CullPerObjectLights - eats 0.5 ms absolutely for no reason

Hi! I am using deferred rendering; All objects lightmapped; I need direct light only to properly lit normal mapped materials, shadows off.

When I turn direct light on, inside profiler Camera->Culling->CullPerObjectLights starts to eat 0.5 ms;
Even if I set it only to lit, say, some 1 object in scene using culling mask.

What is going on? Any way to avoid such waste of resources?

bump