[FFmpeg-user] Why minterpolate operation is very slow on my ffmpeg?

I tried to use minterpolate='mi_mode=mci:mc_mode=aobmc:vsbmc=1:fps=60, but have a very slow encoding speed=, 0.0xxx If I tried to use mi_mode=blend it will be more faster, but I don't like this method, because it isn't liek to me.. What problem with aobmc mode, and how I can to encrease processing operation speed? Thanks dd.