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https://FairfieldConcrete.org

Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
84
GRADE
B
FIX
2
REVIEW
8
PASS
13
INFO
3

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
63
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

3.46 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

9.51 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

163 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

4.87 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

9.51 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
26
13 PASS 8 REVIEW 2 FIX
F
Page Weight Budget
Action
4.0 MB transferred, 17 requests
FIX
4.0 MB transferred, 17 requests
Critical::
Page weighs 4.8 MB (4.0 MB transferred)
Warning::
Images are 3.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.5 MB
Info::
17 HTTP requests
Info::
Estimated 0.83 g CO2 per page load
4.0 MB / 2.4 MB budget
4.0 MB transferred
17 requests
0.83 g CO2 per page load
Images 3.5 MiB 87%
JavaScript 428.7 KiB 11%
Fonts 94.8 KiB 2%
HTML 7.8 KiB 0%
CSS 1.0 KiB 0%
Other 641 B 0%
Other 554 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

D
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Image Optimization
8 images, 0 KB saveable
REVIEW
8 images, 0 KB saveable
Info::
All images are well-optimized
8 images 3.5 MB
0 oversized -0 KB
8 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
798ms total JS execution
REVIEW
798ms total JS execution
Info::
https://www.googletagmanager.com/gtag/js?id=G-M2PQ...: 229ms CPU time
Info::
Unattributable: 204ms CPU time
Info::
https://fairfieldconcrete.org/: 200ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-P33...: 108ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-M2PQ...: 58ms CPU time
Info::
Third-party scripts: 394ms (49% of total)

Main Thread Breakdown

Script Evaluation 38% Other 28% Style & Layout 17% Script Parsing & Compilation 13%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtag/js?id=G-M2PQ1KSEJB229ms187ms40ms3rd
Unattributable204ms5ms0ms1st
https://fairfieldconcrete.org/200ms11ms2ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-P3366BT8108ms80ms24ms3rd
https://www.googletagmanager.com/gtag/js?id=G-M2PQ1KSEJB&cx=c&gtm=4e65m158ms21ms37ms3rd
C
JS Bundles
Action
3 scripts, 247 KB unused
REVIEW
3 scripts, 247 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-M2PQ...: 110 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-P33...: 70 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-M2PQ...: 67 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 247 KB
247 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-M2PQ1KSEJB&cx=c&gtm=4e65m1158 KB110 KB (70%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P3366BT8113 KB70 KB (62%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-M2PQ1KSEJB158 KB67 KB (43%)✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
B
Compression Algorithm
Main response uses gzip; brotli would be ~20% smaller
REVIEW
Main response uses gzip; brotli would be ~20% smaller
Info::
Main HTML response uses gzip (brotli would be ~20% smaller)
All current browsers support brotli. Most CDNs (Cloudflare, Fastly, AWS CloudFront, Vercel, Netlify) can switch from gzip to brotli with a single config flag. Origin servers (nginx, Apache) need a brotli module compiled in -- nginx-brotli or Apache mod_brotli.
B
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
No Cache-Control header on main HTML response
Info::
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
C
Page Weight Inventory
Action
17 resources · 4.0 MB · 247 KB savings available
REVIEW
17 resources · 4.0 MB · 247 KB savings available
Warning::
Page weight 4.0 MB exceeds 1 MB target by 3.0 MB
Got: 4.0 MB Expected: ≤ 1 MB
Info::
~247 KB of savings available
Info::
7 third-party resources (13% of weight)
Info::
7 resources over 200KB
17 resources · 4.0 MiB · 7 third-party 3.0 MiB over 1MB target
Image 87% · 3.5 MiB
JavaScript 11% · 428.7 KiB
Font 2% · 94.8 KiB
Document 0% · 8.4 KiB
CSS 0% · 1.0 KiB
Other 0% · 554 B

~247.3 KiB of savings available

Remove unused JavaScript: 247.3 KiB
A+
Third-Party Impact
13% third-party, 0 ms blocking
PASS
13% third-party, 0 ms blocking
Info::
Third-party code accounts for 13% of page weight (525.1 KiB of 4.0 MiB)
Info::
Third-party blocking time is low (0 ms)
87%
First-party Third-party
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
2 fonts (95 KB)
PASS
2 fonts (95 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

95 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 3.5 s LCP 9.5 shttps://fonts.gstatic.com/s/figtree/v9/_Xms-HUzqDCFdgfMm4S9DaRvzig.woff2_Xms-HUzqDCFdgfMm4S9DaR... https://fonts.gstatic.com/s/figtree/v9/_Xms-HUzqDCFdgfMm4S9DaRvzig.woff2 — 19.7 KiB — 90 ms — font-display: swaphttps://fonts.gstatic.com/s/bricolagegrotesque/v9/3y9K6as8bTXq_nANBjzKo3IeZx8z6up5BeSl9D4dj_x9PpZBMlGIInHWVyNJ.woff23y9K6as8bTXq_nANBjzKo3I... https://fonts.gstatic.com/s/bricolagegrotesque/v9/3y9K6as8bTXq_nANBjzKo3IeZx8z6up5BeSl9D4dj_x9PpZBMlGIInHWVyNJ.woff2 — 75.1 KiB — 107 ms — font-display: swap
_Xms-HUzqDCFdgfMm4S9DaR... woff2 swap
Size 20 KB
Load time 90 ms
Start 536 ms
Risk FOUT — text flashes from fallback to web font
3y9K6as8bTXq_nANBjzKo3I... woff2 swap
Size 75 KB
Load time 107 ms
Start 537 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
2
preload
—
dns-prefetch
—
prefetch
—

2 resource hints configured

A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Warning::
Compressed response missing `Vary` header
The page is served with `Content-Encoding: gzip` but has no `Vary` header. Without `Vary: Accept-Encoding`, intermediary caches (corporate proxies, ISP caches) may serve the compressed variant to clients that didn't send the matching `Accept-Encoding` -- the client sees garbled bytes. Add `Vary: Accept-Encoding` whenever the response is conditionally compressed.
Info::
Both `ETag` and `Last-Modified` present -- efficient revalidation supported
The page returns both `ETag` (content hash) and `Last-Modified` (timestamp) headers. Browsers can issue conditional GETs with `If-None-Match` or `If-Modified-Since`; the server returns 304 Not Modified for unchanged content, saving bandwidth. ETag is the more reliable of the two (timestamps fail in DST transitions and clock skew).
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A+
JavaScript Blocking
No render-blocking JS or document.write usage detected
PASS
No render-blocking JS or document.write usage detected
Info::
No JavaScript blocking issues detected
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Hostinger

Network Waterfall
17 requests over 1802ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 3.5 s LCP 9.5 shttps://fairfieldconcrete.org// https://fairfieldconcrete.org/ — 200 — 7.8 KiB — 313 ms — h2https://www.googletagmanager.com/gtag/js?id=G-M2PQ1KSEJBwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-M2PQ1KSEJB — 200 — 157.9 KiB — 334 ms — h2https://fonts.googleapis.com/css2?family=Bricolage+Grotesque:opsz,wght@12..96,500..800&family=Figtree:wght@400..700&display=swapfonts.googleapis.com/css2?family=Br... https://fonts.googleapis.com/css2?family=Bricolage+Grotesque:opsz,wght@12..96,500..800&family=Figtree:wght@400..700&display=swap — 200 — 1.0 KiB — 195 ms — h2https://fairfieldconcrete.org/images/web-img_0701.jpg/images/web-img_0701.jpg https://fairfieldconcrete.org/images/web-img_0701.jpg — 200 — 684.7 KiB — 556 ms — h2https://fairfieldconcrete.org/images/logo-web.png/images/logo-web.png https://fairfieldconcrete.org/images/logo-web.png — 200 — 133.3 KiB — 507 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-P3366BT8www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-P3366BT8 — 200 — 112.9 KiB — 313 ms — h2https://fonts.gstatic.com/s/figtree/v9/_Xms-HUzqDCFdgfMm4S9DaRvzig.woff2fonts.gstatic.com/s/figtree/v9/_Xms... https://fonts.gstatic.com/s/figtree/v9/_Xms-HUzqDCFdgfMm4S9DaRvzig.woff2 — 200 — 19.7 KiB — 90 ms — h3https://fonts.gstatic.com/s/bricolagegrotesque/v9/3y9K6as8bTXq_nANBjzKo3IeZx8z6up5BeSl9D4dj_x9PpZBMlGIInHWVyNJ.woff2fonts.gstatic.com/s/bricolagegrotes... https://fonts.gstatic.com/s/bricolagegrotesque/v9/3y9K6as8bTXq_nANBjzKo3IeZx8z6up5BeSl9D4dj_x9PpZBMlGIInHWVyNJ.woff2 — 200 — 75.1 KiB — 107 ms — h3https://www.googletagmanager.com/gtag/js?id=G-M2PQ1KSEJB&cx=c&gtm=4e65m1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-M2PQ1KSEJB&cx=c&gtm=4e65m1 — 200 — 157.9 KiB — 125 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-M2PQ1KSEJB&gtm=45je65m1v9253667379za200zb9253664584zd9253664584&_p=1779857625282&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1691278294.1779857626&frm=0&pscdl=noapi&rcb=6&sr=412x823&uaa=&uab=64&uafvl=Not%252FA)Brand%3B99.0.0.0%7CChromium%3B148.0.7778.178&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938468~118689381~119034492&sid=1779857625&sct=1&seg=0&dl=https%3A%2F%2Ffairfieldconcrete.org%2F&dt=Concrete%20Contractor%20in%20Fairfield%2C%20CA%20%7C%20Fairfield%20Concrete%20Co.&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=756region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-M2PQ1KSEJB&gtm=45je65m1v9253667379za200zb9253664584zd9253664584&_p=1779857625282&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1691278294.1779857626&frm=0&pscdl=noapi&rcb=6&sr=412x823&uaa=&uab=64&uafvl=Not%252FA)Brand%3B99.0.0.0%7CChromium%3B148.0.7778.178&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938468~118689381~119034492&sid=1779857625&sct=1&seg=0&dl=https%3A%2F%2Ffairfieldconcrete.org%2F&dt=Concrete%20Contractor%20in%20Fairfield%2C%20CA%20%7C%20Fairfield%20Concrete%20Co.&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=756 — 204 — 554 B — 99 ms — h2https://fairfieldconcrete.org/favicon.ico/favicon.ico https://fairfieldconcrete.org/favicon.ico — 404 — 641 B — 104 ms — h2https://fairfieldconcrete.org/images/web-img_1493.jpg/images/web-img_1493.jpg https://fairfieldconcrete.org/images/web-img_1493.jpg — 200 — 518.1 KiB — 208 ms — h2https://fairfieldconcrete.org/images/web-img_1623.jpg/images/web-img_1623.jpg https://fairfieldconcrete.org/images/web-img_1623.jpg — 200 — 205.2 KiB — 211 ms — h2https://fairfieldconcrete.org/images/web-img_0683.jpg/images/web-img_0683.jpg https://fairfieldconcrete.org/images/web-img_0683.jpg — 200 — 408.7 KiB — 220 ms — h2https://fairfieldconcrete.org/images/web-stamped-patio.jpg/images/web-stamped-patio.jpg https://fairfieldconcrete.org/images/web-stamped-patio.jpg — 200 — 432.2 KiB — 313 ms — h2https://fairfieldconcrete.org/images/web-img_3574.jpg/images/web-img_3574.jpg https://fairfieldconcrete.org/images/web-img_3574.jpg — 200 — 623.8 KiB — 327 ms — h2https://fairfieldconcrete.org/images/web-img_3423.jpg/images/web-img_3423.jpg https://fairfieldconcrete.org/images/web-img_3423.jpg — 200 — 535.2 KiB — 338 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
49% of JavaScript execution is third-party
First-party Third-party 394ms · 429KB · €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 229ms
Transfer 158 KB
Unused 43%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 108ms
Transfer 113 KB
Unused 62%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 58ms
Transfer 158 KB
Unused 70%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 229ms and costs ~€2/month

49% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Google Tag Manager takes 229ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

62% of Google Tag Manager's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

70% of Google Tag Manager's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

Image Optimization
14 images, 2945 KB total, 1410 KB wasted
INFO

Image Optimization Audit

Total Images

14

Total Size

2945 KB

Oversized

4

Wasted

1410 KB

12 missing dimensions 1 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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