ARM11 + Frame buffer = too slow

[X-h]

I tried VLC on an ARM11 using frame buffer.
I played a mpeg4 but :

ffmpeg error: more than 5 seconds of late video -> dropping frame (computer too slow ?)
ffmpeg error: more than 5 seconds of late video -> dropping frame (computer too slow ?)
ffmpeg error: more than 5 seconds of late video -> dropping frame (computer too slow ?)

the video stop few secondes and play again for one second...

I know the hardware is capable of better as I tried the video player from qtopia, the video is smouth but a bit too slow.

Maybe I can use better option when I build ffmpeg or vlc ?
ffmpeg :

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./configure --cross-prefix=arm-none-linux-gnueabi- --enable-memalign-hack --arch=armv4l --enable-static --disable-shared \ --disable-encoders \ --disable-decoders \ --disable-parsers \ --disable-muxers \ --disable-demuxers \ --enable-gpl \ --enable-pp \ --enable-decoder=mpeg4 \ --enable-parser=mpeg4video

vlc:

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./configure --host=${host} --prefix=/home/xavier/arm-linux \ --disable-mad \ --disable-a52 \ --disable-libmpeg2 \ --disable-hal \ --disable-dbus \ --disable-dvdnav \ --disable-libcddb \ --disable-x11 \ --disable-glx \ --disable-xvideo \ --disable-xinerama \ --disable-opengl \ --disable-screen \ --disable-bonjour \ --disable-qt4 \ --disable-skins2 \ --disable-taglib \ --disable-freetype \ --disable-lua \ --with-ffmpeg-tree=../ffmpeg

Is DirectFB faster too ?