If the phone is rooted..... Get the Setcpu app.... Create a profile / hit the + sign / choose app / camera / keep turning up the min and max until it has no lag. Make sure you enable profiles and set on boot. Hope it helps
The "picture stabilization" in settings Also slows down actual picture taking. While handy for no flash pictures, it can be a bit excessive for the actual shutter time. Shut that off, and you got near instant pictures
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