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Performance

· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
4
REVIEW
4
PASS
15
INFO
4

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

Mobile Desktop
83
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

1.46 s

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

1.91 s

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

619 ms

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

0.034

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

2.43 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.

14.47 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
27
15 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
2.7 MB transferred, 65 requests
FIX
2.7 MB transferred, 65 requests
Warning::
Page weighs 7.5 MB (2.7 MB transferred)
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
Fonts are 479 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 479 KB
Info::
65 HTTP requests
Info::
Estimated 0.56 g CO2 per page load
2.7 MB / 2.4 MB budget
2.7 MB transferred
65 requests
0.56 g CO2 per page load
JavaScript 1.1 MiB 43%
Images 890.3 KiB 33%
Fonts 479.1 KiB 18%
CSS 102.1 KiB 4%
HTML 59.2 KiB 2%
Other 6.4 KiB 0%
Other 1.2 KiB 0%
Other 601 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

D
JS Execution Cost
Action
2858ms total JS execution
FIX
2858ms total JS execution
Warning::
https://www.gstatic.com/recaptcha/releases/MerVUtR...: 1142ms CPU time
Warning::
https://improvingliteracy.org/: 588ms CPU time
Warning::
Unattributable: 373ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=GT-NBX...: 265ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-9162...: 157ms CPU time
Warning::
Third-party scripts: 1742ms (61% of total)

Main Thread Breakdown

Script Evaluation 52% Other 19% Style & Layout 13% Script Parsing & Compilation 10% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.gstatic.com/recaptcha/releases/MerVUtRoajKEbP7pLiGXkL28/recaptcha__en.js1142ms983ms77ms3rd
https://improvingliteracy.org/588ms11ms7ms1st
Unattributable373ms7ms0ms1st
https://www.googletagmanager.com/gtag/js?id=GT-NBXLK7SQ265ms225ms39ms3rd
https://www.googletagmanager.com/gtag/js?id=G-91625057&cx=c&gtm=4e66h0157ms125ms31ms3rd
https://improvingliteracy.org/wp-content/themes/bricks/assets/js/bricks.min.js?ver=1782144720155ms62ms16ms1st
https://static.ctctcdn.com/js/signup-form-widget/current/signup-form-widget.min.js125ms15ms110ms3rd
https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.1/jquery.min.js54ms42ms8ms3rd
F
JS Bundles
Action
15 scripts, 884 KB unused
FIX
15 scripts, 884 KB unused
Warning::
https://www.gstatic.com/recaptcha/releases/MerVUtR...: 170 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/MerVUtR...: 170 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/MerVUtR...: 170 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/MerVUtR...: 170 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-9162...: 67 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 884 KB
884 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/MerVUtRoajKEbP7pLiGXkL28/recaptcha__en.js376 KB170 KB (45%)✓3rd
https://www.gstatic.com/recaptcha/releases/MerVUtRoajKEbP7pLiGXkL28/recaptcha__en.js0 KB170 KB (45%)✓3rd
https://www.gstatic.com/recaptcha/releases/MerVUtRoajKEbP7pLiGXkL28/recaptcha__en.js0 KB170 KB (45%)✓3rd
https://www.gstatic.com/recaptcha/releases/MerVUtRoajKEbP7pLiGXkL28/recaptcha__en.js375 KB170 KB (45%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-91625057&cx=c&gtm=4e66h0139 KB67 KB (48%)✓3rd
https://www.googletagmanager.com/gtag/js?id=GT-NBXLK7SQ158 KB66 KB (42%)✓3rd
https://improvingliteracy.org/wp-content/themes/bricks/assets/js/bricks.min.js?ver=178214472047 KB39 KB (84%)✓1st
https://static.ctctcdn.com/js/signup-form-widget/current/signup-form-widget.min.js37 KB34 KB (93%)✓3rd
https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.1/jquery.min.js27 KB—✓3rd
https://www.google.com/recaptcha/api.js?onload=ctctOnLoadCallback&render=explicit1 KB—✓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

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

F
Page Weight Inventory
Action
65 resources · 2.7 MB · 884 KB savings available
FIX
65 resources · 2.7 MB · 884 KB savings available
Warning::
Page weight 2.7 MB exceeds 1 MB target by 1.7 MB
Got: 2.7 MB Expected: ≤ 1 MB
Info::
~884 KB of savings available
Warning::
28 third-party resources (47% of weight)
Info::
2 resources over 200KB
65 resources · 2.7 MiB · 28 third-party 1.7 MiB over 1MB target
JavaScript 43% · 1.1 MiB
Image 33% · 891.5 KiB
Font 18% · 479.1 KiB
CSS 4% · 102.1 KiB
Document 2% · 59.2 KiB
Other 0% · 7.0 KiB

~884.5 KiB of savings available

Remove unused JavaScript: 884.5 KiB
B
Third-Party Impact
47% third-party, 0 ms blocking
REVIEW
47% third-party, 0 ms blocking
Info::
Third-party code accounts for 47% of page weight (1.2 MiB of 2.7 MiB)
Info::
Third-party blocking time is low (0 ms)
53%
47%
First-party Third-party
B
Image Optimization
23 images, 0 KB saveable
REVIEW
23 images, 0 KB saveable
Info::
All images are well-optimized
23 images 890 KB
0 oversized -0 KB
9 legacy format
0 missing dimensions CLS risk
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.
B
HTTP Caching
public, max-age=0, s-maxage=86400
REVIEW
public, max-age=0, s-maxage=86400
Info::
Cache-Control header is set
Got: public, max-age=0, s-maxage=86400
Info::
CDN TTL: 1 day (s-maxage=86400)
Info::
Last-Modified header present
Cache-Control

public, max-age=0, s-maxage=86400

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
s-maxage86400CDN caches for 1 day
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
11 fonts (479 KB)
PASS
11 fonts (479 KB)
Info::
11 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

11

479 KB total

Render-blocking

0

of 11

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.5 s LCP 1.9 shttps://improvingliteracy.org/wp-content/uploads/2025/12/poppins-700-normal.woff2poppins-700-normal.woff2 https://improvingliteracy.org/wp-content/uploads/2025/12/poppins-700-normal.woff2 — 8.2 KiB — 124 ms — font-display: swaphttps://improvingliteracy.org/wp-content/uploads/2025/12/inter-400-normal.woff2inter-400-normal.woff2 https://improvingliteracy.org/wp-content/uploads/2025/12/inter-400-normal.woff2 — 47.9 KiB — 125 ms — font-display: swaphttps://improvingliteracy.org/wp-content/uploads/2025/12/inter-700-normal.woff2inter-700-normal.woff2 https://improvingliteracy.org/wp-content/uploads/2025/12/inter-700-normal.woff2 — 47.9 KiB — 143 ms — font-display: swaphttps://improvingliteracy.org/wp-content/themes/bricks/assets/fonts/fontawesome/fa-solid-900.woff2fa-solid-900.woff2 https://improvingliteracy.org/wp-content/themes/bricks/assets/fonts/fontawesome/fa-solid-900.woff2 — 153.4 KiB — 150 ms — font-display: swaphttps://improvingliteracy.org/wp-content/uploads/2025/12/inter-600-normal.woff2inter-600-normal.woff2 https://improvingliteracy.org/wp-content/uploads/2025/12/inter-600-normal.woff2 — 47.9 KiB — 153 ms — font-display: swaphttps://improvingliteracy.org/wp-content/uploads/2025/12/poppins-800-normal.woff2poppins-800-normal.woff2 https://improvingliteracy.org/wp-content/uploads/2025/12/poppins-800-normal.woff2 — 8.2 KiB — 152 ms — font-display: swaphttps://improvingliteracy.org/wp-content/themes/bricks/assets/fonts/fontawesome/fa-brands-400.woff2fa-brands-400.woff2 https://improvingliteracy.org/wp-content/themes/bricks/assets/fonts/fontawesome/fa-brands-400.woff2 — 115.2 KiB — 166 ms — font-display: swaphttps://improvingliteracy.org/wp-content/uploads/2025/12/poppins-500-normal.woff2poppins-500-normal.woff2 https://improvingliteracy.org/wp-content/uploads/2025/12/poppins-500-normal.woff2 — 8.1 KiB — 53 ms — font-display: swaphttps://improvingliteracy.org/wp-content/uploads/2025/12/poppins-600-normal.woff2poppins-600-normal.woff2 https://improvingliteracy.org/wp-content/uploads/2025/12/poppins-600-normal.woff2 — 8.4 KiB — 55 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 137 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 0 ms — font-display: swap
poppins-700-normal.woff2 woff2 swap
Size 8 KB
Load time 124 ms
Start 281 ms
Risk FOUT — text flashes from fallback to web font
inter-400-normal.woff2 woff2 swap
Size 48 KB
Load time 125 ms
Start 281 ms
Risk FOUT — text flashes from fallback to web font
inter-700-normal.woff2 woff2 swap
Size 48 KB
Load time 143 ms
Start 282 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 153 KB
Load time 150 ms
Start 283 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
inter-600-normal.woff2 woff2 swap
Size 48 KB
Load time 153 ms
Start 284 ms
Risk FOUT — text flashes from fallback to web font
poppins-800-normal.woff2 woff2 swap
Size 8 KB
Load time 152 ms
Start 284 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 115 KB
Load time 166 ms
Start 285 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
poppins-500-normal.woff2 woff2 swap
Size 8 KB
Load time 53 ms
Start 633 ms
Risk FOUT — text flashes from fallback to web font
poppins-600-normal.woff2 woff2 swap
Size 8 KB
Load time 55 ms
Start 633 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 137 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 0 ms
Start 2.5 s
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)

Fixing the unchecked items could save ~134 KB and ~268 ms

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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
—
preload
—
dns-prefetch
1
prefetch
—

1 resource hints configured

A+
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
PASS
HTTP/3 advertised via Alt-Svc
Info::
HTTP/3 (QUIC) is supported
First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.
A+
Compression Algorithm
Main response uses brotli
PASS
Main response uses brotli
Info::
Main HTML response uses brotli (Content-Encoding: br)
Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.
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+
Main HTML Cache-Control
Main HTML max-age=0 (≤ 5min) is appropriate
PASS
Main HTML max-age=0 (≤ 5min) is appropriate
Info::
Main HTML max-age=0 (≤ 5min) is appropriate
Got: public, max-age=0, s-maxage=86400
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: Accept-Encoding
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
`Last-Modified` present -- timestamp-based conditional GET supported
Consider also setting `ETag` for stronger revalidation -- ETags are content hashes that don't suffer from clock-skew or DST issues. Last-Modified alone is functional for conditional GETs and not a bug.
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
1 JS blocking issue(s) detected
PASS
1 JS blocking issue(s) detected
Warning::
1 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
A
CSS Performance Depth
1 CSS depth issue(s) detected
PASS
1 CSS depth issue(s) detected
Warning::
6 render-blocking stylesheet(s) -- recommended: <=3
Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Something Familiar

Network Waterfall
65 requests over 2858ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.5 s LCP 1.9 shttps://improvingliteracy.org// https://improvingliteracy.org/ — 200 — 29.3 KiB — 109 ms — h2https://improvingliteracy.org/wp-content/themes/bricks/assets/css/frontend-layer.min.css?ver=1782144720/wp-content/themes/bricks/assets/cs... https://improvingliteracy.org/wp-content/themes/bricks/assets/css/frontend-layer.min.css?ver=1782144720 — 200 — 24.7 KiB — 74 ms — h2https://improvingliteracy.org/wp-content/themes/bricks/assets/css/libs/font-awesome-6-brands-layer.min.css?ver=1782144720/wp-content/themes/bricks/assets/cs... https://improvingliteracy.org/wp-content/themes/bricks/assets/css/libs/font-awesome-6-brands-layer.min.css?ver=1782144720 — 200 — 5.1 KiB — 92 ms — h2https://improvingliteracy.org/wp-content/themes/bricks/assets/css/libs/font-awesome-6-layer.min.css?ver=1782144720/wp-content/themes/bricks/assets/cs... https://improvingliteracy.org/wp-content/themes/bricks/assets/css/libs/font-awesome-6-layer.min.css?ver=1782144720 — 200 — 19.0 KiB — 56 ms — h2https://improvingliteracy.org/wp-content/themes/bricks/assets/css/libs/ionicons-layer.min.css?ver=1782144720/wp-content/themes/bricks/assets/cs... https://improvingliteracy.org/wp-content/themes/bricks/assets/css/libs/ionicons-layer.min.css?ver=1782144720 — 200 — 5.2 KiB — 73 ms — h2https://improvingliteracy.org/wp-content/uploads/bricks/css/style-manager.min.css?ver=1782231295/wp-content/uploads/bricks/css/styl... https://improvingliteracy.org/wp-content/uploads/bricks/css/style-manager.min.css?ver=1782231295 — 200 — 1.1 KiB — 73 ms — h2https://improvingliteracy.org/wp-content/uploads/2025/11/ncil-book-square-300x300.png/wp-content/uploads/2025/11/ncil-bo... https://improvingliteracy.org/wp-content/uploads/2025/11/ncil-book-square-300x300.png — 200 — 4.5 KiB — 45 ms — h2https://improvingliteracy.org/wp-content/uploads/2025/07/literacy-coaching-at-home-768x432.avif/wp-content/uploads/2025/07/literac... https://improvingliteracy.org/wp-content/uploads/2025/07/literacy-coaching-at-home-768x432.avif — 200 — 44.7 KiB — 50 ms — h2https://improvingliteracy.org/wp-content/uploads/2026/04/Neurological-Considerations-for-Dyslexia-768x432.jpg/wp-content/uploads/2026/04/Neurolo... https://improvingliteracy.org/wp-content/uploads/2026/04/Neurological-Considerations-for-Dyslexia-768x432.jpg — 200 — 47.8 KiB — 70 ms — h2https://improvingliteracy.org/wp-content/uploads/2025/11/ncil-kids-reading-a-book-together-768x432.png/wp-content/uploads/2025/11/ncil-ki... https://improvingliteracy.org/wp-content/uploads/2025/11/ncil-kids-reading-a-book-together-768x432.png — 200 — 113.6 KiB — 355 ms — h3https://improvingliteracy.org/wp-content/uploads/2025/11/ncil-mom-reading-768x432.png/wp-content/uploads/2025/11/ncil-mo... https://improvingliteracy.org/wp-content/uploads/2025/11/ncil-mom-reading-768x432.png — 200 — 71.4 KiB — 330 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
61% of JavaScript execution is third-party
First-party Third-party 1742ms · 362KB · $23/mo
www.gstatic.com
Other
Costly
Execution 1142ms
Transfer 0 KB
Unused 45%
Monthly Cost $15/mo
Google Tag Manager
Tag Manager
Costly
Execution 265ms
Transfer 158 KB
Unused 42%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Optional
Execution 157ms
Transfer 139 KB
Unused 48%
Monthly Cost $2/mo
static.ctctcdn.com
Other
Optional
Execution 125ms
Transfer 37 KB
Unused 93%
Monthly Cost $2/mo
cdnjs
CDN
Optional
Execution 54ms
Transfer 27 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.gstatic.com adds 1142ms and costs ~$15/month
  • Google Tag Manager adds 265ms and costs ~$4/month

61% 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

www.gstatic.com takes 1142ms 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

Google Tag Manager takes 265ms 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

93% of static.ctctcdn.com'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

Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-05-26 — 2026-06-22)

LCP (p75)

1308 ms

95% good

INP (p75)

42 ms

98% good

CLS (p75)

0.010

90% good

FCP (p75)

1091 ms

TTFB (p75)

750 ms

This origin passes Core Web Vitals assessment
Image Optimization
16 images, 222 KB total, 1 KB wasted
INFO

Image Optimization Audit

Total Images

16

Total Size

222 KB

Oversized

1

Wasted

1 KB

12 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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