BinX Song of Intel has submitted a patch to EDK2 with support for Google’s Brotli compression algorithm.
[PATCH 0/4] MdeModulePkg/BaseTools: Add Brotli algorithm support
Brotli algorithm has a little less compress ratio than Lzma, but has better decompress performance than it. Add Brotli algorithm support, include Brotli decompression library and tool set.
Brotli is a generic-purpose lossless compression algorithm that compresses data using a combination of a modern variant of the LZ77 algorithm, Huffman coding and 2nd order context modeling, with a compression ratio comparable to the best currently available general-purpose compression methods. It is similar in speed with deflate but offers more dense compression.
More info:
https://lists.01.org/mailman/listinfo/edk2-devel
https://github.com/google/brotli
https://www.ietf.org/rfc/rfc7932.txt
https://groups.google.com/forum/#!forum/brotli
Firmware Security 