unipost for parallel netcdf

Dear colleagues,
I use wrf-nmm v4.3 on the cluster, it produces wrf_output files in parallel netcdf format. I also have UPP v3.1.1 for the model outputs postprocessing. The problem is in the very low speed of execution of unipost.exe file (2.5-3 times slower than with ordinary netcdf)!
Can anyone help me to speed up this process?