Per my previous post:
Current master + PR12605 darktable 4.1.0+483~gee07a9f21
Ryzen 5600G 16Gb Nvidia 3060 12Gb
Export of Canon 60D image with my default processing in all 3 tests
Fedora 36 KDE X11 - 2.064 sec - 61.208044 [export] creating pixelpipe took 0.064 secs (0.082 CPU)61.213031 [de - Pastebin.com
Windows 11 GPU - 2.692 sec 33.145194 [export] creating pixelpipe took 0.150 secs (0.141 CPU)33.150333 [de - Pastebin.com
Windows 11 CPU only - 20.23secs 17.754234 [export] creating pixelpipe took 0.144 secs (0.156 CPU)17.759793 [de - Pastebin.com
The GPU is a 10x factor with the modules I use. Your results may vary depending on raw file size and modules you use.