The build from git is OK. I tried flac with compression 0 and 5 and
then also the new alac:

FLAC

** rendered 26152 frames in 1.448 secs, 18060.773 fps, size 63 MiB
(compression 0)

** rendered 26152 frames in 1.650 secs, 15849.697 fps, Size 57.8 MiB
(compression 5)

This time the result is in line with yours.

Andrea, in most of my tests, I always did compression level 0 first which meant that my audio was not already loaded into memory. Then I did level 5 and now it WAS already loaded into memory. That may have been your case too.

ALAC

** rendered 26152 frames in 2.766 secs, 9454.808 fps, size 138 MiB (mkv)

** rendered 26152 frames in 2.664 secs, 9816.817 fps, size 138 MiB (qt)

Since ALAC is a pro and lossless format, I have modified the manual
page to reflect this.

Thank you. I checked your change into GIT.