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Deflate-compressed DNG tiles are written at zlib level 1 instead of 6. Measured on Sony A7R VI files (67 MP), 4 threads, best of 3: - Photo Merge DNG (half floats, 3 channels): 3.88 → 0.55 s, 265.7 → 274.8 MB (+3.4 %) - raw export with Deflate (16-bit CFA): 0.89 → 0.18 s, 96.7 → 103.0 MB (+6.5 %) - rendered DNG: 4.60 → 0.69 s, 239.0 → 267.1 MB (+11.8 %) Lossless either way; both written files decode back bit-exactly. Lossless-JPEG DNGs (the default for convert/import) are unchanged. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>