If we are talking only about open source, then RawTherapee. It's faster than the darkroom. Better UI. But unfortunately they both lose to a commercial software which is usually much faster in most processing/decoding scenarios. Personally I prefer to pay for a software which does its job well. Why not? Image editing isn't that tool which must be only open source. :)
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"Any other photo software are way ahead of this editor in terms of UI and performance, so I don't understand why this one gets so much attention."
Can you name a few open source ones? I'm not aware of any open source RAW development software that comes close.
If we are talking only about open source, then RawTherapee. It's faster than the darkroom. Better UI. But unfortunately they both lose to a commercial software which is usually much faster in most processing/decoding scenarios. Personally I prefer to pay for a software which does its job well. Why not? Image editing isn't that tool which must be only open source. :)