@snotling Perhaps we can optimize jclouds MPU by using GCS simpleUpload in SequentialMultipartUploadStrategy? The second metadata part in GCS multipartUpload does not seem required since compose takes a metadata parameter.
I'm not sure whether it is possible. Resumable Uploads may be useful. It is implemented in feature API --- Reply to this email directly or view it on GitHub: https://github.com/jclouds/jclouds-labs-google/pull/131#issuecomment-86721837
