Add Performance Issues to Perf Monitor (1/2) #54265
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Summary:
Introduces the concept of **Performance Issues**, an experimental performance signals concept for React Native.
**Design**
Performance Issues are an **experimental** user space API via the User Timings `detail` object.
```
performance.measure({
start,
end,
detail: {
devtools: {
...
},
rnPerfIssue: {
name: 'React: Cascading Update',
severity: 'warning', // 'info' | 'warning' | 'error',
description:
'A cascading update is a update that is triggered by a previous update. This can lead to performance issues and should be avoided.',
learnMoreUrl:
'https://react.dev/reference/dev-tools/react-performance-tracks#cascading-updates',
}
}
});
```
When `rnPerfIssue` is present, we eagerly report an the event over CDP, regardless of an active performance trace, via the `"__react_native_perf_issues_reporter"` runtime binding.
**This diff**
- Adds a `perfIssuesEnabled` feature flag.
- Initial implementation of the above API.
- Initially reports a "Cascading Render" issue, aligning 1:1 with the corresponding React performance track event (note: to be added in the React codebase, see facebook/react#34961).
This feature is gated by the `perfMonitorV2Enabled` feature flag.
Changelog: [Internal]
Differential Revision: D85448200
huntie
added a commit
to huntie/react-native
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Oct 28, 2025
…ate payload structure for Performance Issues (facebook#54265) Summary: Pull Request resolved: facebook#54265 Introduces the concept of **Performance Issues**, an experimental performance signals concept for React Native. **Design** Performance Issues are an **experimental** user space API via the User Timings `detail` object. ``` performance.measure({ start, end, detail: { devtools: { ... }, rnPerfIssue: { name: 'React: Cascading Update', severity: 'warning', // 'info' | 'warning' | 'error', description: 'A cascading update is a update that is triggered by a previous update. This can lead to performance issues and should be avoided.', learnMoreUrl: 'https://react.dev/reference/dev-tools/react-performance-tracks#cascading-updates', } } }); ``` When `rnPerfIssue` is present, we eagerly report an the event over CDP, regardless of an active performance trace, via the `"__react_native_perf_issues_reporter"` runtime binding. **This diff** - Adds a `perfIssuesEnabled` feature flag. - Initial implementation of the above API. - Initially reports a "Cascading Render" issue, aligning 1:1 with the corresponding React performance track event (note: to be added in the React codebase, see facebook/react#34961). This feature is gated by the `perfMonitorV2Enabled` feature flag. Changelog: [Internal] Differential Revision: D85448200
huntie
added a commit
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Oct 30, 2025
Summary:
Introduces the concept of **Performance Issues**, an experimental performance signals concept for React Native.
**Design**
Performance Issues are an **experimental** user space API via the User Timings `detail` object.
```
performance.measure({
start,
end,
detail: {
devtools: {
...
},
rnPerfIssue: {
name: 'React: Cascading Update',
severity: 'warning', // 'info' | 'warning' | 'error',
description:
'A cascading update is a update that is triggered by a previous update. This can lead to performance issues and should be avoided.',
learnMoreUrl:
'https://react.dev/reference/dev-tools/react-performance-tracks#cascading-updates',
}
}
});
```
When `rnPerfIssue` is present, we eagerly report an the event over CDP, regardless of an active performance trace, via the `"__react_native_perf_issues_reporter"` runtime binding.
**This diff**
- Adds a `perfIssuesEnabled` feature flag.
- Initial implementation of the above API.
- Initially reports a "Cascading Render" issue, aligning 1:1 with the corresponding React performance track event (note: to be added in the React codebase, see facebook/react#34961).
This feature is gated by the `perfMonitorV2Enabled` feature flag.
Changelog: [Internal]
Differential Revision: D85448200
huntie
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export-D85448200
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Summary:
Introduces the concept of **Performance Issues**, an experimental performance signals concept for React Native.
**Design**
Performance Issues are an **experimental** user space API via the User Timings `detail` object.
```
performance.measure({
start,
end,
detail: {
devtools: {
...
},
rnPerfIssue: {
name: 'React: Cascading Update',
severity: 'warning', // 'info' | 'warning' | 'error',
description:
'A cascading update is a update that is triggered by a previous update. This can lead to performance issues and should be avoided.',
learnMoreUrl:
'https://react.dev/reference/dev-tools/react-performance-tracks#cascading-updates',
}
}
});
```
When `rnPerfIssue` is present, we eagerly report an the event over CDP, regardless of an active performance trace, via the `"__react_native_perf_issues_reporter"` runtime binding.
**This diff**
- Adds a `perfIssuesEnabled` feature flag.
- Initial implementation of the above API.
- Initially reports a "Cascading Render" issue, aligning 1:1 with the corresponding React performance track event (note: to be added in the React codebase, see facebook/react#34961).
This feature is gated by the `perfMonitorV2Enabled` feature flag.
Changelog: [Internal]
Differential Revision: D85448200
huntie
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the
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huntie
pushed a commit
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Oct 31, 2025
…ate payload structure for Performance Issues (facebook#54265) Summary: Pull Request resolved: facebook#54265 Introduces the concept of **Performance Issues**, an experimental performance signals concept for React Native. **Design** Performance Issues are an **experimental** user space API via the User Timings `detail` object. ``` performance.measure({ start, end, detail: { devtools: { ... }, rnPerfIssue: { name: 'React: Cascading Update', severity: 'warning', // 'info' | 'warning' | 'error', description: 'A cascading update is a update that is triggered by a previous update. This can lead to performance issues and should be avoided.', learnMoreUrl: 'https://react.dev/reference/dev-tools/react-performance-tracks#cascading-updates', } } }); ``` When `rnPerfIssue` is present, we eagerly report an the event over CDP, regardless of an active performance trace, via the `"__react_native_perf_issues_reporter"` runtime binding. **This diff** - Adds a `perfIssuesEnabled` feature flag. - Initial implementation of the above API. - Initially reports a "Cascading Render" issue, aligning 1:1 with the corresponding React performance track event (note: to be added in the React codebase, see facebook/react#34961). This feature is gated by the `perfMonitorV2Enabled` feature flag. Changelog: [Internal] Differential Revision: D85448200
|
This pull request has been merged in ee9ef3b. |
|
This pull request was successfully merged by @huntie in ee9ef3b When will my fix make it into a release? | How to file a pick request? |
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Summary:
Introduces the concept of Performance Issues, an experimental performance signals concept for React Native.
Design
Performance Issues are an experimental user space API via the User Timings
detailobject.When
rnPerfIssueis present, we eagerly report an the event over CDP, regardless of an active performance trace, via the"__react_native_perf_issues_reporter"runtime binding.This diff
perfIssuesEnabledfeature flag.This feature is gated by the
perfMonitorV2Enabledfeature flag.Changelog: [Internal]
Differential Revision: D85448200