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get_render_blocking_details

MCP tool from Pagespeed Insights MCP by ruslanlap

Render-blocking resources and critical request chains

How to use it

Project documentation lists get_render_blocking_details for the Pagespeed Insights MCP MCP server. Add the server to your MCP client (Claude Desktop, Cursor, Windsurf and others), then check which tools your installed version makes available. Tool availability can depend on configuration and credentials. A server handshake does not verify this tool’s behavior. See the full listing for setup details.

Install Pagespeed Insights MCP

$npx pagespeed-insights-mcp

FULL PAGESPEED INSIGHTS MCP LISTING

Other tools in Pagespeed Insights MCP (30)

analyze_page_speed

Full Lighthouse analysis — all metrics and audits

Analyze up to 10 URLs in parallel with progress tracking

array of categories to audit (default: ["performance", "accessibility", "best-practices", "seo"])

array of categories ["performance", "accessibility", "best-practices", "seo", "pwa"]

Clear internal cache to force fresh API requests

Side-by-side performance comparison between two URLs

Real-world Core Web Vitals from Chrome UX Report (field data)

"PHONE", "DESKTOP", or "TABLET" (default: "PHONE")

Run pagespeedanalyzepage and pagespeedgetfielddata; lab and field data stay explicit rather than being mixed.

get_element_analysis

LCP/CLS DOM elements causing performance issues

Complete Lighthouse audit for all categories

get_image_optimization_details

Images needing optimization with exact savings

get_javascript_analysis

JS bootup time, main-thread work, unused & duplicated modules

get_network_analysis

Network waterfall — all requests with timing and size

get_origin_crux

Domain-level (origin) Chrome UX Report field data across all pages

get_performance_map

Mermaid flowchart visualizing performance score, Core Web Vitals status, and top opportunities

get_performance_summary

Simplified key-metrics report

get_recommendations

Prioritized recommendations with actionable fixes

get_third_party_impact

Third-party script impact grouped by provider

get_visual_analysis

Screenshots, filmstrip, and full-page captures

pagespeed_analyze_batch

Triage 1–10 pages with progress notifications when supported.

pagespeed_analyze_page

One-page Lighthouse health check, full report, recommendations, audit findings, or a Mermaid map (report).

pagespeed_clear_cache

Clear this process's in-memory API cache after a deploy.

pagespeed_compare_pages

Compare two pages now, or compare one page with its saved baseline (mode).

pagespeed_diagnose_page

One focused investigation: visual, elements, network, javascript, images, render-blocking, or third-parties.

pagespeed_get_field_data

CrUX real-user Core Web Vitals for a page or origin.

"mobile" or "desktop" (default: "mobile")

(required): First URL to compare

(required): Second URL to compare

(required): Array of URLs to analyze (max 10)