gsutil rsync hangs on large files

Hi! We are using `gsutil rsync` to upload our backups to coldline storage. After our files become larger (more than 30GB) `rsync` starts hanging on each such file. The same situation is for `gsutil cp`.
I've already sent a log file with `gsutil -D rsync` to gs-team@google.com
```
gsutil version: 4.25
boto version: 2.42.0
python version: 2.7.12 (default, Nov 19 2016, 06:48:10) [GCC 5.4.0 20160609]
OS: Linux 4.4.0-77-generic
multiprocessing available: True
using cloud sdk: True
config path(s): /etc/boto.cfg
gsutil path: /usr/lib/google-cloud-sdk/platform/gsutil/gsutil
compiled crcmod: True
installed via package manager: False
editable install: False
```