, although I've not correlated it to any particular site or route, and I was, unfortunately, dealing with another issue on my MBP that saw seeing my downloads capped to 20Mbit/s, I stumbled across the solution for that by accident though.
I just ran a trace to the akamai server that was mentioned in this thread.
MOD EDIT - too large image removed and replaced with smaller image.