Finding out what region3 a part is in

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1

Is there a lightweight way of checking which region3 is containing a part?, that doesn’t involve just checking each one individually?

I’m trying to create a ambiance/lighting sysytem. that allows me to go from bright outdoors to dark and eerie interiors. To do this i’m creating 2 marker objects in a model, with the goal lighting stats, and ambient soundscape in a folder. Enter into the region and your lighting tweens to the goal, and the sound scape fades in. Works great in practice, but i feel like if i have too many “ambience regions” it could start to take a toll on performance.

would checking with a whitelist improve performance? or am I just micro-optimizing unnecessarily?

Right now i have

Function ReturnRegion3(Part)
    for i,Region in pairs(Regions) do
        if workspace:FindPartsInRegion3WithWhiteList(Region,{Part},1)[1] then
            return Region
            Break
        end
    end
end