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Help with dual monitors?

Jul 2, 2015
Lightroom Experience
Power User
Lightroom Version
I have the same issue. Lightroom doesn't use the GPU for the secondary monitor. I have two 5k displays and if I use the second one, its okay but slows progressivly throught the day. If I try to use the develop module without first turning off the secondary display, things quickly grind to a halt. It is amazing to me that they haven't worked out this yet. It seems like lightroom was a classic case of how dual monitors can improve workflow yet they don't support the GPU on the second one. Why not? Is there a technical limitation or just they haven't addressed it?
Of course Lightroom supports the GPU on the second monitor. How else could that monitor show any image at all? What you probably mean is that Lightroom does not use the GPU for other things (speeding up the develop module) anymore if the two monitors take all the GPU power and memory. That makes sense, I suppose. I've used Lightroom with two 4K monitors on an eGPU with no issues at all.