ppmd will get you better compression on text (better than zstd and even better than lzma), but it is slow to compress and decompress. Use `7z a -m0=PPMd demo.7z

ppmd will get you better compression on text (better than zstd and even better than lzma), but it is slow to compress and decompress. Use `7z a -m0=PPMd demo.7z demo.txt`