lzturbo (Hamid Buzidi, LZ+tANS)- focused on speed in large range of compression levels: https://sites.google.com/site/powturbo/
This among the fastest ? Is this also user friendly allows user input multiplicities values of distinct input symbols to compress ? barest minimum possible Header in compressed file ( just minimally the input multiplicity values of distinct symbols in input file to be compressed ) ? Integrable within C# ( call C++ / C etc within C# )
Likewise allows user input multiplicities values of distinct input symbols to decompress ?
Otherwise any other recommendations ?