> ## Documentation Index > Fetch the complete documentation index at: https://aisa.one/docs/llms.txt > Use this file to discover all available pages before exploring further. # OnPage API Waterfall > This endpoint is designed to provide you with the page speed insights. ## OpenAPI ````yaml openapi/dataforseo.json POST /dataforseo/on_page/waterfall openapi: 3.0.3 info: title: DataForSEO API version: 1.0.0 description: DataForSEO API endpoints exposed through the AIsa unified gateway. servers: - url: https://api.aisa.one/apis/v1 security: - BearerAuth: [] paths: /dataforseo/on_page/waterfall: post: summary: OnPage API Waterfall description: >- This endpoint is designed to provide you with the page speed insights. Using this function you can get detailed information about the page loading time, time to secure connection, the time it takes to load page resources, and so on. operationId: post_dataforseo_on_page_waterfall requestBody: required: true content: application/json: schema: type: object properties: id: type: string description: >- ID of the task required field you can get this ID in the response of the Task POST endpoint example: “07131248-1535-0216-1000-17384017ad04” url: type: string description: >- page URL required field specify the pages you want to receive timing for tag: type: string description: >- user-defined task identifier optional field the character limit is 255 you can use this parameter to identify the task and match it with the result you will find the specified tag value in the data object of the response required: - id - url responses: '200': description: Successful response content: application/json: schema: type: object properties: version: type: string description: the current version of the API status_code: type: integer description: >- general status code you can find the full list of the response codes here Note: we strongly recommend designing a necessary system for handling related exceptional or error conditions status_message: type: string description: >- general informational message you can find the full list of general informational messages here time: type: string description: execution time, seconds cost: type: number description: total tasks cost, USD tasks_count: type: integer description: the number of tasks in the tasks array tasks_error: type: integer description: >- the number of tasks in the tasks array returned with an error tasks: type: array items: type: string description: array of tasks tasks.id: type: string description: >- task identifier unique task identifier in our system in the UUID format tasks.status_code: type: integer description: >- status code of the task generated by DataForSEO; can be within the following range: 10000-60000 you can find the full list of the response codes here tasks.status_message: type: string description: >- informational message of the task you can find the full list of general informational messages here tasks.time: type: string description: execution time, seconds tasks.cost: type: number description: cost of the task, USD tasks.result_count: type: integer description: number of elements in the result array tasks.path: type: array items: type: string description: URL path tasks.data: type: object description: >- contains the same parameters that you specified in the POST request tasks.result: type: array items: type: string description: array of results tasks.result.crawl_progress: type: string description: >- status of the crawling session possible values: in_progress, finished tasks.result.crawl_status: type: object description: details of the crawling session tasks.result.crawl_status.max_crawl_pages: type: integer description: >- maximum number of pages to crawl indicates the max_crawl_pages limit you specified when setting a task tasks.result.crawl_status.pages_in_queue: type: integer description: number of pages that are currently in the crawling queue tasks.result.crawl_status.pages_crawled: type: integer description: number of crawled pages tasks.result.items_count: type: integer description: number of items in the results array tasks.result.items: type: array items: type: string description: items array tasks.result.items.page_url: type: string description: URL of the page tasks.result.items.time_to_interactive: type: integer description: >- Time To Interactive (TTI) metric the time it takes until the user can interact with a page (in milliseconds) tasks.result.items.dom_complete: type: integer description: >- time to load resources the time it takes until the page and all of its subresources are downloaded (in milliseconds) tasks.result.items.connection_time: type: integer description: >- time to connect to a server the time it takes until the connection with a server is established (in milliseconds) tasks.result.items.time_to_secure_connection: type: integer description: >- time to establish a secure connection the time it takes until the secure connection with a server is established (in milliseconds) tasks.result.items.request_sent_time: type: integer description: >- time to send a request to a server the time it takes until the request to a server is sent (in milliseconds) tasks.result.items.waiting_time: type: integer description: time to first byte (TTFB) in milliseconds tasks.result.items.download_time: type: integer description: >- time it takes for a browser to receive a response (in milliseconds) tasks.result.items.duration_time: type: integer description: >- total time it takes until a browser receives a complete response from a server (in milliseconds) tasks.result.items.fetch_start: type: integer description: >- time to start downloading the HTML resource the amount of time the browser needs to start downloading a page tasks.result.items.fetch_end: type: integer description: >- time to complete downloading the HTML resource the amount of time the browser needs to complete downloading a page tasks.result.items.resources: type: array items: type: string description: >- resource-specific timing contains separate arrays with timing for each resource found on the page tasks.result.items.resources.resource_type: type: string description: type of the returned resource tasks.result.items.resources.url: type: string description: resource URL tasks.result.items.resources.initiator: type: string description: resource initiator tasks.result.items.resources.duration_time: type: integer description: >- total time it takes until a browser receives a complete response from a server (in milliseconds) tasks.result.items.resources.fetch_start: type: integer description: >- time to start downloading the resource the amount of time the browser needs to start downloading a resource tasks.result.items.resources.fetch_end: type: integer description: >- time to complete downloading the resource the amount of time the browser needs to complete downloading a resource tasks.result.items.resources.location: type: object description: >- location of the resource in the document parameters defining the location of the specific resource within the document’s HTML tasks.result.items.resources.location.line: type: integer description: >- line number the number of the line on which the resource is located tasks.result.items.resources.location.offset_left: type: integer description: >- position in line the number of line characters before the resource; sometimes referred to as column Note: counts from 1, i.e. if the resource doesn’t have any characters to the left, the value will be 1 tasks.result.items.resources.location.offset_top: type: integer description: >- position in the document the total number of characters between the resource and the top of HTML tasks.result.items.resources.is_render_blocking: type: boolean description: indicates whether the resource blocks rendering '400': description: Bad request '401': description: Unauthorized '429': description: Rate limit exceeded '500': description: Internal server error components: securitySchemes: BearerAuth: type: http scheme: bearer ````