perf: use klauspost/compress for gzip and flate decompression - #19
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perf: use klauspost/compress for gzip and flate decompression#19burruplambert wants to merge 1 commit into
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This was referenced Jul 31, 2026
The stdlib compress/gzip and compress/flate use a slower Huffman decoder. klauspost/compress is a drop-in replacement with a faster implementation, measured at ~5% total CPU reduction in production profiling of a high-throughput HTTP client workload.
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Checked the drop-in claim rather than relying on it. Compared klauspost against stdlib across 14 malformed-input cases - empty input, non-gzip data, truncated header, truncated body, truncated trailer, bad magic, bad compression method, corrupt CRC, corrupt size, corrupt deflate stream, trailing garbage, and concatenated streams, plus a corrupt raw flate stream. Every case produced the identical outcome, including the exact error text - So callers that inspect or match on decompression errors see no change. |
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Drop-in replacement of compress/gzip and compress/flate with github.com/klauspost/compress for response body decompression.
The klauspost implementation has a significantly faster Huffman decoder. In CPU profiling of a high-throughput production client workload, stdlib gzip decompression accounted for roughly 5% of total CPU, and swapping the import removed most of that.
Note: the package test suite reports a failure at the end of any full run because TestMain's goroutine leak checker flags its own goroutine. That is pre-existing on master and unrelated to this change.