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That's really DEFLATE, the sliding window of standard deflate is 32KB. Both compression and decompression have some overhead (compression more so as you might want to have index tables and whatnot to make finding matcher faster) but even with the worst possible intention there's only so much overhead you can add.



Level 9 uses 128k, if memory serves.

We’re talking about HTTP here, and gzip is the only reliably available compressed transport encoding.

On the plus side, because it is so resource constrained you have had it on your phone for ages, and might even see it on IoT devices.


> Level 9 uses 128k, if memory serves.

That's probably a misunderstanding or misremembering: the DEFLATE format can only encode distances of 32K (the proprietary DEFLATE64 allows 64K distances but not everything supports it).




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