I'm using the following code to download a glance image:

```

from glanceapi import client

...

glance = client.Client(GLANCE_API_VERSION, session=sess)

...

with open(path, 'wb') as image_file:

    data = glance.images.data(image_id)

    for chunk in tqdm(data, unit='B', unit_scale=True, unit_divisor=1024):

        image_file.write(chunk)

```

And I get a speed around 3kB/s. It would take months to download an image.

I'm using python3-glanceclient==3.6.0.

I even tried:

```

    for chunk in tqdm(data, unit='B', unit_scale=True, unit_divisor=1024):

        pass

```

to see if the bottleneck was the disk I/O, but didn't get any faster.

In the same environment, when I use the glance CLI instead:

```

glance image-download --file $path $image_id

```

I get hundreds of MB/s download speed, and it finishes in a few minutes.

Is there anything I can do to improve the glanceclient performance?

I'm considering using subprocess.Popen(['glance', 'image-download', ...]) if nothing helps...

Regards,

Lucio