Debuging project with gDEBugger

hi folks
I try figure out with debugging though gDEBugger.
I find strange biggest texture in my project 2048x3072 (12mb)
Actually i do not create this texture.
What’s is this?

and others expected textures

That’s a point light shadow map with 6 sides unrolled. Probably you could lower the shadow quality for any point lights you use.

Now i understood, thanks
I guessing this value set ratio for this kind maps

after changing this from 1 to 0.5 it become twice smaller

And other question:
Am I right? What application in most time spent in calling this two function again and again ?