Photo Load (0.0ms)  SELECT `photos`.*, `photos`.`id` FROM `photos` INNER JOIN `favorite_photos` ON `photos`.id = `favorite_photos`.photo_id WHERE `photos`.`id` = 45 AND ((`favorite_photos`.user_id = 1)) LIMIT 1
  Photo Load (0.0ms)  SELECT `photos`.*, `photos`.`id` FROM `photos` INNER JOIN `favorite_photos` ON `photos`.id = `favorite_photos`.photo_id WHERE `photos`.`id` = 94 AND ((`favorite_photos`.user_id = 1)) LIMIT 1
  Photo Load (0.0ms)  SELECT `photos`.*, `photos`.`id` FROM `photos` INNER JOIN `favorite_photos` ON `photos`.id = `favorite_photos`.photo_id WHERE `photos`.`id` = 491 AND ((`favorite_photos`.user_id = 1)) LIMIT 1
  Photo Load (0.0ms)  SELECT `photos`.*, `photos`.`id` FROM `photos` INNER JOIN `favorite_photos` ON `photos`.id = `favorite_photos`.photo_id WHERE `photos`.`id` = 454 AND ((`favorite_photos`.user_id = 1)) LIMIT 1
Rendered layouts/_notices.html.erb (0.5ms)
Rendered layouts/_header.html.erb (6.9ms)
Rendered layouts/_footer.html.erb (1.4ms)
Rendered photos/list.html.erb within layouts/application (1635.3ms)
Completed 200 OK in 1795ms (Views: 1614.9ms | ActiveRecord: 24.1ms)

If I remove lines 6-9:
Rendered photos/list.html.erb within layouts/application (635.3ms)
Completed 200 OK in 762ms (Views: 638.4ms | ActiveRecord: 0.5ms)