How to speed up data insertions from MATLAB to Vertica database

In my project, I have to insert/update millions of records in batches to Vertica database. Currently I'm using datainsert function to insert 3000 records at a time and it takes about 6 seconds for each insert which is too slow when there is a situation of even inserting 1 million or more records. Are there any faster ways to do the insertion from Matlab to Vertica database?