alt Hacker NewsSounds like a straightforward time-space tradeoff: if you have the compressed layers sitting around when you need them, you can avoid the expense and time of compressing them.
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I'm not sure about the fastest macbook disk access, but even with NVMe storage I've found lz4 to be faster than the disk. That is (it's hard to say this exactly correct) compressed content gets read/written FASTER than uncompressed content because fewer bytes need to transit the disk interface and the CPU is able to compress/decompress significantly faster than data is able to go through whatever disk bus you've got.
But if it stores the uncompressed layers, why store the compressed ones too? Why both at the same time?
did you mean the first "compressed" to be "uncompressed" ?
Why would I need the compressed layers?