> So for a compression ratio that is still relatively close to gzip, it's
 > much faster to extract, at least in that case.

Is that "time to run the extraction algorithm", or "time to read in image from media and extract"? I think the time to read from the media would tend to dominate the decompression time. Either way, could you provide the other time for each algorithm in order to give a sense of how this might scale to other CPU speeds/media read speeds?

If you have very slow media, you probably want to use LZMA. If you have a very slow CPU and comparatively fast media, LZO might be a good option... I have heard people asking for *uncompressed* kernels for this reason, but LZO runs at a significant fraction of memcpy() speed.

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