Different implementations are possible. It doesn't have to copy SF's design.
Easy test for you. Compress an mp3 album with WinRAR. Then record the time of copying the album to your SSD and the time of copying the archived file, also. You'll see there won't be any performance loss.
The idea is good, it just has to be implemented well.
The lack of cache is SF's mistake. It can be avoided.
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