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https://issues.apache.org/jira/browse/TEXT-99?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16129572#comment-16129572
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Tom Howard commented on TEXT-99:
--------------------------------
FYI StringEscapeUtils.ESCAPE_JSON.translate(CharSequence, writer) appears to be
slower because it calls `java.io.write(int c)`, which results in a large number
of memory allocations before, which causes excessive GC load. Better to call
`java.io.write(char cbuf[], int off, int len)` instead.
> Performance Degradation for Escaping JSON
> -----------------------------------------
>
> Key: TEXT-99
> URL: https://issues.apache.org/jira/browse/TEXT-99
> Project: Commons Text
> Issue Type: Bug
> Affects Versions: 1.1
> Environment: OS X 10.11.6
> java version "1.8.0_60"
> Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
> Java HotSpot(TM) 64-Bit Server VM (build 25.60-b23, mixed mode)
> JProfiler 9.1 (Build 9128)
> Reporter: Tom Howard
> Priority: Minor
> Labels: escape, json, performance
>
> There seams to be a small performance degradation on
> StringEscapeUtils.escapeJson(String) in commons-text v1.1 compared to
> commons-lang3 v3.5
> I have a performance test that involves (amongst other things) escaping
> 200,052 strings. Using commons-text v1.1 this consistently takes 100ms to
> 110ms. Using commons-lang3 v3.5 this consistently takes 92ms to 95ms.
> Also, after escaping I'm writing it to using java.io.Writer.write(String). I
> would have assumed that StringEscapeUtils.ESCAPE_JSON.translate(CharSequence,
> writer) would yield better performance, however in the same test, using this
> method constantly takes approx 210ms and the parent method (which serialises
> the entire payload to JSON) takes approx 1750ms compared to approx 1400ms
> using StringEscapeUtils.escapeJson(String) from commons-lang3 v3.5
> I've marked the issue as minor, as it doesn't really impact me, but I thought
> I should share my findings.
> The serialiser can be found at
> https://github.com/mountain-pass/ryvr/blob/master/src/main/java/au/com/mountainpass/ryvr/io/RyvrSerialiser.java
> and the performance test can be executed using `./gradlew
> testRyvrTests_Integration_Performance_Java_H2Local`
> Also, I should mention that StringEscapeUtils.escapeJson is an order of
> magnitude faster than the equivalents from:
> - org.json:json:20170516
> - org.unbescape:unbescape:1.1.5.RELEASE
> - com.googlecode.json-simple:1.1.1
> - net.minidev:son-smart:2.3
> They literally take over 1000ms to do what StringEscapeUtils.escapeJson()
> does in about 100ms. If there are any other libs you would like me to test
> against for comparison purposes, please let me know.
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