The difference is size probably come from suboptimalities which were repaired after open-sourcing: http://encode.ru/threads/2221-LZFSE-New-Apple-Data-Compressio

The difference is size probably come from suboptimalities which were repaired after open-sourcing: http://encode.ru/threads/2221-LZFSE-New-Apple-Data-Compression?p=48489&viewfull=1#post48489 http://encode.ru/threads/2221-LZFSE-New-Apple-Data-Compressi... The difference in speed is more surprising, it could come from using a different compiler - there can be really large differences.