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Raw converters in general, and PhotoLab in particular, apply sharpening behind the scene, FastRawViewer doesn't. Artificial behind-the-scenes sharpening doesn't help evaluating raw.

That said, you can use display sharpening in FastRawViewer (Menu – View – Screen sharpening (the default shortcut is S) and also through the USM button located on the bottom bar of FastRawViewer). Please have a look at USM controls are explained on

Also, you can have "process raw data on GPU" selected (and use OpenGL as graphics engine) and Preferences – GPU Processing – Image downsampling set to Area resize - please see and