pub const AHD_CPU_FACTOR: f64 = 2.3;
The same for the AHD demosaic: on the CPU 2.3x (x86-64, 45 MP Bayer, develop to RGBA8 on one thread), on the GPU 5.2x (Apple M1 Ultra, 24 MP Bayer, kernel time 26 ms against 5 ms).