Looking At The Linux Performance Two Years After Spectre / Meltdown Mitigations
The Darktable RAW photography software's impact from the default mitigations.
The GEGL test profile was recently added for this library most notably used by GIMP but also other imaging applications. The GEGL impact on these default mitigations is quite clear.
Running tests on GIMP itself continue to show clear differences in performance from the default mitigations.