The goal is to compress images more than 50% better than JPEG in visually lossless quality (freeze planned at 65% better compression efficiency), while decreasing decoding speed only less than 50%.
It uses a combination of two other Google projects with funny Swiss pastry related names: Butteraugli (HVS-aware image differences) and Guetzli (JPEG encoder with denser packing).
Current implementations don't require AVX2 and FMA anymore, but still expect SSE4; this CPU feature threshold may drop further during the development.
So, no hurry yet
