1e41f4b71Sopenharmony_ci# @ohos.arkui.performanceMonitor (Performance Monitor) (System API) 2e41f4b71Sopenharmony_ci 3e41f4b71Sopenharmony_ciThe **performanceMonitor** module provides APIs for performance monitoring indicators: response delay, completion delay, and frame loss rate. 4e41f4b71Sopenharmony_ci 5e41f4b71Sopenharmony_ci> **NOTE** 6e41f4b71Sopenharmony_ci> 7e41f4b71Sopenharmony_ci> The APIs of this module are supported since API version 10. Updates will be marked with a superscript to indicate their earliest API version. 8e41f4b71Sopenharmony_ci> 9e41f4b71Sopenharmony_ci> The APIs provided by this module are system APIs. 10e41f4b71Sopenharmony_ci 11e41f4b71Sopenharmony_ci 12e41f4b71Sopenharmony_ci## Modules to Import 13e41f4b71Sopenharmony_ci 14e41f4b71Sopenharmony_ci```ts 15e41f4b71Sopenharmony_ciimport { performanceMonitor } from '@kit.ArkUI'; 16e41f4b71Sopenharmony_ci``` 17e41f4b71Sopenharmony_ci 18e41f4b71Sopenharmony_ci 19e41f4b71Sopenharmony_ci## ActionType 20e41f4b71Sopenharmony_ci 21e41f4b71Sopenharmony_ciEnumerates types of actions that trigger user scenes. 22e41f4b71Sopenharmony_ci 23e41f4b71Sopenharmony_ci**System capability**: SystemCapability.ArkUI.ArkUI.Full 24e41f4b71Sopenharmony_ci 25e41f4b71Sopenharmony_ci| Name | Value | Description | 26e41f4b71Sopenharmony_ci| -- | -- | -- | 27e41f4b71Sopenharmony_ci| LAST_DOWN | 0 | Pressing against the screen. | 28e41f4b71Sopenharmony_ci| LAST_UP | 1 | Lifting a finger off the screen. | 29e41f4b71Sopenharmony_ci| FIRST_MOVE | 2 | First swiping on the screen. | 30e41f4b71Sopenharmony_ci 31e41f4b71Sopenharmony_ci 32e41f4b71Sopenharmony_ci## performanceMonitor.begin 33e41f4b71Sopenharmony_ci 34e41f4b71Sopenharmony_cibegin(scene: string, startInputType: ActionType, note?: string): void 35e41f4b71Sopenharmony_ci 36e41f4b71Sopenharmony_ciStarts a user scene. 37e41f4b71Sopenharmony_ci 38e41f4b71Sopenharmony_ci 39e41f4b71Sopenharmony_ci**System capability**: SystemCapability.ArkUI.ArkUI.Full 40e41f4b71Sopenharmony_ci 41e41f4b71Sopenharmony_ci**Parameters** 42e41f4b71Sopenharmony_ci 43e41f4b71Sopenharmony_ci| Name | Type | Mandatory | Description | 44e41f4b71Sopenharmony_ci| -- | -- | -- | -- | 45e41f4b71Sopenharmony_ci| scene | string | Yes | User scene ID. | 46e41f4b71Sopenharmony_ci| startInputType | [ActionType](#actiontype)| Yes | Type of action that triggers the user scene. | 47e41f4b71Sopenharmony_ci| note | string| No | Important information about the user scene. | 48e41f4b71Sopenharmony_ci 49e41f4b71Sopenharmony_ci**Example** 50e41f4b71Sopenharmony_ci ```ts 51e41f4b71Sopenharmony_ciperformanceMonitor.begin("LAUNCHER_APP_LAUNCH_FROM_ICON", performanceMonitor.ActionType.LAST_UP, "APP_START_BEGIN"); 52e41f4b71Sopenharmony_ci ``` 53e41f4b71Sopenharmony_ci 54e41f4b71Sopenharmony_ci 55e41f4b71Sopenharmony_ci## performanceMonitor.end 56e41f4b71Sopenharmony_ci 57e41f4b71Sopenharmony_ciend(scene: string): void 58e41f4b71Sopenharmony_ci 59e41f4b71Sopenharmony_ciEnds a user scene. 60e41f4b71Sopenharmony_ci 61e41f4b71Sopenharmony_ci**System capability**: SystemCapability.ArkUI.ArkUI.Full 62e41f4b71Sopenharmony_ci 63e41f4b71Sopenharmony_ci**Parameters** 64e41f4b71Sopenharmony_ci| Name | Type | Mandatory | Description | 65e41f4b71Sopenharmony_ci| -- | -- | -- | -- | 66e41f4b71Sopenharmony_ci| scene | string | Yes | User scene ID, which corresponds to that in **begin**. | 67e41f4b71Sopenharmony_ci 68e41f4b71Sopenharmony_ci**Example** 69e41f4b71Sopenharmony_ci ```ts 70e41f4b71Sopenharmony_ciperformanceMonitor.end("LAUNCHER_APP_LAUNCH_FROM_ICON"); 71e41f4b71Sopenharmony_ci ``` 72