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The requests downloader used decode_content=False on raw socket reads, which skipped HTTP content-encoding decompression. Subtitle files served with Content-Encoding: gzip were saved as raw compressed bytes, then mangled by try_ensure_utf8 falling back to CP1252 decoding. Remove decode_content=False from the raw read path — the speed gain comes from raw.read() itself, not from skipping decompression. Also add gzip/zlib magic byte detection in try_ensure_utf8 as a safety net for any edge cases where compressed data reaches encoding detection.