[pzstd] Reduce memory usage to 60-75% of previous
[pzstd] Reduce memory usage to 60-75% of previous

ds77/zstd,Cyan4973/zstd,inikep/zstd,Majlen/zstd,Cyan4973/zstd,Majlen/zstd,Cyan4973/zstd,Majlen/zstd,ds77/zstd,inikep/zstd,ds77/zstd,inikep/zstd,Cyan4973/zstd,inikep/zstd,Majlen/zstd,Cyan4973/zstd,ds77/zstd