They're big enough that it shouldn't help. Dictionaries are useful when you're compressing tiny files such that the overhead of the compressor learning the sta

They're big enough that it shouldn't help. Dictionaries are useful when you're compressing tiny files such that the overhead of the compressor learning the statistics from the input is significant. Basically you hope to save a fraction of the size of the dictionary from each file. From a 2GB file that's negligible. From a 1000 byte file it could be gigantic.