Could you please provide details regarding your environment resources? Are you operating your production environment using the Docker image?

I conducted a test by uploading 30 images, each sized at 10M, and the process was quite swift in my local development environment, taking approximately 30 seconds. It is important to note that this was executed in a local Docker environment, as opposed to my non-docker environment hosted in the cloud.

for i in {1..30}; do dd if=/dev/zero of=test-$i.jpg  bs=10M  count=1; done

I suspect that the issue may lie with the host environment rather than the source code or Docker itself, given that the upload completed after 45 minutes. I would not have anticipated such a lengthy duration for an upload of this size. I performed the same test in my cloud environment, which was indeed slower, leading me to wonder if your issue is related to the local environment or the production environment hosted elsewhere, potentially involving other components such as networking that the images must traverse. For your information, I exclusively utilize the synchronization method to transfer my images, employing rsync to the environment, and I seldom, if ever, utilize the web-based uploader for bulk uploads of this nature.

I'm curious what your ISP bandwidth upload is? Remember that 1 MB = 8 Mbit.

speedtest.net