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This mode is most effective when your archive contains many files of the same type or with similar content, as it "consolidates" the redundancy. Important Trade-offs

Updating or adding a new file to an existing solid archive can be slower because the software may need to recompress a portion or all of the solid block. A67zip

To extract a single file from the middle of a solid block, 7-Zip must decode all the data preceding it in that block, which can make extracting individual files slower. This mode is most effective when your archive

Because 7-Zip can find patterns across different files rather than just within a single one, solid archives are usually much smaller than non-solid ones. A67zip