The Metrics That Matter

Monitor Every Core Web Vital

Google uses Core Web Vitals as a direct ranking signal. SEObolt's page speed tracker monitors all three vitals for every URL you care about — on both desktop and mobile.

2.1s

Largest Contentful Paint (LCP)

Measures how long the largest visible element takes to render. Slow LCP means users see a blank page too long.

≤ 2.5s ≤ 4.0s > 4.0s

120ms

Interaction to Next Paint (INP)

Measures responsiveness to user interactions. High INP means clicks and taps feel sluggish and unresponsive.

≤ 200ms ≤ 500ms > 500ms

0.04

Cumulative Layout Shift (CLS)

Measures visual stability. High CLS means elements jump around as the page loads, frustrating users and hurting conversions.

≤ 0.1 ≤ 0.25 > 0.25

Dual Device Tracking

Desktop vs. Mobile Performance Comparison

Your site loads differently on a phone than a desktop. SEObolt's website speed test runs separate analyses for each device type, so you can spot mobile-only bottlenecks that tank your rankings in mobile search.

✓ Side-by-side scores: Compare desktop and mobile performance scores for any URL in one view
✓ Mobile-first insight: Google indexes mobile-first — see exactly what their crawler experiences
✓ Device-specific bottlenecks: Identify issues that only appear on mobile, like oversized images or render-blocking scripts
✓ Trend comparison: Track how desktop and mobile scores diverge or converge over time

2x

every URL tested on both desktop and mobile

60%

of web traffic is mobile — mobile speed is critical

0–100

performance score tracked for every scan

88 Performance

Score Breakdown

Performance

Accessibility

Best Practices

SEO

Trend Analysis

Historical Performance Data

A single speed test is a snapshot. SEObolt gives you the full story. Our core web vitals tool stores every scan result and plots performance trends over time, so you can correlate speed changes with ranking movements.

✓ Trend charts: Visualize how LCP, INP, CLS, and overall score change week over week
✓ Before & after: Measure the real impact of speed optimizations with clear data
✓ Regression alerts: Spot when a deploy or plugin update tanks your page speed
✓ Correlate with rankings: Overlay speed data with your keyword rankings to see the direct impact

Actionable Diagnostics

Identify Speed Bottlenecks and Fix Them

Knowing your score is step one. SEObolt goes further — powered by the Google PageSpeed Insights API, every scan surfaces specific optimization opportunities ranked by potential impact.

📸

Render-Blocking Resources

Identify CSS and JavaScript files that delay first paint. See exactly which scripts to defer, async, or inline for faster rendering.

🖼

Image Optimization

Detect oversized images, missing next-gen formats (WebP/AVIF), and uncompressed assets. Pair with our SEO analysis for full image audits.

⚡

Server Response Time

Monitor Time to First Byte (TTFB) across scans. Catch slow hosting, unoptimized databases, or missing caching before they hurt rankings.

📦

Unused JavaScript

Find JavaScript bundles that ship dead code to the browser. Reduce payload size by trimming what you do not need.

📄

DOM Size & Complexity

Large DOM trees slow down rendering and interaction. See if your page structure is bloated and get recommendations to simplify it.

🕑

Third-Party Impact

Measure how analytics, ads, chat widgets, and other third-party scripts affect your load time. Quantify the cost of each embed.

Why It Matters

Core Web Vitals Are a Google Ranking Factor

Since 2021, Google has used Core Web Vitals as a confirmed ranking signal in its Page Experience update. Pages that pass all three thresholds gain a competitive edge in search results — especially in competitive niches where small ranking differences translate to significant traffic.

Yet most site owners check their speed once, make a few fixes, and never look again. Performance degrades silently — a new plugin, a theme update, a third-party script change — and rankings slip. SEObolt's core web vitals monitor catches these regressions the moment they happen.

✓ Confirmed ranking signal: Google's Page Experience system uses LCP, INP, and CLS directly
✓ Tiebreaker in SERPs: When content quality is equal, faster pages rank higher
✓ User experience impact: 53% of mobile visitors abandon sites that take over 3 seconds to load
✓ Part of the 23-tool suite: Combine speed data with rank tracking, SEO audits, and LLM visibility for a complete picture

📈

Performance Score 0–100 Lighthouse-based composite score updated with every scan

📱

Mobile-First Analysis Separate mobile audits reflecting how Google actually crawls your site

📋

Multi-Page Monitoring Track dozens of URLs across your site, not just the homepage

📅

Historical Trend Data Full performance history so you can measure the impact of every change

⚠️

Regression Detection Spot score drops immediately after deploys, updates, or config changes

🚀

PageSpeed Insights API Powered by the same engine Google uses to evaluate your pages

Explore More Features

LLM Rank Tracker → Keyword Rank Tracking → 57-Point SEO Audit → AI Content Optimizer →

Track Page Speed and Core Web Vitals Over Time