A little better, but not too much better....

(0) : ** rendered 9063 frames in 2.938 secs, 3084.752 fps, size 18.1 MiB

(5) : ** rendered 9063 frames in 2.202 secs, 4115.804 fps, size 16.1 MiB

(8) : ** rendered 9063 frames in 2.754 secs, 3290.850 fps, size , 15.8 MiB