# MetalFrameRateMetric A metric that measures Metal frame rate statistics for a specific `CAMetalLayer`. ``` struct MetalFrameRateMetric ``` ## Discussion This metric corresponds to the [`MetricResult.metalFrameRate(_:)`](/documentation/MetricKit/MetricResult/metalFrameRate(_:)) case. It appears only in [`intervalEntries`](/documentation/MetricKit/MetricReport/intervalEntries) and is not included in state entries. Each `MetalFrameRateMetric` corresponds to a single `CAMetalLayer`, identified by [`layerName`](/documentation/MetricKit/MetalFrameRateMetric/layerName). When your app has multiple Metal layers, the report may include multiple instances of this metric case, one for each layer. ## Topics ### Frame rate [`let framesPerSecond: Measurement`](/documentation/MetricKit/MetalFrameRateMetric/framesPerSecond) The frame rate associated with this `CAMetalLayer` [`let frameCount: Int`](/documentation/MetricKit/MetalFrameRateMetric/frameCount) The total Metal drawable count [`let activeDrawingDuration: Measurement`](/documentation/MetricKit/MetalFrameRateMetric/activeDrawingDuration) The duration of time spent actively producing new frames ### Layer [`let layerName: String`](/documentation/MetricKit/MetalFrameRateMetric/layerName) The `CAMetalLayer` name this metric corresponds to ## Relationships ### Conforms To [`Encodable`](/documentation/Swift/Encodable) [`Hashable`](/documentation/Swift/Hashable) [`Sendable`](/documentation/Swift/Sendable) [`Equatable`](/documentation/Swift/Equatable) [`SendableMetatype`](/documentation/Swift/SendableMetatype) [`Decodable`](/documentation/Swift/Decodable) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)