Yeah, basic rule #1 - never use "volumetric world".  ;o)

HDRI - pretty much moot if you have an indoor scene with walls and ceilings, imo. That kind of scene wouldn't benefit from hdri. I mean you already have a full enviroment for reflections, trnsparencies and refractions. And, in real life, in an indoor room, there would be lamps/candles and such somewhere, just place spots and radials there.

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