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

: 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. Elle.7z

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

: 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. Solid compression is most effective when you are

Are you looking to an existing Elle.7z file for size, or do you need help extracting specific data from one?

: Reducing the dictionary size can help if you are low on RAM, but it will generally result in a larger file. Best Use Cases

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