What I am seeing is that when trying to connect to any wifi network it takes 2 min or more to connect. Sometimes it won't connect at all and I end up shutting off the wifi and restarting it.
sounds like something a GeniusBar might take a look at... and if it can be replicated, warranty replacement would apply.
My WiFi connection can take very long (a whole minute) to resume after waking up my rMBP.
Issue appeared after upgrading to Mavericks.
It is annoying since the Air shuts the wifi off when the screen goes dark.
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This happens after i got the mavericks and i hate it