Madlib Slow?

Hi!

I have compiled the madlib and tried to decode MPEG2 frames on a armv4 chip 
(AT91RM9200) with processor clock ~180 MHz but it seems too slow.
I need to decode a MPEG2 (layerII) frame (say 224kHz) each 24 ms.

I have cross-compiled the madlib with the following configuration

CC=arm-elf-gcc RANLIB=arm-elf-ranlib LD=arm-elf-ld AR=arm-elf-ar ../mad- 
0.14.2b/configure --enable-speed --enable-fpm=arm --disable-nls --disable- 
mmap --disable-debugging --host=arm-elf arm-elf

Correct configuration to enable speed or can I try something else?

Is any body sucessfully running this on this processor or similar?

/Tomas