Benoit Tellier created MIME4J-306:
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             Summary: MimeUtil::unfold should group char appends
                 Key: MIME4J-306
                 URL: https://issues.apache.org/jira/browse/MIME4J-306
             Project: James Mime4j
          Issue Type: Improvement
          Components: core
    Affects Versions: 0.8.5
            Reporter: Benoit Tellier
             Fix For: 0.8.6


Calling repeatedly append requires ensuring the capacity amongst other.

Appends to the string builder can be done for all previous chars when a line 
delimiter is encountered, thus reducing the cost of the operation.

Gain: 66%

Attached are the flame graphs:

 - Before
 - After (Combined with MIME4J-304 and MIME4J-305)



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