: Modifying or adding files to a solid archive is inefficient. 7-Zip often has to re-compress the entire block or archive to apply changes.
: By default, 7z often uses a 2GB block. For maximum efficiency on huge datasets, you can set this to "Solid" (one block for the whole archive), but for better balance, limited block sizes (e.g., 128MB or 1GB) allow faster access to individual files. Gf1 7z
: Ensure your dictionary size is large enough to fit your most common file sizes; otherwise, the "window" slides and loses similarity context. : Modifying or adding files to a solid