LZ4HC is a high compression variant of LZ4. LZ4HC compression results in larger compressed files than LZMA, but does not require the entire archive to be decompressed before use.
LZ4HC compression makes it possible to load individual assets from an archive quickly and using less memory than LZMA-compressed archives. This compression method is not available for recompressing AssetBundles at runtime, but LZ4 is.