drupal with lots of modules requires even more memory

drupal/drupal-apache.conf

@@ -83,7 +83,7 @@ php_admin_flag    session.auto_start            off
 php_admin_value   session.save_handler          user
 php_admin_value   session.cache_limiter         none
 php_admin_value   error_reporting               E_ALL&~E_NOTICE
-php_admin_value   memory_limit                  16M
+php_admin_value   memory_limit                  32M
 php_admin_value   mbstring.http_input           pass
 php_admin_value   mbstring.http_output          pass
 php_admin_flag    mbstring.encoding_translation off