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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
4
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
41
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
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.

723 ms

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

5.14 s

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

794 ms

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

0.049

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

3.59 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.

5.17 s

Page Load Progression

563 ms
1.1 s
1.7 s
2.3 s
2.8 s
3.4 s
3.9 s
4.5 s
Checks
14
5 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
3.7 MB transferred, 173 requests
FIX
3.7 MB transferred, 173 requests
Warning::
Page weighs 9.8 MB (3.7 MB transferred)
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
Warning::
Images are 1.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.1 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::
173 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.77 g CO2 per page load
3.7 MB / 2.4 MB budget
3.7 MB transferred
173 requests
0.77 g CO2 per page load
JavaScript 2.0 MiB 53%
Images 1.1 MiB 29%
Fonts 234.4 KiB 6%
Other 216.1 KiB 6%
HTML 117.4 KiB 3%
CSS 66.2 KiB 2%
Other 16.1 KiB 0%
Other 7.6 KiB 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

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

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

F
JS Execution Cost
Action
4279ms total JS execution
FIX
4279ms total JS execution
Warning::
https://www.marriott.com/resources/4f96b7c830406f9...: 1907ms CPU time
Warning::
Unattributable: 459ms CPU time
Warning::
https://www.marriott.com/default.mi: 320ms CPU time
Warning::
https://www.marriott.com/mi-assets/mi-static/mi-ho...: 286ms CPU time
Warning::
https://www.marriott.com/MjcD6Bm1EKlUZ1XHh9XfGQWK/...: 275ms CPU time
Info::
Third-party scripts: 858ms (20% of total)

Main Thread Breakdown

Script Evaluation 68% Other 14% Style & Layout 8% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://www.marriott.com/resources/4f96b7c830406f938b23f5e9f0ee55b0f0aafa2feb0451907ms1652ms7ms1st
Unattributable459ms61ms0ms3rd
https://www.marriott.com/default.mi320ms4ms0ms1st
https://www.marriott.com/mi-assets/mi-static/mi-homepage-renderer/web-rel-26.3.2-03232026/_next/static/chunks/pages/_app-5d3573caf6c31bc7.js286ms249ms36ms1st
https://www.marriott.com/MjcD6Bm1EKlUZ1XHh9XfGQWK/b1cuJNX1L5t1cL/Fht-GR0iXgM/XT/10Uxo_GQAC275ms239ms17ms1st
https://js-cdn.dynatrace.com/jstag/1773f6577b3/bf88204ffh/220110cf75551a30_complete.js230ms192ms11ms3rd
https://www.marriott.com/mi-assets/mi-static/mi-homepage-renderer/web-rel-26.3.2-03232026/_next/static/chunks/vendor-2e92c4c9a30f862a.js211ms23ms76ms1st
https://www.marriott.com/MjcD6Bm1EKlUZ1XHh9XfGQWK/hmcuJNX1/ZRwGGh0iXgM/ex/NKO0Z6SQ1u?v=e5e4435d-eab3-c48f-b07a-a5e031f45435200ms173ms13ms1st
https://assets.adobedtm.com/697d0c070f1e/f8138fa40779/launch-fccab51974bf.min.js168ms134ms17ms3rd
https://www.marriott.com/mi-assets/mi-static/mi-homepage-renderer/web-rel-26.3.2-03232026/_next/static/chunks/framework-4d641e3b1d0b3068.js154ms118ms3ms1st

Showing top 10 of 11 scripts

F
JS Bundles
Action
61 scripts, 776 KB unused
FIX
61 scripts, 776 KB unused
Warning::
https://www.marriott.com/mi-assets/mi-static/mi-ho...: 375 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.marriott.com/mi-assets/mi-static/mi-ho...: 105 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js-cdn.dynatrace.com/jstag/1773f6577b3/bf8...: 71 KB unused (45%)
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: 776 KB
776 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 KB375 KB (64%)✓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 (36%)✓1st
https://js-cdn.dynatrace.com/jstag/1773f6577b3/bf88204ffh/220110cf75551a30_complete.js158 KB71 KB (45%)✓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=e5e4435d-eab3-c48f-b07a-a5e031f45435149 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
B
Third-Party Impact
48% third-party, 0 ms blocking
REVIEW
48% third-party, 0 ms blocking
Info::
Third-party code accounts for 48% of page weight (1.8 MiB of 3.7 MiB)
Info::
Third-party blocking time is low (0 ms)
52%
48%
First-party Third-party
C
Image Optimization
Action
31 images, 0 KB saveable
REVIEW
31 images, 0 KB saveable
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.
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.
31 images 1.1 MB
0 oversized -0 KB
18 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 723 ms LCP 5.1 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
173 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
20% of JavaScript execution is third-party
First-party Third-party 858ms · 293KB · $11/mo
Unattributable
Other
Costly
Execution 459ms
Transfer 0 KB
Monthly Cost $6/mo
js-cdn.dynatrace.com
Other
Costly
Execution 230ms
Transfer 158 KB
Unused 45%
Monthly Cost $3/mo
assets.adobedtm.com
Other
Optional
Execution 168ms
Transfer 135 KB
Unused 30%
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • Unattributable adds 459ms and costs ~$6/month
  • js-cdn.dynatrace.com adds 230ms and costs ~$3/month

Unattributable takes 459ms 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 230ms 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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