Sorry to hear this, i think it’s more of a nodeJS issue that you are saying. Bear in mind you can take the plugin and just rework it plug the wholes etc.
I think since NodeJS and JS itself is single threaded I think you will have the same issue regardless.
If you are trying to upload images from one server to a bucket, make sure the server or container has enough resources to deal with the request etc as well.
Though I do understand that this can be a deployment killer if you are doing uploads at the start of the container etc.