PHP insert performance

  I have run the series of INSERT tests in PHP for monetdb and SAP SQLAnywhere.  The tests show: performance of the monetdb on INSERT operations is almost twice slower against SQLA with the equal conditions (DDL, index, data, autocommit, 10K records), monetdb is in in-memory mode . What can be a reason?   p.s. It is not benchmark, I just used the SQLA test server already running.      -- - -