Now I haven’t actually got around to trying find these myself: 1.5.4 was working just fine for me and I couldn’t see anything that the 1.5.6 update would give me until I get OS X 10.5 (and that’s not likely until Aperture is properly supported there[1]) but others have found this information and posted them in the old 1.5.2 and 1.5.4 threads, so I thought it would be helpful to make a more Google friendly URL.
All of the credit for these values goes to Thao Nguyen and Paul (I can verify that only the first of Thao’s values is required for my dual 867MHz MDD as it has a hacked Radeon 9800 and 2GB of RAM so the video check and plist mods aren’t required).
Thao suggests:
0xbf08: 40 9E 00 88 -> 48 00 00 88
0xbfa4: 40 9E 00 88 -> 48 00 00 88
0xc0a4: 40 9E 00 6C -> 48 00 00 64
Paul suggests:
0xbf08: 40 9E 00 88 -> 48 00 00 80
0xbfa4: 40 9E 00 88 -> 48 00 00 80
Of course, having applied the change I now feel that 1.5.6 is faster than 1.5.4, but I can’t say how much of that is down to the usual problem of “newer must be better”…
[1] Hint, hint, Apple: stop making the Aperture library a 3rd-class citizen compared to iPhoto, and give us the full Time Machine whizziness too please. Feel free to make this part of Aperture 2 (including vignetting), of course !