Perf Lens
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How to Compare Performance Reports

  1. 1Run a performance test on the baseline version of your code and export the report as JSON
  2. 2Make your code optimizations and run another test, then export the comparison report
  3. 3Upload both JSON reports to see detailed comparisons with percentage changes
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Perfect for Comparing...

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Before & After Optimization

Measure the impact of your code optimizations with precise percentage improvements

⚖️

Different Implementations

Compare multiple approaches to solve the same problem and choose the fastest

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Algorithm Performance

Benchmark different algorithms side-by-side to identify the most efficient solution

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Library Comparisons

Compare performance between different JavaScript libraries or frameworks

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Version Upgrades

Validate performance improvements or regressions when upgrading dependencies

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Production Optimization

Quantify performance gains before deploying optimized code to production

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Comparison Features

  • ✓Side-by-side metric comparison
  • ✓Percentage change calculations
  • ✓Execution time differences
  • ✓Memory usage analysis
  • ✓Bundle size comparison
  • ✓Export comparison reports

Baseline Report

Upload the baseline test report (JSON format)

Upload a JSON test report

Maximum file size: 10 MB

Comparison Report

Upload the report you want to compare against baseline

Upload a JSON test report

Maximum file size: 10 MB

Upload both reports to see the comparison

Reports must be in JSON format, exported from Perf Lens

Compare JavaScript Performance Reports | Perf Lens