[JENKINS-15818] Display exceedingly slow for large test results

When there are a lot of test cases in a single suite, rendering the summary page is dreadfully slow. Most of the time is taken in TestObject.uniquifyName, which can be called thousands of times, each taking several msec.

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Originally reported by jglick, imported from: Display exceedingly slow for large test results

• status: Open
  
• priority: Major
  
• component(s): junit-plugin
  
• label(s): performance
  
• resolution: Unresolved
  
• votes: 6
  
• watchers: 9
  
• imported: 2025-11-26
  

When there are a lot of test cases in a single suite, rendering the summary page is dreadfully slow. Most of the time is taken in TestObject.uniquifyName, which can be called thousands of times, each taking several msec.

2 attachments

- [AppTest.java](https://issues.jenkins.io/secure/attachment/32488/AppTest.java)
- [AppTest.java](https://issues.jenkins.io/secure/attachment/22823/AppTest.java)

Start by locating TestObject.uniquifyName and the summary-page rendering path in the junit-plugin. Reproduce the slowdown with a suite containing many test cases, then verify that rendering no longer spends excessive time in uniquifyName and completes substantially faster.

Written by the indexing model from the issue text.