Processing speed due to the decompression algorithm or the I&#x2F;O?<p>You can get another 10% with gzip -7 vs the default I bet.<p>I don&#x27;t find the compression&#x2F;decompression the bottleneck in most of this work and even then an extra 10% isn&#x27;t worth sacrificing the interoperability between all the systems that support .json.gz<p>Higher gzip levels I think only really affect the compression step -- decompression is the same cost.  These are mostly write-once read many times sorts of datasets.