(diff.info.gz) Speedups

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(diff.info.gz) Ignoring Changes

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 Improving Performance
 ---------------------
 
    When comparing two large directory structures, one of which was
 originally copied from the other with time stamps preserved (e.g., with
 `cp -pR'), it would greatly improve performance if an option told
 `diff' to assume that two files with the same size and time stamps have
 the same content.   diff Performance.
 

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(diff.info.gz) Ignoring Changes

(diff.info.gz) Shortcomings