If your display is connected to internal GPU: please force to use internal GPU with FastRawViewer (via NVidia control panel).
Rendering on eGPU results in lot of extra overhead: data uploaded to eGPU, rendered on eGPU then rendering result transferred to iGPU and re-rendered on it in framebuffer (and all transfers are done via 4-lane-max thunderbolt connection).
If your display is connected
If your display is connected to internal GPU: please force to use internal GPU with FastRawViewer (via NVidia control panel).
Rendering on eGPU results in lot of extra overhead: data uploaded to eGPU, rendered on eGPU then rendering result transferred to iGPU and re-rendered on it in framebuffer (and all transfers are done via 4-lane-max thunderbolt connection).
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Alex Tutubalin/FastRawViewer team