iOS+ Android Web
This page provides troubleshooting tips for getting started with Performance Monitoring or using Performance Monitoring features and tooling. ## **First checks for troubleshooting** The following two checks are general best practices recommended for anyone before further troubleshooting. #### 1. Check log messages for performance events Check your log messages to be sure that the Performance Monitoring SDK is capturing performance events.
How to view log messages for performance events
1. Enable debug logging, as follows: 1. In Xcode (minimum v26.2), select **Product** \> **Scheme** \> **Edit scheme**. 2. Select **Run** from the left menu, then select the **Arguments** tab. 3. In the *Arguments Passed on Launch* section, add `-FIRDebugEnabled`. 2. Check your log messages for any error messages. 3. Performance Monitoring tags its log messages with `Firebase/Performance` so that you can filter your log messages. 4. Check for the following types of logs which indicate that Performance Monitoring is logging performance events: - `Logging trace metric: TRACE_NAME, FIREBASE_PERFORMANCE_CONSOLE_URL` - `Logging network request trace: URL` 5. Click on the URL to view your data in the Firebase console. It may take a few moments for the data to update in the dashboard. If your app isn't logging performance events, review the [troubleshooting tips](https://firebase.google.com/docs/perf-mon/troubleshooting?platform=ios#app-not-logging-events).

#### 2. Check the Firebase Status Dashboard Check the [Firebase Status Dashboard](https://status.firebase.google.com/) in case there is a known outage for Firebase or for Performance Monitoring. ## **Getting started with Performance Monitoring** If you're getting started with Performance Monitoring ([iOS+](https://firebase.google.com/docs/perf-mon/get-started-ios.md.txt) \| [Android](https://firebase.google.com/docs/perf-mon/get-started-android.md.txt) \| [Web](https://firebase.google.com/docs/perf-mon/get-started-web.md.txt)), the following troubleshooting tips can help with issues that involve Firebase detecting the SDK or displaying your first performance data in the Firebase console.
### Added the SDK to app, but console still says to add SDK
Firebase can detect if you've successfully added the Performance Monitoring SDK to your app when it receives event information (like app interactions) from your app. Usually within 10 minutes of starting your app, the [*Performance* dashboard](https://console.firebase.google.com/project/_/performance) of the Firebase console displays an "SDK detected" message. Then, within 30 minutes, the dashboard displays the initial processed data. If it's been more than 10 minutes since you added the latest version of SDK to your app, and you're still not seeing any change, [check your log messages](https://firebase.google.com/docs/perf-mon/troubleshooting#check-logs-for-events) to make sure that Performance Monitoring is logging events. Try the appropriate troubleshooting steps as described below to troubleshoot a delayed SDK detection message.
**App is logging events: troubleshooting steps**
> [!NOTE] > **Note:** The Performance Monitoring SDK batches events locally then sends them to Firebase periodically or when the app comes back to foreground. So, there's a delay between an app interaction and when Firebase receives the event information from your app. 1. If you're still developing locally, try generating more events for data collection: 1. Continue to develop your app using a simulator or test device. 2. Generate events by switching your app between background and foreground several times, interacting with your app by navigating across screens, and/or triggering network requests. 2. Make sure that your [Firebase configuration file](https://firebase.google.com/docs/ios/setup#add-config-file) (`Google-Service-Info.plist`) is correctly added to your app and that you haven't modified the file. Specifically, check the following: - The config file name isn't appended with additional characters, like `(2)`. - The config file is in the root of your XCode project and added to the correct targets. - The Firebase Apple App ID (`GOOGLE_APP_ID`) listed in the config file is correct for your app. Find your Firebase App ID in the *Your apps* card of your [**Project settings**](https://console.firebase.google.com/project/_/settings/general/). If anything seems wrong with the config file in your app, try the following: 1. Delete the config file that you currently have in your app. 2. Follow [these instructions](https://firebase.google.com/docs/ios/setup.md.txt#add-config-file) to download a new config file and add it to your Apple app. 3. If the SDK is logging events and everything seems to be set up correctly, but you're still not seeing the SDK detection message or processed data (after 2 hours), [contact Firebase Support](https://firebase.google.com/docs/perf-mon/troubleshooting.md.txt#contact-support).


**App is *not* logging events: troubleshooting steps**
1. Make sure that the [Performance Monitoring SDK is ***not*** disabled](https://firebase.google.com/docs/perf-mon/disable-sdk?platform=ios#disable-during-build) through either of the following flags in your `Info.plist` file: - `firebase_performance_collection_enabled` - `firebase_performance_collection_deactivated` 2. Make sure that Performance Monitoring is ***not*** disabled at runtime ([Swift](https://firebase.google.com/docs/reference/swift/firebaseperformance/api/reference/Classes/Performance.md.txt#isdatacollectionenabled) \| [Obj-C](https://firebase.google.com/docs/reference/ios/firebaseperformance/api/reference/Classes/FIRPerformance.md.txt#datacollectionenabled)). 3. If you can't find anything that's disabled in your app, [contact Firebase Support](https://firebase.google.com/docs/perf-mon/troubleshooting.md.txt#contact-support).




### Console says the SDK is detected, but no data is displayed
Performance Monitoring processes performance event data before displaying it in the [*Performance* dashboard](https://console.firebase.google.com/project/_/performance). If it's been **more than 24 hours since the "SDK detected" message appeared** , and you're still not seeing data, then check the [Firebase Status Dashboard](https://status.firebase.google.com/) in case there is a known outage. If there is no outage, [contact Firebase Support](https://firebase.google.com/docs/perf-mon/troubleshooting.md.txt#contact-support).

## **General troubleshooting** If you've successfully added the SDK and are using Performance Monitoring in your app, the following troubleshooting tips can help with general issues that involve Performance Monitoring features and tooling.
### App is not logging performance events
If you're not seeing [log messages for performance events](https://firebase.google.com/docs/perf-mon/troubleshooting#check-logs-for-events), try the following troubleshooting steps: 1. Make sure that the [Performance Monitoring SDK is ***not*** disabled](https://firebase.google.com/docs/perf-mon/disable-sdk?platform=ios#disable-during-build) through either of the following flags in your `Info.plist` file: - `firebase_performance_collection_enabled` - `firebase_performance_collection_deactivated` 2. Make sure that Performance Monitoring is ***not*** disabled at runtime ([Swift](https://firebase.google.com/docs/reference/swift/firebaseperformance/api/reference/Classes/Performance.md.txt#isdatacollectionenabled) \| [Obj-C](https://firebase.google.com/docs/reference/ios/firebaseperformance/api/reference/Classes/FIRPerformance.md.txt#datacollectionenabled)). 3. If you can't find anything that's disabled in your app, [contact Firebase Support](https://firebase.google.com/docs/perf-mon/troubleshooting.md.txt#contact-support).


### Performance dashboard is missing screen trace data
If you're missing data for screen rendering traces, try the following troubleshooting steps:


### Performance dashboard is missing custom trace data
Are you seeing performance data for automatically collected traces *but not for custom code traces*? Try the following troubleshooting steps: 1. Check the setup of custom code traces instrumented via the [Trace API](https://firebase.google.com/docs/perf-mon/custom-code-traces.md.txt?platform=ios#add-custom-traces), especially the following: - Names for custom code traces and custom metrics must meet the following requirements: no leading or trailing whitespace, no leading underscore (`_`) character, and max length is 32 characters. - All traces must be started and stopped. Any trace that is not started, not stopped, or stopped before started will not be logged.
2. [Check your log messages](https://firebase.google.com/docs/perf-mon/troubleshooting.md.txt#check-logs-for-events) to make sure that Performance Monitoring is logging expected custom code traces. 3. If Performance Monitoring is logging events, but no data displays after 24 hours, [contact Firebase Support](https://firebase.google.com/docs/perf-mon/troubleshooting.md.txt#contact-support).


### Performance dashboard is missing network request data
If you're missing network request data, try the following troubleshooting steps: 1. Check for network library incompatibility. Performance Monitoring [automatically collects metrics for network requests](https://firebase.google.com/docs/perf-mon/network-traces?platform=ios) that use the following networking libraries: - For Swift: URLSession and URLConnection - For Objective-C: NSURLSession and NSURLConnection Note that you can [add custom monitoring for network requests](https://firebase.google.com/docs/perf-mon/custom-network-traces?platform=ios). 2. Be aware of the following: - Depending on the behavior of your code and networking libraries used by your code, Performance Monitoring might only report on network requests that are completed. This means that HTTP/S connections that are left open might not be reported. - Performance Monitoring does not report on network requests with invalid `Content-Type` headers. However, network requests without the `Content-Type` headers will still be accepted.


### Network request data are not aggregating as expected
Learn more about [how Performance Monitoring aggregates network request data](https://firebase.google.com/docs/perf-mon/network-traces#url-patterns) under URL patterns. You can also try out [custom URL patterns](https://firebase.google.com/docs/perf-mon/custom-url-patterns)!

## **FAQ** iOS+ Android Web
#### What happened to Top Issues in the Performance card on Project home?
We replaced **Top Issues** with **Recent Alerts** as a follow-up to our recent introduction of alerts, which automatically notify you when the thresholds you set are crossed. [Issues are now deprecated](https://firebase.google.com/docs/perf-mon/troubleshooting.md.txt?platform=ios#faq-issues-tab) and replaced by alerts. The apps selector at the top of the Performance card filters the alert entries under **Recent Alerts**. Only the three most recent alerts for the app(s) selected are displayed. To learn more about alerts, see [Set up alerts for performance issues](https://firebase.google.com/docs/perf-mon/alerts.md.txt).


#### What happened to the ability to set thresholds for issues in the console?
Performance Monitoring supports [alerts](https://firebase.google.com/docs/perf-mon/alerts.md.txt) for metrics that exceed defined thresholds. To avoid confusion with these configurable thresholds for performance metrics, we removed the ability to configure thresholds for [issues](https://firebase.google.com/docs/perf-mon/issue-management).


#### What happened to the Details and Metrics information in the Firebase console?
We replaced the Details and Metrics pages with a newly redesigned, centralized user interface (UI) to improve how you troubleshoot issues. This new troubleshooting UI offers the same core functionality that Details and Metrics offered. To learn more about troubleshooting, see [View more data for a specific trace](https://firebase.google.com/docs/perf-mon/console.md.txt#view_more_data_for_a_specific_trace).


#### Why is the number of samples not what I expect?
Performance Monitoring collects performance data from your app's user devices. If your application has many users or if the app generates a large amount of performance activity, Performance Monitoring might limit data collection to a subset of devices to reduce the number of processed events. These limits are high enough so that, even with fewer events, the metric values are still representative of your user's app experience. To manage the volume of data that we collect, Performance Monitoring uses the following sampling options: - **On-device rate limiting**: To prevent a device from sending sudden bursts of traces, we limit the number of code and network request traces sent from a device to 300 events every 10 mins. This approach protects the device from looped instrumentations that can send large amounts of performance data, and it prevents a single device from skewing the performance measurements. - **Dynamic sampling** : Performance Monitoring collects a limited number of code traces and network request traces per app daily across all app users. A dynamic sampling rate is fetched on devices (using Firebase Remote Config) to determine whether a random device should capture and send traces. A device that is not selected for sampling does not send any events. The dynamic sampling rate is app-specific and adjusts to ensure that the overall volume of collected data remains below the limit. Projects that enabled BigQuery integration receive a higher limit for the number of network request traces. User sessions send additional, detailed data from a user's device, requiring more resources to capture and send the data. To minimize the impact of user sessions, Performance Monitoring might also restrict the number of sessions. - **Server-side rate limiting** : To ensure that apps don't exceed the sampling limit, Performance Monitoring might use server-side sampling to drop some events received from devices. Although this type of limiting doesn't change the effectiveness of our metrics, it may cause minor pattern shifts, including the following: - The number of traces can differ from the number of times that a piece of code was executed. - Traces that are closely coupled in code may each have a different number of samples. > [!NOTE] > **Note:** Specific sampling limits and their application might change as Performance Monitoring evolves.


#### What happened to the *Issues* tab in the console?
We replaced the Issues tab with the introduction of Alerts, which automatically notifies you when the thresholds you set are exceeded. You no longer need to manually check the Firebase console to determine the status of a threshold. To learn about Alerts, see [Set up alerts for performance issues](https://firebase.google.com/docs/perf-mon/alerts.md.txt).


#### What happened to the *On Device* and *Network* tabs in the console? How do I view the traces that were on those pages?
We've redesigned the Performance Monitoring section of the Firebase console so that the *Dashboard* tab displays your key metrics and all your traces in one space. As part of the redesign, we removed the *On device* and *Network* pages. The traces table at the bottom of the *Dashboard* tab has all the same information that the *On device* and *Network* tabs displayed, but with some added features, including the ability to sort your traces by the percentage change for a specific metric. To view *all* the metrics and data for a specific trace, click the trace name in the traces table. View your traces in the following subtabs of the traces table: - Network request traces (both out-of-the-box and custom) --- *Network requests* subtab - Custom code traces --- *Custom traces* subtab - App start, app-in-foreground, app-in-background traces --- *Custom traces* subtab - Screen rendering traces --- *Screen rendering* subtab - Page load traces --- *Page load* subtab For details about the traces table and viewing metrics and data, visit the console overview page ([iOS+](https://firebase.google.com/docs/perf-mon/console.md.txt?platform=ios#view-traces-and-data) \| [Android](https://firebase.google.com/docs/perf-mon/console.md.txt?platform=android#view-traces-and-data) \| [Web](https://firebase.google.com/docs/perf-mon/console.md.txt?platform=web#view-traces-and-data)).


#### Why is the number of slow and frozen frames not what I expected?
Slow rendering frames and frozen frames are calculated with an assumed device refresh rate of 60Hz. If a device refresh rate is lower than 60Hz, each frame will have a slower rendering time because fewer frames are rendered per second. Slower rendering times can cause more slow or frozen frames to be reported because more frames will be rendered slower or will freeze. However, if a device refresh rate is higher than 60Hz, each frame will have a faster rendering time. This can cause fewer slow or frozen frames to be reported. This is a current limitation in the Performance Monitoring SDK.


#### My Performance Monitoring data is taking longer than expected to be exported to BigQuery. Is it not real time?
If you have enabled the BigQuery integration for Firebase Performance Monitoring, your data will be exported to BigQuery 12 to 24 hours after the end of the day (Pacific Time). For example, the data for April 19th will be available in BigQuery on April 20th between 12:00pm and midnight (all dates and times are Pacific Time).


#### How many custom URL patterns can I create?
You can create up to 400 total custom URL patterns per app and up to 100 custom URL patterns per domain for that app.


### Near real-time data processing and display
#### What does "near real-time" performance data mean?
Firebase Performance Monitoring processes collected performance data as it comes in, which results in near real-time data display in the Firebase console. Processed data displays in the console within a few minutes of its collection, hence the term "near real-time". To take advantage of near real-time data processing, make sure your app uses a [real-time compatible SDK version](https://firebase.google.com/docs/perf-mon/troubleshooting#faq-real-time-compatible-sdk-versions).


#### How do I get near real-time performance data for my app?
To take advantage of near real-time data processing, you only need to make sure that your app uses a Performance Monitoring SDK version that's compatible with real-time data processing. These are the real-time compatible SDK versions: - **iOS** --- v7.3.0 or later - **tvOS** --- v8.9.0 or later - **Android** --- v19.0.10 or later (or Firebase Android BoM v26.1.0 or later) - **Web** --- v7.14.0 or later Note that we always recommend using the latest version of SDK, but any version listed above will enable Performance Monitoring to process your data in near real time.



#### Which versions of the Performance Monitoring SDK are considered real-time compatible?
These are the SDK versions compatible with real-time data processing: - **iOS** --- v7.3.0 or later - **tvOS** --- v8.9.0 or later - **Android** --- v19.0.10 or later (or Firebase Android BoM v26.1.0 or later) - **Web** --- v7.14.0 or later Note that we always recommend using the latest version of SDK, but any version listed above will enable Performance Monitoring to process your data in near real time.



#### What if I don't update my app to use a real-time compatible SDK version?
If your app doesn't use a real-time compatible SDK version, you will still see all your app's performance data in the Firebase console. However, the display of performance data will be delayed by roughly 36 hours from the time of its collection.


#### I've updated to a real-time compatible SDK version, but some of my users are still on old versions of my app. Do I continue to see their performance data in the Firebase console?
Yes! Regardless of which SDK version an app instance uses, you'll see performance data from all your users. However, if you're looking at *recent* data (less than roughly 36 hours old), then the displayed data is from users of app instances using a real-time compatible SDK version. The *non-recent* data, though, includes performance data from all versions of your app.


#### Why am I not seeing real time display of performance data?

To view real time performance data, make sure that your app uses a Performance Monitoring SDK version that's compatible with real time data processing. - **iOS** --- v7.3.0 or later - **tvOS** --- v8.9.0 or later - **Android** --- v19.0.10 or later (or Firebase Android BoM v26.1.0 or later) - **Web** --- v7.14.0 or later Note that we always recommend using the latest version of SDK, but any version listed above will enable Performance Monitoring to process your data in near real time.



## **Contacting Firebase Support** If you [reach out to Firebase Support](https://firebase.google.com/support/troubleshooter/contact), always include your Firebase App ID. Find your Firebase App ID in the *Your apps* card of your [**Project settings**](https://console.firebase.google.com/project/_/settings/general/).