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https://vitalitydentistry.com

Performance

· 28 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
1
REVIEW
8
PASS
14
INFO
5

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

Mobile Desktop
96
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
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.
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.

1.57 s

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

2.03 s

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

192 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.

2.12 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.

7.97 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
28
14 PASS 8 REVIEW 1 FIX
F
Page Weight Budget
Action
4.7 MB transferred, 36 requests
FIX
4.7 MB transferred, 36 requests
Critical::
Page weighs 5.9 MB (4.7 MB transferred)
Warning::
Images are 1.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.7 MB
Warning::
JavaScript is 530 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 530 KB
Info::
36 HTTP requests
Info::
Estimated 0.98 g CO2 per page load
4.7 MB / 2.4 MB budget
4.7 MB transferred
36 requests
0.98 g CO2 per page load
Other 2.3 MiB 49%
Images 1.7 MiB 36%
JavaScript 530.5 KiB 11%
Other 88.5 KiB 2%
Fonts 73.7 KiB 2%
HTML 16.9 KiB 0%
CSS 14.8 KiB 0%
Other 11.0 KiB 0%
Other 562 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

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

B
Image Optimization
8 images, 0 KB saveable
REVIEW
8 images, 0 KB saveable
Info::
All images are well-optimized
8 images 1.7 MB
0 oversized -0 KB
8 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1274ms total JS execution
REVIEW
1274ms total JS execution
Warning::
https://www.googletagmanager.com/gtag/js?id=G-R22L...: 401ms CPU time
Warning::
Unattributable: 356ms CPU time
Warning::
https://vitalitydentistry.com/: 299ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-N3N...: 151ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-R22L...: 67ms CPU time
Info::
Third-party scripts: 618ms (49% of total)

Main Thread Breakdown

Script Evaluation 41% Other 31% Style & Layout 12% Script Parsing & Compilation 11% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtag/js?id=G-R22LR0L6W2401ms346ms50ms3rd
Unattributable356ms16ms0ms1st
https://vitalitydentistry.com/299ms27ms3ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-N3NVVSVB151ms93ms56ms3rd
https://www.googletagmanager.com/gtag/js?id=G-R22LR0L6W2&cx=c&gtm=4e6bb0h267ms25ms42ms3rd
C
JS Bundles
Action
11 scripts, 265 KB unused
REVIEW
11 scripts, 265 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-R22L...: 130 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-N3N...: 72 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-R22L...: 63 KB unused (32%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 265 KB
265 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-R22LR0L6W2&cx=c&gtm=4e6bb0h2196 KB130 KB (67%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-N3NVVSVB117 KB72 KB (62%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-R22LR0L6W2195 KB63 KB (32%)✓3rd
https://vitalitydentistry.com/airo-video-slots.js4 KB—✓1st
https://vitalitydentistry.com/airo-logo-orientation.js2 KB—✓1st
https://vitalitydentistry.com/analytics.js?v=52 KB—✓1st
https://vitalitydentistry.com/floating-cta.js1 KB—✓1st
https://vitalitydentistry.com/cookie-consent.js?v=23 KB—✓1st
https://vitalitydentistry.com/search.js6 KB—✓1st
https://plausible.io/js/script.js2 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

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
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
36 resources · 4.7 MB · 265 KB savings available
REVIEW
36 resources · 4.7 MB · 265 KB savings available
Warning::
Page weight 4.7 MB exceeds 1 MB target by 3.7 MB
Got: 4.7 MB Expected: ≤ 1 MB
Info::
~265 KB of savings available
Info::
12 third-party resources (11% of weight)
Info::
5 resources over 200KB
36 resources · 4.7 MiB · 12 third-party 3.7 MiB over 1MB target
Media 49% · 2.3 MiB
Image 38% · 1.8 MiB
JavaScript 11% · 530.5 KiB
Font 2% · 73.7 KiB
Document 0% · 17.2 KiB
CSS 0% · 14.8 KiB
Other 0% · 11.5 KiB

~265.1 KiB of savings available

Remove unused JavaScript: 265.1 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
public, max-age=0, must-revalidate
REVIEW
public, max-age=0, must-revalidate
Info::
Cache-Control header is set
Got: public, max-age=0, must-revalidate
Info::
Last-Modified header present
Cache-Control

public, max-age=0, must-revalidate

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
A+
Third-Party Impact
11% third-party, 0 ms blocking
PASS
11% third-party, 0 ms blocking
Info::
Third-party code accounts for 11% of page weight (514.2 KiB of 4.7 MiB)
Info::
Third-party blocking time is low (0 ms)
89%
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 (74 KB)
PASS
2 fonts (74 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

74 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 500 ms 1.0 s 1.5 s 2.0 s FCP 1.6 s LCP 2.0 shttps://vitalitydentistry.com/assets/fonts/dm-sans-latin.woff2dm-sans-latin.woff2 https://vitalitydentistry.com/assets/fonts/dm-sans-latin.woff2 — 36.5 KiB — 237 ms — font-display: swaphttps://vitalitydentistry.com/assets/fonts/cormorant-garamond-latin.woff2cormorant-garamond-lati... https://vitalitydentistry.com/assets/fonts/cormorant-garamond-latin.woff2 — 37.3 KiB — 239 ms — font-display: swap
dm-sans-latin.woff2 woff2 swap
Size 36 KB
Load time 237 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
cormorant-garamond-lati... woff2 swap
Size 37 KB
Load time 239 ms
Start 1.8 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)
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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
—
preload
3
dns-prefetch
—
prefetch
—

3 resource hints configured

A+
Document Compression
Document response uses brotli
PASS
Document 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, must-revalidate
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::
3 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
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
Asset Compression
No text asset hosts to measure
INFO
No text asset hosts to measure
Info::
No third-party or subdomain host served enough text assets to measure
Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.
Network Waterfall
36 requests over 2937ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.6 s LCP 2.0 shttps://vitalitydentistry.com// https://vitalitydentistry.com/ — 200 — 5.0 KiB — 490 ms — h2https://vitalitydentistry.com/z0f76a1d14fd21a8fb5fd0d03e0fdc3d3cedae52f?wsidchk=10317158&pdata=https%253A%252F%252Fvitalitydentistry.com&id=7fa3b767c460b54a2be4d49030b349c7&ts=1794454077&cttl=0/z0f76a1d14fd21a8fb5fd0d03e0fdc3d3c... https://vitalitydentistry.com/z0f76a1d14fd21a8fb5fd0d03e0fdc3d3cedae52f?wsidchk=10317158&pdata=https%253A%252F%252Fvitalitydentistry.com&id=7fa3b767c460b54a2be4d49030b349c7&ts=1794454077&cttl=0 — 302 — 208 B — 118 ms — h2https://vitalitydentistry.com// https://vitalitydentistry.com/ — 200 — 12.0 KiB — 135 ms — h2https://vitalitydentistry.com/airo-video-slots.js/airo-video-slots.js https://vitalitydentistry.com/airo-video-slots.js — 200 — 4.2 KiB — 239 ms — h2https://vitalitydentistry.com/airo-logo-orientation.js/airo-logo-orientation.js https://vitalitydentistry.com/airo-logo-orientation.js — 200 — 2.4 KiB — 343 ms — h2https://vitalitydentistry.com/assets/fonts/dm-sans-latin.woff2/assets/fonts/dm-sans-latin.woff2 https://vitalitydentistry.com/assets/fonts/dm-sans-latin.woff2 — 200 — 36.5 KiB — 237 ms — h2https://vitalitydentistry.com/assets/fonts/cormorant-garamond-latin.woff2/assets/fonts/cormorant-garamond-la... https://vitalitydentistry.com/assets/fonts/cormorant-garamond-latin.woff2 — 200 — 37.3 KiB — 239 ms — h2https://vitalitydentistry.com/assets/fonts.css/assets/fonts.css https://vitalitydentistry.com/assets/fonts.css — 200 — 1.1 KiB — 346 ms — h2https://vitalitydentistry.com/assets/index-DfKeuGoL.css?v=3/assets/index-DfKeuGoL.css?v=3 https://vitalitydentistry.com/assets/index-DfKeuGoL.css?v=3 — 200 — 13.7 KiB — 344 ms — h2https://vitalitydentistry.com/airo-assets/images/logo/horizontal-transparent.png/airo-assets/images/logo/horizontal... https://vitalitydentistry.com/airo-assets/images/logo/horizontal-transparent.png — 200 — 100.1 KiB — 447 ms — h2https://vitalitydentistry.com/airo-assets/images/logo/horizontal-dark-transparent.png/airo-assets/images/logo/horizontal... https://vitalitydentistry.com/airo-assets/images/logo/horizontal-dark-transparent.png — 200 — 115.6 KiB — 449 ms — h2https://vitalitydentistry.com/analytics.js?v=5/analytics.js?v=5 https://vitalitydentistry.com/analytics.js?v=5 — 200 — 1.9 KiB — 449 ms — h2https://vitalitydentistry.com/airo-media.json/airo-media.json https://vitalitydentistry.com/airo-media.json — 200 — 9.8 KiB — 208 ms — h2https://vitalitydentistry.com/airo-media.json/airo-media.json https://vitalitydentistry.com/airo-media.json — 200 — 0 B — 104 ms — h2https://vitalitydentistry.com/floating-cta.js/floating-cta.js https://vitalitydentistry.com/floating-cta.js — 200 — 1.2 KiB — 133 ms — h2https://vitalitydentistry.com/cookie-consent.js?v=2/cookie-consent.js?v=2 https://vitalitydentistry.com/cookie-consent.js?v=2 — 200 — 2.7 KiB — 240 ms — h2https://vitalitydentistry.com/search.js/search.js https://vitalitydentistry.com/search.js — 200 — 5.6 KiB — 134 ms — h2https://vitalitydentistry.com/airo-assets/videos/pages/home/hero-video.mp4/airo-assets/videos/pages/home/hero... https://vitalitydentistry.com/airo-assets/videos/pages/home/hero-video.mp4 — 206 — 2.3 MiB — 434 ms — h2https://vitalitydentistry.com/airo-assets/images/pages/home/implant-card.jpg/airo-assets/images/pages/home/impl... https://vitalitydentistry.com/airo-assets/images/pages/home/implant-card.jpg — 200 — 256.3 KiB — 413 ms — h2https://vitalitydentistry.com/airo-assets/images/pages/home/cosmetic-card.jpg/airo-assets/images/pages/home/cosm... https://vitalitydentistry.com/airo-assets/images/pages/home/cosmetic-card.jpg — 200 — 365.8 KiB — 419 ms — h2https://vitalitydentistry.com/airo-assets/images/pages/home/family-card.jpg/airo-assets/images/pages/home/fami... https://vitalitydentistry.com/airo-assets/images/pages/home/family-card.jpg — 200 — 315.2 KiB — 481 ms — h2https://vitalitydentistry.com/airo-assets/images/pages/home/office-interior.jpg/airo-assets/images/pages/home/offi... https://vitalitydentistry.com/airo-assets/images/pages/home/office-interior.jpg — 200 — 382.7 KiB — 489 ms — h2https://vitalitydentistry.com/media/pages/dental-implant-seminar/seminar-audience-implant-presentation.jpg/media/pages/dental-implant-seminar... https://vitalitydentistry.com/media/pages/dental-implant-seminar/seminar-audience-implant-presentation.jpg — 200 — 186.6 KiB — 493 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-N3NVVSVBwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-N3NVVSVB — 200 — 116.6 KiB — 175 ms — h2https://www.googletagmanager.com/gtag/js?id=G-R22LR0L6W2www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-R22LR0L6W2 — 200 — 195.5 KiB — 206 ms — h2https://plausible.io/js/script.jsplausible.io/js/script.js https://plausible.io/js/script.js — 200 — 1.9 KiB — 114 ms — h2https://plausible.io/api/eventplausible.io/api/event https://plausible.io/api/event — 202 — 521 B — 98 ms — h2https://www.googletagmanager.com/gtag/js?id=G-R22LR0L6W2&cx=c&gtm=4e6bb0h2www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-R22LR0L6W2&cx=c&gtm=4e6bb0h2 — 200 — 195.5 KiB — 83 ms — h2https://analytics.google.com/g/collect?v=2&tid=G-R22LR0L6W2&gtm=45je6ba1v9265598231za208zb9265790668zd9265790668xf1&_p=1794454079711&_gaz=1&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAAAACAC&cid=1750920939.1794454080&frm=0&ibt=1&ngs=1&pscdl=noapi&rcb=9&sr=412x823&uaa=&uab=64&uafvl=Not%253AA-Brand%3B8.0.0.0%7CChromium%3B156.0.8078.79&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=115938466~115938469~118897920~118897930~120213116~120385422~120412526~120420414~120469145~120469153~121246026~121246034~123329125~123785233~124170881&sid=1794454080&sct=1&seg=0&dl=https%3A%2F%2Fvitalitydentistry.com%2F&dr=https%3A%2F%2Fvitalitydentistry.com%2F&dt=Dentistry%20at%20Vitality%20Health%20%7C%20Markham%20Dentist%20Since%201985&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=1037analytics.google.com/g/collect?v=2&... https://analytics.google.com/g/collect?v=2&tid=G-R22LR0L6W2&gtm=45je6ba1v9265598231za208zb9265790668zd9265790668xf1&_p=1794454079711&_gaz=1&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAAAACAC&cid=1750920939.1794454080&frm=0&ibt=1&ngs=1&pscdl=noapi&rcb=9&sr=412x823&uaa=&uab=64&uafvl=Not%253AA-Brand%3B8.0.0.0%7CChromium%3B156.0.8078.79&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=115938466~115938469~118897920~118897930~120213116~120385422~120412526~120420414~120469145~120469153~121246026~121246034~123329125~123785233~124170881&sid=1794454080&sct=1&seg=0&dl=https%3A%2F%2Fvitalitydentistry.com%2F&dr=https%3A%2F%2Fvitalitydentistry.com%2F&dt=Dentistry%20at%20Vitality%20Health%20%7C%20Markham%20Dentist%20Since%201985&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=1037 — 204 — 552 B — 98 ms — 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0 ms 1.0 s 2.0 s 3.0 s FCP 1.6 s LCP 2.0 shttps://vitalitydentistry.com// https://vitalitydentistry.com/ — 200 — 5.0 KiB — 490 ms — h2https://vitalitydentistry.com/z0f76a1d14fd21a8fb5fd0d03e0fdc3d3cedae52f?wsidchk=10317158&pdata=https%253A%252F%252Fvitalitydentistry.com&id=7fa3b767c460b54a2be4d49030b349c7&ts=1794454077&cttl=0/z0f76a1d14fd21a8fb5fd0d03e0fdc3d3c... https://vitalitydentistry.com/z0f76a1d14fd21a8fb5fd0d03e0fdc3d3cedae52f?wsidchk=10317158&pdata=https%253A%252F%252Fvitalitydentistry.com&id=7fa3b767c460b54a2be4d49030b349c7&ts=1794454077&cttl=0 — 302 — 208 B — 118 ms — h2https://vitalitydentistry.com// https://vitalitydentistry.com/ — 200 — 12.0 KiB — 135 ms — h2https://vitalitydentistry.com/airo-video-slots.js/airo-video-slots.js https://vitalitydentistry.com/airo-video-slots.js — 200 — 4.2 KiB — 239 ms — h2https://vitalitydentistry.com/airo-logo-orientation.js/airo-logo-orientation.js https://vitalitydentistry.com/airo-logo-orientation.js — 200 — 2.4 KiB — 343 ms — 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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 618ms · 508KB · $8/mo
Google Tag Manager
Tag Manager
Costly
Execution 401ms
Transfer 195 KB
Unused 32%
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Optional
Execution 151ms
Transfer 117 KB
Unused 62%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 67ms
Transfer 196 KB
Unused 67%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 401ms and costs ~$5/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 401ms 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

67% 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

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 (2026-10-13 — 2026-11-09)

LCP (p75)

922 ms

97% good

INP (p75)

54 ms

98% good

CLS (p75)

0.000

98% good

FCP (p75)

872 ms

TTFB (p75)

368 ms

This origin passes Core Web Vitals assessment
Image Optimization
7 images, 1532 KB total, 1421 KB wasted
INFO

Image Optimization Audit

Total Images

7

Total Size

1532 KB

Oversized

6

Wasted

1421 KB

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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