Vega Studio Performance CLI

Performance CLI is installed as part of the Vega Developer Tools (VDT). To analyze app performance, you can use either the command palette in the Vega Studio extension or the Performance command-line interface (CLI).

Prerequisites

1. Install the Vega SDK.

2. Verify if the Performance CLI is installed in your development environment:

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   vega exec perf --help
   

Help option

To explore options for all Performance CLI commands:

vega exec perf --help

To get information about a specific command:

vega exec perf [command] --help

To see all options for the record command:

vega exec perf record --help

Commonly used commands

vega exec perf record

Use the record command to start the Event Recording tool. This captures performance events for analysis. The command takes the following arguments:

• --app-name - Specifies the app's main interactive component name from manifest.toml
• --recording-timeout - Sets the recording duration in seconds (default: 120s)
• --device-serial-number - Sets the device serial number when you have multiple devices
• --output-dir - Specifies the output directory path
• --trace-categories - Specifies platform trace categories to enable during tracing. Default categories: app, graphics, ui, lifecycle, input, video, and webview
• --enable-cpu-sched - Enables CPU scheduler event recording during tracing (disabled by default)

To record performance events for your app:

vega exec perf record --app-name com.<COMPANY NAME>.<APPNAME>.main

To record with a specific timeout:

vega exec perf record --app-name com.<COMPANY NAME>.<APPNAME>.main --recording-timeout 60

To record with custom trace categories:

vega exec perf record --app-name com.<COMPANY NAME>.<APPNAME>.main --trace-categories app,graphics,ui,video

To record with CPU scheduler events enabled:

vega exec perf record --app-name com.<COMPANY NAME>.<APPNAME>.main --enable-cpu-sched

vega exec perf activity-monitor

Use the activity-monitor command to start the Activity Monitor tool. The command takes the following arguments:

• --app-name - Specifies the app's main interactive component name from manifest.toml
• --record-cpu-profiling - Enables the JavaScript CPU Profiler during recording
• --sourcemap-file-path - Specifies the JavaScript source map path (required when using --record-cpu-profiling)

To monitor app activity:

vega exec perf activity-monitor --app-name com.<COMPANY NAME>.<APPNAME>.main

To monitor with CPU profiling enabled:

vega exec perf activity-monitor --app-name com.<COMPANY NAME>.<APPNAME>.main --record-cpu-profiling --sourcemap-file-path /path/to/sourcemap

vega exec perf memory-monitor

Use the memory-monitor command to start the Memory Monitor tool. The command takes the following arguments:

• --app-name - Specifies the app's main interactive component name from manifest.toml
• --keplerscript-app - Specifies the app is a React Native-based app for Vega
• --relative-gc-count - Shows Garbage Collection (GC) count as delta between current and previous GC count (available only with React Native-based apps)

To monitor app memory:

vega exec perf memory-monitor --app-name com.<COMPANY NAME>.<APPNAME>.main

To monitor with relative garbage collection count for React Native apps:

vega exec perf memory-monitor --app-name com.<COMPANY NAME>.<APPNAME>.main --keplerscript-app --relative-gc-count

To start and stop recording sessions:

For Mac:

1. Press s to start recording.
2. Press s again to stop the recording.

If pressing s doesn't work, press S and Return.

For Linux:

1. Press s to start recording.
2. Press s again to stop the recording.

If pressing s doesn't work, press S and Enter.

Press q and Return, or q and Enter, to quit recording.

vega exec perf kpi-visualizer

Use the kpi-visualizer command to measure your app KPIs. The command takes the following arguments:

• --app-name - Specifies the app's main interactive component name from manifest.toml
• --overridden-video-fps - Overrides the frames per second for video fluidity calculations during video playback

To measure app KPIs:

vega exec perf kpi-visualizer --app-name com.<COMPANY NAME>.<APPNAME>.main

To override video FPS for video fluidity calculations:

vega exec perf kpi-visualizer --app-name com.<COMPANY NAME>.<APPNAME>.main --overridden-video-fps 30

Related topics

• 💬 Community: Inspect JS traces from Vega Apps
• 💬 Community: Using React DevTools to profile component rendering
• Vega SDK CLI Reference
• Vega Studio Commands

Last updated: Dec 10, 2025