If these values are of any interest, we should perhaps collect them in a table for a better overview. Maybe we can even combine this with GPU benchmarks in darktable.
From my testings (n=3 and CPU only) I get these values:
Intel i5-3210M (2 cores/4 threads with 2.5–3.1 GHz, Linux Mint 18.3): 50 s
Intel i5-4590 (4 cores/4 threads with 3.3–3.7 GHz, Windows 7): 37 s
AMD Ryzen 3 2200G (4 cores/4 threads with 3.5–3.7 GHz, Linux Solus 4.1): 28 s
Note: OpenCL via Beignet on the integrated HD 4600 of the i5-4590 slows it down to 47 s.
Despite the numbers indicating a roughly twofold increase from the mobile i5 to the Ryzen, I found darktable sometimes not very ‘fluid’. Unfortunatly OpenCL isn’t supported on the Ryzen under Solus, but I guess it won’t make a huge difference.
Especially switching between developed RAWs to compare them in fullscreen takes some time until they appear sharp (on a 1680 x 1050 screen). And while improved and new modules are nice, they are often quite heavy on the computational side.