Photoshop 7.01 is running reasonably reliably, so I ran PS7Bench, a Photoshop benchmarking action script that creates a 50MB file and performs some typical and not so typical filtres and functions. I ran 12 of the 21 PS7bench scripts because it was just taking too long, and the pattern was well established anyway.
Using the following build: ppc-g4-athlonxp-sdl-20040828-1800-tekmaven
with Panther on a dual opteron 246.
The System Profiler shows my setup as a 1.06GHz G4, so I compared my results to an actual 1GHz G4.
Times are in seconds.
PearPC/G4 1000
Rotate 90, 7.4/1.7
Rotate 9 , 94.2/8.2
Rotate 0.9, 90.8/7.6
gaussian blur 1, 38.2/3.8
gaussian blur 3.7, 75.8/7.6
gaussian blur 85, 116.0/9.6
unsharp 50-1-0, 41.2/6.2
unsharp 50-3-7, 79.0/9.8
unsharp 50-10-5, 109/10.2
despeckle, 95.4/4.3
RGB>CMYK, 57.5/10.4
reduce size 60%, 50.6/3.3
In this test, the emulated G4 is as little as 4X slower, and as much as 22X slower than an actual 1GHz G4.
The average slowdown is 10.5X
The slowdown of PS7Bench vs the host machine (dual Opteron)ranges from 24X to 130X, with an average slowdown of 68X.
I think this small test is consistent with other speed claims.