#Analysis JavaScript

Trace supports recording detailed JavaScript profile data. A JavaScript Profile is a collection of stack traces sampled during execution, which is crucial for pinpointing performance hotspots and bottlenecks. This allows you to analyze script execution performance.

#Click JS Profile and Select the correct scripts engine

Based on the background thread scripts engine used by your Lynx page, choose the appropriate value in the JS Profile selection.

• disable: Do not enable JavaScript profiling;
• primjs: Enable profiling for the PrimJS JavaScript engine.
• v8: Enable profiling for the V8 JavaScript engine.

#Start recording

Click Start button to begin recording trace.

#Stop recording

When finished, click Stop button to end the recording.

#Decode JavaScript Profile Data using sourcemap (Optional)

If your scripts is minified, you can use sourcemap to decode profile data.

#FAQ

#No JavaScript profile data after recording trace

• Make sure you have selected the correct script engine before starting recording.
• On iOS, ensure both Lynx DevTool and PrimJS Debugging are enabled.

#No scripting resource found after clicking SourceMap Decode

• Ensure you start trace recording before opening the Lynx page so that the script resource name can be captured.