> On S3, for example, it's possible to delete multiple objects within one request (http://docs.aws.amazon.com/AmazonS3/latest/API/multiobjectdeleteapi.html).

I reuse it here: https://github.com/liip/LiipImagineBundle/pull/302/files#diff-a8357f301b798dec1b57ab90f620586eR112