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FastRawViewer uses GPU that provided by system, there is no specific GPU-selection code in the program.

For Dual-GPU case it may result in  one GPU assigned to FRV while other GPU is used by system for windows drawing. In that case:

  - FRV draws itself on one GPU (in framebuffer)

  - system copies this framebuffer into second GPU graphics memory

  - and redraws it on screen.

This might be slow.



If your system allows explicit application-GPU assignment try to assign FRV to another GPU.