Hi. You have already tested it. Packet loss isn't normal. 11% is atrocious. Does it happen over 3G/4G? I doubt it, but just want to check.
Latency is really hard to solve.
What router do you have? do you have any switches, repeaters? (including the airport express in extender mode)
I am concerned for those of you that have packet loss. That really is a sign that there is something wrong, and it is measurable, and a perfect thing to show apple.
Does it happen with other routers outside your house? Or just the one you are connected to?
Could those of you not having problems run a test with NetworkCatcher and make sure there is no packet loss on your end? Again, I doubt it, but I'm just checking.
--Sam
P.S Mode can cause all kinds of weird issues. So can encryption type. Make sure mode is set to N or G only depending on router. (if you can do it) what you don't want is "rangemax" mode, or proprietary additions to the standard that supposedly extend range. Encryption type once again should be (TKIP+AES) for maximum flexibility although I have been experimenting with AES only lately with OK results so far.