Thanks for the additional reports.
There is a problem somewhere on the "route" on the network between comcast and our server (each little "packet" of info from YLF jumps between about 20 servers on the Internet before it arrives in your browser). It is not actually a problem on our server itself, which is why many people are seeing normal performance.
There are probably many servers on the Internet affected, but the likelihood that you use more than one of them is very low. Hence YLF being the only one you see affected.
The people that host our servers are working on routing around the problem, and they tell me it will take them a few more hours.