# CAMetalLayer Performance Review CAMetalLayer metadata and performance in your app. ## Overview The data in this report contains metadata and performance information about how your app uses CAMetalLayer. - Territories: Worldwide - Platforms: iOS, iPadOS. For more information about iOS and iPadOS, see the Platforms section in [Data Completeness and Corrections](/documentation/Analytics-Reports/data-completeness-corrections). - Availability: - Daily: Every day. - History: On request, data is available beginning with iOS 17.4 and iPadOS 17.4. - Completeness: Data from devices that contribute to this report can arrive as late as 8 days after the date it generates on device. You can download recent data daily, but it might be incomplete, and data updates incrementally daily, until all late-arriving events are available. - Privacy: - Includes data from users who have opted to share their data with Apple and developers. - Individual rows will only appear if they have a value of 5 or more. - Data Context: You can analyze your data with additional context by comparing it with the data in the [App Sessions Context](/documentation/Analytics-Reports/app-sessions-context) report, which provides a count of unique devices that use your app on a specific day. For example, if your app performed an action detailed in this report on 10 unique devices on a specific day, and the App Sessions Context report shows there were 100 unique devices running your app that day, then you can approximate that 10% of the devices running your app performed that action. ## Report Fields |Report Field |Description |Data Type| |---------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------| |Count |Number of times the event occurred |`integer`| |Territory |Country or region in which the event occurred |`string` | |Date |Date when the event occurred |`string` | |Platform |OS version on the device on which the event occurred |`string` | |Device |Type of device on which the event occurred |`string` | |Build |Build of device on which event occurred |`string` | |Unique Devices |The count of unique devices |`integer`| |Release Type |Type of software release |`string` | |Bundle Short Version |The short bundle version of the client process. |`string` | |App Version |Version of the app associated with the event |`string` | |Layer Name |The name of the layer (if known). |`string` | |Process Name |The name of the CAMetalLayer client process. |`string` | |Active Duration |The amount of time, in seconds, that the most active layer in the CAMetalLayer client session actively generates new on-screen content. |`float` | |Average Height |The average height, in pixels, of the chosen CAMetalLayer over the course of the session. |`float` | |Average Width |The average width, in pixels, of the chosen CAMetalLayer over the course of the session. |`float` | |Client Lifetime Duration |The number of seconds the client process existed (estimated). |`float` | |Lifetime Active Layer Count |The total number of layers observed during the client’s lifetime. |`integer`| |Presented Frame Command Buffer Count |The number of command buffers associated with presented frames of the chosen CAMetalLayer. |`integer`| |Presented Frame Count |The number of presented frames, as determined by counting presented CAMetalDrawables of the chosen CAMetalLayer. |`integer`| |Skipped Frame Count |The number of skipped frames, for example, CAMetalDrawables created but not put on glass. |`integer`| |Total Presented Drawables Count |The total presented CAMetalDrawables across all CAMetalLayers of the client process, not just the most active CAMetalLayer. This approximates the proportion of the CAMetalDrawables reported.|`integer`| |On Glass Present Lateness Count |The count of frames that arrived late on glass. |`integer`| |Presented CPU End-To-End Drawable Total|The total end-to-end CPU walltime, in milliseconds, for all CAMetalDrawables for the chosen layer during the client’s lifetime. |`float` | |Presented On GPU Walltime Total |The total on-GPU walltime, in milliseconds, attributed to CAMetalDrawables for the chosen layer during the client’s lifetime. |`float` | |On Glass Present Lateness Total |The total estimated on-glass presentation lateness, in milliseconds, for drawables for the chosen layer during the lifetime of the client process. |`float` | |Presented GPU End-To-End Drawable Total|The total end-to-end GPU walltime, in milliseconds, for all CAMetalDrawables for the chosen layer during the client’s lifetime. |`float` | |Presented GPU Done-To-Completed Total |The total amount of time, in milliseconds, spent waiting for drawables to land on glass after GPU work completion from the selected CAMetalLayer. |`float` | |On Glass Interval Total |The total on-glass interval, in milliseconds, for CAMetalDrawables from the selected CAMetalLayer. |`float` | |On Glass Interval Count |The total number of on-glass frame (CAMetalDrawables) intervals for the given CAMetalLayer. |`integer`| ## Glossary |Dimension |Value |Definition | |--------------------|-------------------------------|--------------------------------| |Bundle Short Version|ExampleBundleShortVersion.0.1.2|Placeholder short version | |App Version |Example.BundleVersion.0.1.2 |Placeholder bundle version | |Layer Name |ExampleLayerName |Placeholder example layer name | |Process Name |ExampleProcessName |Placeholder example process name| --- Copyright © 2026 Apple Inc. 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