Note he also expects a worse compression as tradeoff. I think he implements RLE in terms of zlib: [...]Deflate compressor which was optimized for simplicity

Note he also expects a worse compression as tradeoff. I think he implements RLE in terms of zlib: [...]Deflate compressor which was optimized for simplicity over high ratios. The "parser" only supports RLE matches using a match distance of 3/4 bytes, [...]