bzip3

[Vortex]

A better, faster and stronger spiritual successor to BZip2. Features higher compression ratios and better performance thanks to a order-0 context mixing entropy coder, a fast Burrows-Wheeler transform code making use of suffix arrays and a RLE with Lempel Ziv+Prediction pass based on LZ77-style string matching and PPM-style context modeling.

Like its ancestor, BZip3 excels at compressing text or code.

https://github.com/kspalaiologos/bzip3

[frankie]

Interesting 

[TimoVJL]

Sadly pocc x64 have problems with optimizations.

[John Z]

Sadly pocc x64 have problems with optimizations.

Agree, it is hit or miss sometimes.  If you can narrow the issue to a module
  #pragma optimize( none )  at the top
can be used to exclude just that code module from global optimization.  I've had to do that in a program or two.

The optimization, to me at least, is opaque. Could be helpful if there was a verbose report on
the optimizer actions.  This might point to a coding style that fails to optimize correctly ??

John Z