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https://issues.apache.org/jira/browse/LUCENE-1497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12661992#action_12661992
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Michael McCandless commented on LUCENE-1497:
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In fact I think it may be faster to not even use StringBuffer in highlightTerm?
Since we know we are concatenating 3 strings can we just + them? I suspect
that'd give better net performance (pure speculation!).
> Minor changes to SimpleHTMLFormatter
> ------------------------------------
>
> Key: LUCENE-1497
> URL: https://issues.apache.org/jira/browse/LUCENE-1497
> Project: Lucene - Java
> Issue Type: Improvement
> Components: contrib/highlighter
> Reporter: Shai Erera
> Priority: Minor
> Fix For: 2.4.1, 2.9
>
> Attachments: LUCENE-1497.patch
>
>
> I'd like to make few minor changes to SimpleHTMLFormatter.
> 1. Define DEFAULT_PRE_TAG and DEFAULT_POST_TAG and use them in the default
> constructor. This will not trigger String lookups by the JVM whenever the
> highlighter is instantiated.
> 2. Create the StringBuffer in highlightTerm with the right number of
> characters from the beginning. Even though StringBuffer's default constructor
> allocates 16 chars, which will probably be enough for most highlighted terms
> (pre + post tags are 7 chars, which leaves 9 chars for terms), I think it's
> better to allocate SB with the right # of chars in advance, to avoid char[]
> allocations in the middle.
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