magibney commented on issue #892: LUCENE-8972: Add ICUTransformCharFilter, to support pre-tokenizer ICU text transformation URL: https://github.com/apache/lucene-solr/pull/892#issuecomment-537601926 Tried this out, and the performance gain was indeed significant. Comparing apples to apples here: [charFilterPerformanceTest2.txt](https://github.com/apache/lucene-solr/files/3682491/charFilterPerformanceTest2.txt) Results (again, very quick and dirty): ``` [junit4] Suite: org.apache.lucene.analysis.icu.TestICUTransformCharFilter [junit4] 2> tokenCount: 1000000, elapsed: 20244 [junit4] OK 20.6s | TestICUTransformCharFilter.testFilterPerformanceChar [junit4] 2> tokenCount: 1000000, elapsed: 3040 [junit4] OK 3.05s | TestICUTransformCharFilter.testFilterPerformanceToken [junit4] 2> tokenCount: 1000000, elapsed: 4339 [junit4] OK 4.36s | TestICUTransformCharFilter.testFilterPerformanceModifiedChar ```
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