Unhappy [Q] Flashlight takes 5-10 seconds to start

Hi
I'm trying to use numerous flashlight apps and they all have one thing in common.
The flashlight takes between 5-10 seconds to start.

If I start it for the first time after few minutes of idleness, it takes 10-15 seconds.
Afterwards the time decreases to 3-5 seconds

Is this a known issue? any resolution?

I'm using a rooted stock ROM