"LZFSE" most likely refers to a Lempel-Ziv modeling phase that converts the input bytes into a series of either literal or copy instructions, followed by a Fini

"LZFSE" most likely refers to a Lempel-Ziv modeling phase that converts the input bytes into a series of either literal or copy instructions, followed by a Finite-State-Entropy encoding scheme which "provides the same level of performance as [an] Arithmetic coder, but only requires additions, masks, and shifts". Here's some explanation of FSE: http://fastcompression.blogspot.com.au/2013/12/finite-state-entropy-new-breed-of.html http://fastcompression.blogspot.com.au/2013/12/finite-state-...