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https://issues.apache.org/jira/browse/LUCENE-871?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12521089
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Stanislaw Osinski commented on LUCENE-871:
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One possible (and probably large) speed up for this code would be replacing the
switch / case structure (which for most characters needs to be evaluated down
to the "default", which is _lots_ of comparisons) with a plain static
char[65536][] table. The cost for this is roughly 130kB of memory, but the
speed-up should be pretty good. If lots of people are using this filter and the
memory cost is acceptable, later this week I can try to prepare another patch.
> ISOLatin1AccentFilter a bit slow
> --------------------------------
>
> Key: LUCENE-871
> URL: https://issues.apache.org/jira/browse/LUCENE-871
> Project: Lucene - Java
> Issue Type: Bug
> Components: Analysis
> Affects Versions: 1.9, 2.0.0, 2.0.1, 2.1, 2.2
> Reporter: Ian Boston
> Assignee: Michael McCandless
> Fix For: 2.3
>
> Attachments: fasterisoremove1.patch, fasterisoremove2.patch,
> ISOLatin1AccentFilter.java.patch, LUCENE-871.take4.patch
>
>
> The ISOLatin1AccentFilter is a bit slow giving 300+ ms responses when used in
> a highligher for output responses.
> Patch to follow
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