Symfony : Doctrine data fixture : how to handle large csv file?

I am trying to insert (in a mySQL database) datas from a "large" CSV file (3Mo / 37000 lines / 7 columns) using doctrine data fixtures.

The process is very slow and at this time I could not succeed (may be I had to wait a little bit more).

I suppose that doctrine data fixtures are not intended to manage such amount of datas ? Maybe the solution should be to import directly my csv into database ?

Any idea of how to proceed ?

Here is the code :

<?php

namespace FBN\GuideBundle\DataFixtures\ORM;

use Doctrine\Common\DataFixtures\AbstractFixture;
use Doctrine\Common\DataFixtures\OrderedFixtureInterface;
use Doctrine\Common\Persistence\ObjectManager;
use FBN\GuideBundle\Entity\CoordinatesFRCity as CoordFRCity;

class CoordinatesFRCity extends AbstractFixture implements OrderedFixtureInterface
{
    public function load(ObjectManager $manager)
    {
        $csv = fopen(dirname(__FILE__).'/Resources/Coordinates/CoordinatesFRCity.csv', 'r');

        $i = 0;

        while (!feof($csv)) {
            $line = fgetcsv($csv);

            $coordinatesfrcity[$i] = new CoordFRCity();
            $coordinatesfrcity[$i]->setAreaPre2016($line[0]);
            $coordinatesfrcity[$i]->setAreaPost2016($line[1]);
            $coordinatesfrcity[$i]->setDeptNum($line[2]);
            $coordinatesfrcity[$i]->setDeptName($line[3]);
            $coordinatesfrcity[$i]->setdistrict($line[4]);
            $coordinatesfrcity[$i]->setpostCode($line[5]);
            $coordinatesfrcity[$i]->setCity($line[6]);

            $manager->persist($coordinatesfrcity[$i]);

            $this->addReference('coordinatesfrcity-'.$i, $coordinatesfrcity[$i]);


            $i = $i + 1;
        }

        fclose($csv);

        $manager->flush();
    }

    public function getOrder()
    {
        return 1;
    }
}