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Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
5
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
24
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.
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.

3.61 s

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

23.82 s

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

3.19 s

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

0.144

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

11.89 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.

24.37 s

Page Load Progression

502 ms
1.0 s
1.5 s
2.0 s
2.5 s
3.0 s
3.5 s
4.0 s
Checks
16
7 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
6.2 MB transferred, 154 requests
FIX
6.2 MB transferred, 154 requests
Critical::
Page weighs 12.3 MB (6.2 MB transferred)
Warning::
Images are 3.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.6 MB
Warning::
JavaScript is 2.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.0 MB
Info::
Fonts are 234 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 234 KB
Warning::
154 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.3 g CO2 per page load
6.2 MB / 2.4 MB budget
6.2 MB transferred
154 requests
1.3 g CO2 per page load
Images 3.6 MiB 58%
JavaScript 2.0 MiB 32%
Fonts 234.4 KiB 4%
Other 213.8 KiB 3%
HTML 116.6 KiB 2%
CSS 66.2 KiB 1%
Other 16.1 KiB 0%
Other 6.8 KiB 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

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
69% third-party, 0 ms blocking
FIX
69% third-party, 0 ms blocking
Warning::
Third-party code accounts for 69% of page weight (4.3 MiB of 6.2 MiB)
Info::
Third-party blocking time is low (0 ms)
31%
69%
First-party Third-party
F
JS Execution Cost
Action
15338ms total JS execution
FIX
15338ms total JS execution
Warning::
https://www.marriott.com/resources/4f96b7c830406f9...: 5003ms CPU time
Warning::
Unattributable: 1837ms CPU time
Warning::
https://js-cdn.dynatrace.com/jstag/1773f6577b3/bf8...: 1357ms CPU time
Warning::
https://www.marriott.com/MjcD6Bm1EKlUZ1XHh9XfGQWK/...: 1233ms CPU time
Warning::
https://www.marriott.com/mi-assets/mi-static/mi-ho...: 1052ms CPU time
Info::
Third-party scripts: 4617ms (30% of total)

Main Thread Breakdown

Script Evaluation 64% Other 17% Style & Layout 7% Script Parsing & Compilation 5% Garbage Collection 3%
ScriptTotalScriptingParse/CompileParty
https://www.marriott.com/resources/4f96b7c830406f938b23f5e9f0ee55b0f0aafa2feb0455003ms4306ms46ms1st
Unattributable1837ms262ms0ms3rd
https://js-cdn.dynatrace.com/jstag/1773f6577b3/bf88204ffh/220110cf75551a30_complete.js1357ms1154ms35ms3rd
https://www.marriott.com/MjcD6Bm1EKlUZ1XHh9XfGQWK/b1cuJNX1L5t1cL/Fht-GR0iXgM/XT/10Uxo_GQAC1233ms882ms57ms1st
https://www.marriott.com/mi-assets/mi-static/mi-homepage-renderer/web-rel-26.3.2-03232026/_next/static/chunks/framework-4d641e3b1d0b3068.js1052ms305ms16ms1st
https://www.marriott.com/default.mi1022ms14ms3ms1st
https://www.marriott.com/mi-assets/mi-static/mi-homepage-renderer/web-rel-26.3.2-03232026/_next/static/chunks/pages/_app-5d3573caf6c31bc7.js967ms848ms113ms1st
https://www.marriott.com/MjcD6Bm1EKlUZ1XHh9XfGQWK/hmcuJNX1/ZRwGGh0iXgM/ex/NKO0Z6SQ1u?v=cd76aaa6-58f5-30ce-db32-7f59c12b5435697ms618ms48ms1st
https://assets.adobedtm.com/697d0c070f1e/f8138fa40779/launch-fccab51974bf.min.js603ms464ms78ms3rd
https://www.marriott.com/mi-assets/mi-static/mi-homepage-renderer/web-rel-26.3.2-03232026/_next/static/chunks/vendor-2e92c4c9a30f862a.js352ms44ms201ms1st

Showing top 10 of 20 scripts

F
JS Bundles
Action
60 scripts, 789 KB unused
FIX
60 scripts, 789 KB unused
Warning::
https://www.marriott.com/mi-assets/mi-static/mi-ho...: 380 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.marriott.com/mi-assets/mi-static/mi-ho...: 105 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js-cdn.dynatrace.com/jstag/1773f6577b3/bf8...: 78 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.marriott.com/mi-assets/mi-static/mi-ho...: 70 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.adobedtm.com/697d0c070f1e/f8138fa40...: 40 KB unused (30%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 789 KB
789 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.marriott.com/mi-assets/mi-static/mi-homepage-renderer/web-rel-26.3.2-03232026/_next/static/chunks/vendor-2e92c4c9a30f862a.js599 KB380 KB (65%)✓1st
https://www.marriott.com/mi-assets/mi-static/mi-homepage-renderer/web-rel-26.3.2-03232026/_next/static/chunks/pages/_app-5d3573caf6c31bc7.js290 KB105 KB (37%)✓1st
https://js-cdn.dynatrace.com/jstag/1773f6577b3/bf88204ffh/220110cf75551a30_complete.js158 KB78 KB (49%)✓3rd
https://www.marriott.com/mi-assets/mi-static/mi-homepage-renderer/web-rel-26.3.2-03232026/_next/static/chunks/69ea16bc-e539cc69ef48e4db.js99 KB70 KB (71%)✓1st
https://assets.adobedtm.com/697d0c070f1e/f8138fa40779/launch-fccab51974bf.min.js135 KB40 KB (30%)✓3rd
https://www.marriott.com/MjcD6Bm1EKlUZ1XHh9XfGQWK/b1cuJNX1L5t1cL/Fht-GR0iXgM/XT/10Uxo_GQAC188 KB39 KB (21%)✓1st
https://www.marriott.com/MjcD6Bm1EKlUZ1XHh9XfGQWK/hmcuJNX1/ZRwGGh0iXgM/ex/NKO0Z6SQ1u?v=cd76aaa6-58f5-30ce-db32-7f59c12b5435149 KB27 KB (18%)✓1st
https://siteintercept.qualtrics.com/dxjsmodule/12.45e656039b3fa23613e1.chunk.js?Q_CLIENTVERSION=2.45.0&Q_CLIENTTYPE=web&Q_BRANDID=www.marriott.com36 KB25 KB (71%)✓3rd
https://www.marriott.com/resources/4f96b7c830406f938b23f5e9f0ee55b0f0aafa2feb04570 KB24 KB (34%)✓1st
https://www.marriott.com/mi-assets/mi-static/mi-homepage-renderer/web-rel-26.3.2-03232026/_next/static/8P0OfYhUPHEYscf6QKiqT/_buildManifest.js1 KB—✓1st

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

D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: max-age=0, no-cache, no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0, no-cache, no-store

DirectiveValueMeaning
max-age0Cache for 0 seconds
no-cache—Cache but always revalidate first
no-store—Never cache this response
C
Image Optimization
Action
23 images, 0 KB saveable
REVIEW
23 images, 0 KB saveable
Warning::
https://cache.marriott.com/is/image/marriotts7prod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cache.marriott.com/is/image/marriotts7prod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cache.marriott.com/is/image/marriotts7prod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cache.marriott.com/is/image/marriotts7prod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cache.marriott.com/is/image/marriotts7prod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cache.marriott.com/is/image/marriotts7prod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cache.marriott.com/is/image/marriotts7prod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cache.marriott.com/is/image/marriotts7prod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cache.marriott.com/aka-fonts/ccpa/privacyo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cache.marriott.com/is/image/marriotts7prod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cache.marriott.com/is/image/marriotts7prod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cache.marriott.com/is/image/marriotts7prod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
23 images 3.6 MB
0 oversized -0 KB
12 legacy format
12 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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
6 fonts (234 KB)
PASS
6 fonts (234 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

234 KB total

Render-blocking

0

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s FCP 3.6 s LCP 23.8 shttps://cache.marriott.com/aka-fonts/MarriottDigital/swiss/Swiss721BT-Regular.woff2Swiss721BT-Regular.woff2 https://cache.marriott.com/aka-fonts/MarriottDigital/swiss/Swiss721BT-Regular.woff2 — 18.9 KiB — 0 ms — font-display: swaphttps://cache.marriott.com/aka-fonts/MarriottDigital/swiss/Swiss721BT-Medium.woff2Swiss721BT-Medium.woff2 https://cache.marriott.com/aka-fonts/MarriottDigital/swiss/Swiss721BT-Medium.woff2 — 18.5 KiB — 0 ms — font-display: swaphttps://cache.marriott.com/aka-fonts/MarriottDigital/swiss/Swiss721BT-Bold.woff2Swiss721BT-Bold.woff2 https://cache.marriott.com/aka-fonts/MarriottDigital/swiss/Swiss721BT-Bold.woff2 — 18.4 KiB — 0 ms — font-display: swaphttps://cache.marriott.com/aka-fonts/mi-icons/mi-icons.woff2mi-icons.woff2 https://cache.marriott.com/aka-fonts/mi-icons/mi-icons.woff2 — 55.0 KiB — 0 ms — font-display: swaphttps://cache.marriott.com/aka-fonts/mi-brand-logo-icons/mi-brand-logo-icons.woff2mi-brand-logo-icons.woff2 https://cache.marriott.com/aka-fonts/mi-brand-logo-icons/mi-brand-logo-icons.woff2 — 68.0 KiB — 0 ms — font-display: swaphttps://cache.marriott.com/aka-fonts/mi-portfolio-logo-icons/mi-portfolio-logo-icons.woff2mi-portfolio-logo-icons... https://cache.marriott.com/aka-fonts/mi-portfolio-logo-icons/mi-portfolio-logo-icons.woff2 — 55.6 KiB — 0 ms — font-display: swap
Swiss721BT-Regular.woff2 woff2 swap
Size 19 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Swiss721BT-Medium.woff2 woff2 swap
Size 18 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Swiss721BT-Bold.woff2 woff2 swap
Size 18 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
mi-icons.woff2 woff2 swap
Size 55 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
mi-brand-logo-icons.woff2 woff2 swap
Size 68 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
mi-portfolio-logo-icons... woff2 swap
Size 56 KB
Load time 0 ms
Start 0 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
18 hints, 0 missing preconnects
PASS
18 hints, 0 missing preconnects
Info::
Page uses 18 resource hint(s)

Current Resource Hints

preconnect
3
preload
+3
13
dns-prefetch
2
prefetch
—

18 resource hints configured

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
Network Waterfall
154 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
30% of JavaScript execution is third-party
First-party Third-party 4617ms · 335KB · $61/mo
Unattributable
Other
Costly
Execution 1837ms
Transfer 0 KB
Monthly Cost $24/mo
js-cdn.dynatrace.com
Other
Costly
Execution 1357ms
Transfer 158 KB
Unused 49%
Monthly Cost $18/mo
assets.adobedtm.com
Other
Costly
Execution 603ms
Transfer 135 KB
Unused 30%
Monthly Cost $8/mo
assets.adobedtm.com
Other
Optional
Execution 164ms
Transfer 1 KB
Monthly Cost $2/mo
assets.adobedtm.com
Other
Optional
Execution 147ms
Transfer 1 KB
Monthly Cost $2/mo
assets.adobedtm.com
Other
Optional
Execution 118ms
Transfer 3 KB
Monthly Cost $2/mo
siteintercept.qualtrics.com
Other
Optional
Execution 116ms
Transfer 19 KB
Monthly Cost $2/mo
assets.adobedtm.com
Other
Optional
Execution 116ms
Transfer 1 KB
Monthly Cost $2/mo
p11.techlab-cdn.com
Other
Optional
Execution 92ms
Transfer 16 KB
Monthly Cost $1/mo
assets.adobedtm.com
Other
Optional
Execution 66ms
Transfer 1 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 1837ms and costs ~$24/month
  • js-cdn.dynatrace.com adds 1357ms and costs ~$18/month
  • assets.adobedtm.com adds 603ms and costs ~$8/month

Unattributable takes 1837ms 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

js-cdn.dynatrace.com takes 1357ms 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

assets.adobedtm.com takes 603ms 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

How third-party costs are calculated

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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