Loading data from big CSV file is very slow

We have a CSV file that has just over 200,000 rows in it.  I completely understand the time it takes to do the corresponding inserts when it is first run.  However, each subsequent time that liquibase is run through it is hanging on that changeSet for upwards of 5 minutes despite the fact that it has already been run.  I comment out that changeSet and it’s finished in under 60 seconds.  I can only assume that the checksum validation is taking forever for some reason?  Using LiquiBase version 2.0.4.