sorl/sorl-thumbnail — pull request #92 by leotsem (2012-03-13 00:16:29+00:00)
Title: thumbnail.exists() is too slow when using S3 as a backend storage

clearly, it's more a django-storages issues than a sorl issue, but in my case, when using S3 as a backend, it took about 60 secons to run thumbnail.exists() so I've removed the check and made the assumption that if the thumbnail does not exist in the cache it does not exist on the disk either. Now it runs under 1 second.