What are the disadvantages of using ultra compression?

What are the disadvantages of using ultra compression?

ultra compression

7zip offers an option for ultra compression but I'm guessing that it has some disadvantages (other than being more time consuming) or else it would have been the default option... So what are they?

答案1

slower and more memory used. Many people are like I saved 1-5% and waited 5x longer, nope goodbye. This is not always the case, but some data doesn't compress more 1-5% better than normal.

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