I guess it&#x27;s yet another optimised LZ variant, and it&#x27;s no surprise that LZ-based&#x2F;inspired algorithms are fast, because their main loop is very simple and does not involve the intense bit manipulation of Huffman&#x2F;Arithmetic algorithms. That&#x27;s how very carefully optimised LZ can end up being <i>faster than memcpy()</i> in some cases:<p><a href="http:&#x2F;&#x2F;www.oldskool.org&#x2F;pc&#x2F;lz4_8088" rel="nofollow">http:&#x2F;&#x2F;www.oldskool.org&#x2F;pc&#x2F;lz4_8088</a>