johann-beessip opened a new pull request #651: Performance improvement for update?optimize=true URL: https://github.com/apache/lucene-solr/pull/651 For our use case we have a small number of documents with a large number of docValues. During optimize we noticed a lot of time being spent in the FilterFieldInfor constructor, on the filterFields.contains(...) function. The small change from an ArrayList to a LinkedHashSet reduced our optimize time from 60min to < 1min. This was added to branch 7_2 as that's the version we're still using, but the issue is still present in master: https://github.com/apache/lucene-solr/blob/master/lucene/core/src/java/org/apache/lucene/codecs/perfield/PerFieldDocValuesFormat.java#L142
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