File uploads can be slow when resumable uploads are used with an S3 file system, see 📌 Support non-locking (ie remote) file systems Needs review . The probleem seems to be the way S3 handles appends to existing files, which is done a lot when a file is uploaded in chunks during a resumable upload.
Use File Resumable Uploads module together with the S3FS module and upload a very large file through the resumable upload widget for a file field that is configured to store the files using the s3:// stream wrapper.
Add the option to upload files to the temporary files folder first and move them to S3 when upload is complete.
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Optionally, we could supply a configuration to switch between direct upload to the stream wrapper for the file field or upload via the temporary files folder.
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Pretty blunt approach that just forces the temporary stream wrapper for the initial upload. For our project this is enough. Shouldn't be too hard to improve upon this and make it configurable whether or not the temporary stream wrapper is used for initial upload.