Bug#439643: fretsonfire: frets is now very slow!

[giggz]

Here are the warnings of the .fretsonfire/fretsonfire.log :

(W) PyOGG not found. OGG files will be fully decoded prior to playing;
expect absurd memory usage.
(W) PyAmanith not found, SVG support disabled.
(W) Video setup failed. Trying without antialiasing.
(W) Unable to enable psyco.
(W) Unable to load guitar track: global name 'StreamingOggSound' is not
defined
(W) Unable to load guitar track: global name 'StreamingOggSound' is not
defined
(W) Unable to load guitar track: global name 'StreamingOggSound' is not
defined
(W) Unable to load guitar track: global name 'StreamingOggSound' is not
defined
(W) Unable to load guitar track: global name 'StreamingOggSound' is not
defined
(W) Unable to load guitar track: global name 'StreamingOggSound' is not
defined
(W) Unable to load guitar track: global name 'StreamingOggSound' is not
defined
(W) Unable to load guitar track: global name 'StreamingOggSound' is not
defined
(W) Unable to load guitar track: global name 'StreamingOggSound' is not
defined

vorbis-tools is installed on my system...
If anyone have an idea...

Thx
Regards,
GUillaume