New Post: $objReader->load($inputFileName) takes more time.How can i minimize it?

$inputFileName is 1 mb xlxs file takes 45sec only for loading.

$objReader = new PHPExcel_Reader_Excel2007();

$objReader->setReadDataOnly(true);

$objPHPExcel = PHPExcel_IOFactory::load($inputFileName);

checked for execuation time for every line. load function takes 45 sec . How to minimize it?