Hi,

After migrating a project from 2.7 to 3.0 I noticed that loading fixtures and my test suite became really slow (PHP 5.6.20). A blackfire profiling on bin/console doctrine:fixtures:load -n --env=test shows that iconv_* is responsible :

The fixtures loaded are only 20 entities but each one stores a 100ko xml in database.

On 2.7, mb_strlen wasn't slowed by the size of the data :

In the mean time I can disable logging & profiling on DBAL for test env via config_test.yml but it is quite penalizing.