Too Many Entries make Drupal slower or unusable

  // Exported field: field_myfield1
  $fields[] = array(
    'field_name' => 'field_myfield1',
[...]
    'allowed_values' => '',
    'allowed_values_php' => '',
    'widget' => array(
      'rows' => 5,
      'size' => '60',
      '0' => FALSE,
      'default_value' => array(
        '0' => array(
          'value' => '',
          '_error_element' => 'default_value_widget][field_myfield1][0][value',
        ),
      ),
      'default_value_php' => NULL,
      '1' => FALSE,
      '2' => FALSE,
      '3' => FALSE,
      '4' => FALSE,
      '5' => FALSE,
      '6' => FALSE,
      '7' => FALSE,
      '8' => FALSE,
      'label' => '',
      'weight' => '-1',
      'description' => '',
      'type' => 'text_textfield',
      'module' => 'text',
    ),
  );

I'm talking about these entries :

'1' => FALSE,
'2' => FALSE,
'3' => FALSE,
'4' => FALSE,
'5' => FALSE,
'6' => FALSE,
'7' => FALSE,
'8' => FALSE,

These make Drupal slower and for some other feature I have some many entries that make Drupal unusable with a White Page Of Death.

Is someone able to tell me what are these entries for ?

Is someone can tell me how to make feature not generate these entries ?