Snapshots Compression

What is the difference if I toggle switch On the Snapshot Compression? What's the difference when I leave it as Off? Does it any make sense?

it will be applied only to metadata (like index mapping and settings) but not to the data as it's already compressed. so nothing to gain with this option

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Oh, but how about the other options below? it seems not useful too i.e Chunk size, Max snapshot bytes per second, Max restore bytes per second, etc. As I read the documentation/google, they don't suggest to use it, nothing mentioned when to use them, so I'm kind of confused.