To have 0 sec wakeup lag, use SOFT LOCKER, it's free on playstore. Install and enable it.
To reduce this lag more than 60% (as the previous option eats your battery a bit more but not that much), from exposed app/dpi settings enable RESIDENT on both
Don't forget to save changes before you closed exposed app settings.
Sent from my GT-N7100 using XDA Premium 4 mobile app
Using GT P-1000
HTC HD with GB 2.37
Galaxy Tab 3