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To take advantage of the modern hardware, in FastRawViewer Preferences, 'GPU Processing', select:

'Graphics Engine' – OpenGL
'Image resampling method' – Bicubic
Downsampling – 'Area resize'
'Process RAW data on GPU' – start with 'Bayer RAW only'

Restart FastRawViewer.

Please see FastRawViewer manual for the explanation of the settings, 'GPU Processing' section starts on p.195.

You can access FastRawViewer manual via FastRawViewer's main Menu -> Help -> PDF Manual. The manual is a standard PDF file, it has a table of contents, and is searchable.