# Bulk Lighthouse & Core Web Vitals Audit — Page Speed (`fetchbase/website-performance-audit`) Actor Measure real performance in a live browser: Core Web Vitals (LCP, CLS, FCP, TTFB), page weight and request breakdown by type, third-party load, DOM size, and prioritized speed opportunities with fixes. Returns a 0–100 score. Charged per page — no startup fee. - **URL**: https://apify.com/fetchbase/website-performance-audit.md - **Developed by:** [Fetchbase](https://apify.com/fetchbase) (community) - **Categories:** Developer tools, SEO tools - **Stats:** 3 total users, 3 monthly users, 100.0% runs succeeded, 0 bookmarks - **User rating**: No ratings yet ## Pricing from $20.00 / 1,000 page auditeds This Actor is paid per event and usage. You are charged both the fixed price for specific events and for Apify platform usage. Learn more: https://docs.apify.com/platform/actors/running/actors-in-store#pay-per-event ## What's an Apify Actor? Actors are web data automations that power AI and operations. They run on the Apify platform to scrape websites, process data, connect APIs, and automate workflows. In Batch mode, an Actor accepts a well-defined JSON input, performs an action which can take anything from a few seconds to a few hours, and optionally produces a well-defined JSON output, datasets with results, or files in key-value store. In Standby mode, an Actor provides a web server which can be used as a website, API, or an MCP server. Actors are written with capital "A". ## How to integrate an Actor? If asked about integration, you help developers integrate Actors into their projects. You adapt to their stack and deliver integrations that are safe, well-documented, and production-ready. The best way to integrate Actors is as follows. - **AI agents and MCP clients** — the [Apify MCP server](https://docs.apify.com/integrations/mcp.md) at `https://mcp.apify.com` (remote, streamable HTTP, OAuth on first use). - **Agentic workflows and local Actor development** — [Agent Skills](https://apify.com/.well-known/agent-skills/index.json) with the [Apify CLI](https://docs.apify.com/cli/docs.md): `npm install -g apify-cli`, then `apify login`. - **JavaScript/TypeScript projects** — the official [JS/TS client](https://docs.apify.com/api/client/js/docs.md): `npm install apify-client`. - **Python projects** — the official [Python client](https://docs.apify.com/api/client/python/docs.md): `pip install apify-client`. - **Any other language** — the [REST API](https://docs.apify.com/api/v2.md). For usage examples, see the [API](#api) section below. For more details, see Apify documentation as [Markdown index](https://docs.apify.com/llms.txt) and [Markdown full-text](https://docs.apify.com/llms-full.txt). # README ## Website Performance Audit — Core Web Vitals & Page Speed Measure how fast a page **really** is, in a live Chromium browser: **Core Web Vitals** (LCP, CLS, FCP, TTFB), full **page weight and request breakdown** by resource type, third-party load, DOM size — plus a **prioritized list of speed opportunities** and a **0–100 score**. Not a meta-tag checker: it loads your page for real and reports what actually slows it down, with the fix for each issue. **Charged per page audited.** No startup fee. Failures cost $0. ### Quick start ```json { "urls": ["https://your-site.com"], "device": "mobile" } ``` → per page: ```json { "url": "https://your-site.com", "score": 72, "lcpMs": 2380, "cls": 0.04, "fcpMs": 1290, "ttfbMs": 410, "loadMs": 3120, "totalKb": 2648, "requests": 84, "thirdPartyRequests": 37, "domNodes": 1120, "renderBlocking": 5, "weightByType": { "document": { "count": 1, "kb": 42 }, "script": { "count": 29, "kb": 1180 }, "image": { "count": 31, "kb": 980 }, "stylesheet": { "count": 6, "kb": 210 }, "font": { "count": 4, "kb": 190 } }, "opportunities": [ { "severity": "warning", "title": "Render-blocking resources", "detail": "5 synchronous scripts/stylesheets in …" }, { "severity": "warning", "title": "Heavy JavaScript", "detail": "Scripts total 1180 KB. Code-split, tree-shake…" } ] } ``` ### What it measures | Group | Details | |---|---| | **Core Web Vitals** | LCP, CLS, FCP, TTFB — measured live with `PerformanceObserver`, scored against Google's thresholds | | **Page weight** | Total transferred bytes + breakdown by type (script / image / css / font / media / other), from real response sizes | | **Requests** | Total count, third-party count | | **DOM** | Element count (excessive-DOM flag) | | **Opportunities** | Render-blocking resources, oversized images, heavy JS, missing text compression, excessive DOM, too many requests, heavy page weight — each with a concrete fix | | **Score** | 0–100 heuristic weighted on Core Web Vitals + weight + requests | | **Device** | Mobile (Google's ranking basis) or desktop emulation | ### Use cases - **Performance monitoring / CI:** audit after each deploy via API; alert when `score` drops or LCP regresses. Run your whole site on a **Schedule** and sort by score. - **Agency & client reports:** a clean, quantified performance snapshot with a fix list. - **Competitive benchmarking:** compare your speed to competitors, at scale. ```bash curl -X POST "https://api.apify.com/v2/acts/fetchbase~website-performance-audit/run-sync-get-dataset-items?token=YOUR_TOKEN" \ -H "Content-Type: application/json" \ -d '{"urls": ["https://example.com"], "device": "mobile"}' ``` ### Pricing A fixed price **per page audited** (full browser render + measurement), plus standard Apify platform usage. Failed audits aren't billed. ### FAQ **How does this differ from Google PageSpeed Insights?** Same Core Web Vitals and opportunity ideas, delivered as a **bulk API** you can run on hundreds of URLs on a schedule, with no rate limits or keys, and consistent lab conditions for tracking trends. **Lab or field data?** Lab — a controlled browser load, comparable to Lighthouse. Best for catching regressions and comparing pages under identical conditions. **Focused on SEO signals instead?** See our companion **SEO Audit** actor — it adds titles, meta, headings, structured data and link checks on top of Core Web Vitals. *** Want an INP measurement, a filmstrip, or a specific Lighthouse audit added? **Open an issue.** A ⭐ review helps others find it. ### More tools by Fetchbase Part of a suite of fast, no-nonsense web utilities — all pay-per-result, charged only on success, no startup fee: - [Website Screenshot API](https://apify.com/fetchbase/web-screenshot-pro) — full-page PNG / JPEG / WebP / PDF - [Website to Markdown](https://apify.com/fetchbase/website-to-markdown) — clean Markdown for LLMs & RAG - [PDF & DOCX to Markdown](https://apify.com/fetchbase/document-to-markdown) — documents → Markdown for RAG - [SEO Audit + Core Web Vitals](https://apify.com/fetchbase/website-seo-audit) — scored on-page audit with fixes - [Website Performance Audit](https://apify.com/fetchbase/website-performance-audit) — bulk Core Web Vitals & page speed - [Tech Stack Detector](https://apify.com/fetchbase/tech-stack-detector) — CMS, frameworks, analytics, hosting - [Domain, DNS & WHOIS Lookup](https://apify.com/fetchbase/domain-dns-intelligence) — records, registration, SSL - [RSS Feed Reader](https://apify.com/fetchbase/rss-feed-reader) — RSS / Atom / JSON → normalized JSON - [Job Postings API](https://apify.com/fetchbase/job-postings-scraper) — Greenhouse, Lever, Ashby & more ### Use with AI agents (MCP) This Actor is callable by AI agents through the [Apify MCP server](https://mcp.apify.com/). Agents in Claude, Cursor, Windsurf, LangGraph, CrewAI and others can discover it via `search-actors` and run it as a tool — its inputs and outputs are fully described in the schema for reliable agent use. *** #### Was this Actor useful? If it saved you time, please consider leaving an honest review. Reviews are the main way independent Actors get discovered on Apify — a single one makes a real difference, and critical feedback is just as welcome as praise. Something missing or broken? Open an issue instead and it will get fixed. # Actor input Schema ## `urls` (type: `array`): Pages to audit. Each produces one performance report (one billable event). ## `device` (type: `string`): Emulate a mobile or desktop viewport for the audit (mobile is what Google's ranking uses). ## `waitUntil` (type: `string`): When to consider the page loaded before measuring. ## `timeoutMs` (type: `integer`): Max time to wait for the page before measuring whatever loaded. ## `proxyConfiguration` (type: `object`): Off by default so timings reflect the real page (proxy latency would distort Core Web Vitals). Enable only if a site blocks datacenter IPs. ## Actor input object example ```json { "urls": [ "https://example.com", "https://www.bbc.com" ], "device": "mobile", "waitUntil": "load", "timeoutMs": 60000, "proxyConfiguration": { "useApifyProxy": false } } ``` # Actor output Schema ## `results` (type: `string`): No description # API You can run this Actor programmatically using our API. Below are code examples in JavaScript, Python, and CLI, as well as the OpenAPI specification and MCP server setup. ## JavaScript example ```javascript import { ApifyClient } from 'apify-client'; // Initialize the ApifyClient with your Apify API token // Replace the '' with your token const client = new ApifyClient({ token: '', }); // Prepare Actor input const input = { "urls": [ "https://www.apify.com" ] }; // Run the Actor and wait for it to finish const run = await client.actor("fetchbase/website-performance-audit").call(input); // Fetch and print Actor results from the run's dataset (if any) console.log('Results from dataset'); console.log(`💾 Check your data here: https://console.apify.com/storage/datasets/${run.defaultDatasetId}`); const { items } = await client.dataset(run.defaultDatasetId).listItems(); items.forEach((item) => { console.dir(item); }); // 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/js/docs ``` ## Python example ```python from apify_client import ApifyClient # Initialize the ApifyClient with your Apify API token # Replace '' with your token. client = ApifyClient("") # Prepare the Actor input run_input = { "urls": ["https://www.apify.com"] } # Run the Actor and wait for it to finish run = client.actor("fetchbase/website-performance-audit").call(run_input=run_input) # Fetch and print Actor results from the run's dataset (if there are any) print("💾 Check your data here: https://console.apify.com/storage/datasets/" + run["defaultDatasetId"]) for item in client.dataset(run["defaultDatasetId"]).iterate_items(): print(item) # 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/python/docs/quick-start ``` ## CLI example ```bash echo '{ "urls": [ "https://www.apify.com" ] }' | apify call fetchbase/website-performance-audit --silent --output-dataset ``` ## MCP server setup ```json { "mcpServers": { "apify": { "command": "npx", "args": [ "mcp-remote", "https://mcp.apify.com/?tools=fetchbase/website-performance-audit", "--header", "Authorization: Bearer " ] } } } ``` ## OpenAPI specification Download the OpenAPI definition: https://api.apify.com/v2/acts/EynO0GXcnEu7b41LZ/builds/t9edCY7UuZZdHWRSn/openapi.json