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this post was submitted on 07 Dec 2023
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@8rhn6t6s There are some caching which need to be enabled with the protondrive rclone mounting. But it is still slow.
Remember that non-E2EE storages (such as Google Drive, AWS/S3, etc) can do the upload a lot faster as a starting point, as there is no client-side encryption of the data being uploaded (and the reverse; decrypting downloaded data). This decryption/encryption happens in the protondrive "module" in rclone. On top of that comes that files are split up into "chunks" which are transferred via separate HTTP calls. And I have no idea (aka "have not read the code) how the unlock key of the PGP key is handled in rclone. All of these things combined together impacts the performance.
That said, I've had a quick test on a Windows computer with Proton Drive installed. It wasn't blazingly fast there as well, but still felt faster than rclone.
My guess is that it's partly that the rclone implementation has room for improvements on how the Proton Drive server-side APIs are called and some of it is related to crypto implementation performance.
For example, I dunno if the Proton Drive APIs support HTTP/2 protocol or QUIC ... And I dunno if the rclone supports them as well. Just in this aspect there are lots of room to cut down on the "connection handshake" as HTTP/2 and QUIC supports more efficient handshakes and can also have multiple streams sending data in parallel - using a single handshake. If the native Proton Drive app on Windows implements this, that may explain some of the performance differences.