PanickyMoth78 there is no env var for sdk.google.storage.pool_connections/pool_maxsize . We will likely add these env vars in a future release.
Yes, setting max_workers to 1 would not make a difference. The docs look a bit off, but it is specified that 1: if the upload destination is a cloud provider ('s3', 'gs', 'azure') .
I'm thinking now that the memory issue might also be cause because of the fact that we prepare the zips in the background. Maybe a higher max_workers would consume the zips faster. Might be counter intuitive, but I would try setting max_workers to a higher number.