mcsimport load time is significantly slower than cpimport load time

mcsimport load time is significantly slower than cpimport load time
the greater the data volume to be imported the larger the delay in load time of mcsimport tool in comparison to the cpimport load time.

mcsimport was installed and executed locally on MCS in order to compare load time of the mcsimport tool to cpimport load time excluding the network delay

It would be expected not slower load time achieved by the mcsimport tool in comparison to
cpimport run in mode m1.

notes: tables were loaded one by one ;
raw data was stored locally on attached storage;
mcsimport is installed with mariadb-columnstore-api-cpp and mariadb-columnstore-tools packages;
cpimport comes with mariadb-columnstore installation
it's was run cpimport with mode m1;

used scripts:

PCPIMPORT=/usr/local/mariadb/columnstore/bin/cpimport

MCSIMPORT=/usr/local/mariadb/columnstore/tools/mcsimport/mcsimport

MCSIMPORTXML=/usr/local/mariadb/columnstore/etc/Columnstore.xml

 ${PCPIMPORT} -m1  ${LOAD_DB} ${i%.*}  insert-data-tables/data/${LOAD_DB}/${i}

 ${MCSIMPORT}    ${LOAD_DB}  ${tpc_ds_tbls[i]%.*} insert-data-tables/data/${LOAD_DB}/${tpc_ds_tbls[i]} -d "|" -c ${MCSIMPORTXML} 

load time results from loading 1G and 100G data:

100M data, load times per table: