Elle.7z

: While it saves space, updating or extracting a single file from the middle of a large solid archive can be slower, as the software may need to decode the preceding data first. Performance & Configuration Tips

: Ideal for archiving large sets of similar binary files where space is at a premium.

7-Zip / Discussion / Help: 7-zIp And Compression Noob - SourceForge Elle.7z

: Best for files you don't need to access frequently, as individual file extraction is slower than in non-solid archives.

Solid compression is most effective when you are archiving a large number of very similar files, such as multiple versions of a document or software backups. Instead of compressing each file individually, 7-Zip looks for redundancies across all files in the "solid block." : While it saves space, updating or extracting

: For maximum efficiency, the solid block size should be at least as large as the total size of the input data. For example, if you have 8GB of files, a 32GB solid block size ensures the best results on 64-bit systems.

: It achieves a much smaller total file size than standard compression because it can reference identical data across different files. Solid compression is most effective when you are

: Increasing the number of threads to match your CPU's logical processors can speed up the compression process, though it may slightly increase the final archive size.