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Yes normal, it's to wait and see if you are double pressing to open Vlingo.
when ur phone is in sleep mode, it takes 1-2 seconds to wake up and screen on. im not sure if its to check if ur double tapping to open vlingo or somethign else but thats how it is. its annoying i know. i usually hate the iphone comparisons, but seriously, iphone also has a double tap feature and it still wakes up from sleep instantly.
the reason ur phone wakes up instantly when u just lock it is coz it hasnt gone to sleep mode yet.. and when its charging, maybe ur usb connection was active and it wasnt in sleep mode either. if its in sleep, low battery or full battery, ur gonna get that 1-2 seconds lag, the famous lockscreen lag. ive been waiting on firmware to fix it, and i think KG5 has improved it (im probably imagining) but its definitely not instant