Tablet laggy if Wifi set to sleep

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http://forums.androidcentral.com – Has anyone noticed that since the most recent update to 4.2.2 that when the tablet awakes, even though I'm used to a certain degree of lag, is excessively laggy after waking up? Gmail used to be the main aggressor of the lag with 4.1.2 but I could deal with it. Now once I turn it on it remains laggy for a good 10-15 minutes until gmail finally syncs. I don't really want to leave my wifi on when the tablet is asleep because I burn through battery by the next time I turn it on I've almost depleted the battery or the tablet is dead and needs to be charged. Thoughts? How do you run yours? (HowTos)