parallelization of I-TASSER5.1 for stand-alone running

Hi,
I currently try to use I-TASSER stand-alone version to generate the 3D model from sequence of some peptide. The initial step of I-TASSER5.1 invoke the blastpgp command but I found it actually running on 1 core, and be extremely time-consuming. I wonder whether I got something wrong in the set-up of running parallel.
Or do we need to do any extra-set-up to run in parallel.
Thank you a lot.