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Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
4
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
33
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.
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.

4.61 s

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

17.67 s

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

1.45 s

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

0.066

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

7.79 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.

19.11 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
16
8 PASS 2 REVIEW 4 FIX
F
Page Weight Budget
Action
14.4 MB transferred, 153 requests
FIX
14.4 MB transferred, 153 requests
Critical::
Page weighs 19.9 MB (14.4 MB transferred)
Warning::
Images are 12.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 12.5 MB
Warning::
JavaScript is 1.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.5 MB
Warning::
153 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 3.0 g CO2 per page load
14.4 MB / 2.4 MB budget
14.4 MB transferred
153 requests
3.0 g CO2 per page load
Images 12.5 MiB 87%
JavaScript 1.5 MiB 11%
Fonts 116.8 KiB 1%
HTML 81.5 KiB 1%
Other 52.7 KiB 0%
Other 33.8 KiB 0%
CSS 32.4 KiB 0%
Other 2.0 KiB 0%
Other 0 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

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
92% third-party, 0 ms blocking
FIX
92% third-party, 0 ms blocking
Warning::
Third-party code accounts for 92% of page weight (13.2 MiB of 14.4 MiB)
Info::
Third-party blocking time is low (0 ms)
92%
First-party Third-party
F
JS Execution Cost
Action
6852ms total JS execution
FIX
6852ms total JS execution
Warning::
https://www.nfl.com/_next/static/chunks/2303-8cdf0...: 2834ms CPU time
Warning::
Unattributable: 1241ms CPU time
Warning::
https://www.nfl.com/international: 1090ms CPU time
Warning::
https://www.nfl.com/_next/static/chunks/app/%5B%5B...: 690ms CPU time
Warning::
https://assets.adobedtm.com/a5ea4e8f4344/1648c62d3...: 460ms CPU time
Info::
Third-party scripts: 1701ms (25% of total)

Main Thread Breakdown

Script Evaluation 58% Other 17% Style & Layout 10% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
https://www.nfl.com/_next/static/chunks/2303-8cdf0ff225e90745.js2834ms2523ms56ms1st
Unattributable1241ms222ms0ms3rd
https://www.nfl.com/international1090ms70ms135ms1st
https://www.nfl.com/_next/static/chunks/app/%5B%5B...pages%5D%5D/page-ab1c0860b0e4ea47.js690ms478ms108ms1st
https://assets.adobedtm.com/a5ea4e8f4344/1648c62d3986/launch-53368d199d70.min.js460ms394ms45ms3rd
https://www.nfl.com/_next/static/chunks/87c73c54-0df74f0fec58f23d.js379ms323ms27ms1st
https://www.nfl.com/_next/static/chunks/7790-bf9dbed8489e6381.js96ms21ms53ms1st
https://www.nfl.com/_next/static/chunks/9694-2f67674d67e3d317.js63ms1ms61ms1st
F
JS Bundles
Action
39 scripts, 556 KB unused
FIX
39 scripts, 556 KB unused
Warning::
https://www.nfl.com/_next/static/chunks/app/%5B%5B...: 203 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.nfl.com/_next/static/chunks/7790-bf9db...: 86 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.nfl.com/_next/static/chunks/2303-8cdf0...: 75 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.nfl.com/_next/static/chunks/9694-2f676...: 73 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.nfl.com/_next/static/chunks/4713-a73be...: 39 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 556 KB
556 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.nfl.com/_next/static/chunks/app/%5B%5B...pages%5D%5D/page-ab1c0860b0e4ea47.js266 KB203 KB (77%)✓1st
https://www.nfl.com/_next/static/chunks/7790-bf9dbed8489e6381.js165 KB86 KB (52%)✓1st
https://www.nfl.com/_next/static/chunks/2303-8cdf0ff225e90745.js125 KB75 KB (60%)✓1st
https://www.nfl.com/_next/static/chunks/9694-2f67674d67e3d317.js149 KB73 KB (51%)✓1st
https://www.nfl.com/_next/static/chunks/4713-a73be4f31951b1e3.js74 KB39 KB (53%)✓1st
https://www.nfl.com/_next/static/chunks/59c6eb5a-c1c5310ffc228231.js35 KB33 KB (94%)✓1st
https://assets.adobedtm.com/a5ea4e8f4344/1648c62d3986/launch-53368d199d70.min.js108 KB24 KB (23%)✓3rd
https://www.nfl.com/_next/static/chunks/7444-9a3ed02348f628a9.js45 KB23 KB (51%)✓1st
https://p.nfltags.com/nfl/live/NflUmdComponents.NFLToken.js115 KB—✓3rd
https://imasdk.googleapis.com/js/sdkloader/gpt_proxy.js38 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

C
Image Optimization
Action
56 images, 0 KB saveable
REVIEW
56 images, 0 KB saveable
Warning::
https://static.www.nfl.com/image/upload/q_auto,f_a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.www.nfl.com/image/upload/q_auto,f_a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.www.nfl.com/image/upload/q_auto,f_a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.www.nfl.com/image/upload/q_auto,f_a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.www.nfl.com/image/upload/q_auto,f_a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.www.nfl.com/image/upload/q_auto,f_a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.www.nfl.com/image/upload/q_auto,f_a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.www.nfl.com/image/upload/q_auto,f_a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
56 images 12.5 MB
0 oversized -0 KB
12 legacy format
8 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

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 (117 KB)
PASS
6 fonts (117 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

117 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 FCP 4.6 s LCP 17.7 shttps://www.nfl.com/_next/static/media/20c0559eefdcb152-s.p.woff220c0559eefdcb152-s.p.woff2 https://www.nfl.com/_next/static/media/20c0559eefdcb152-s.p.woff2 — 18.8 KiB — 0 ms — font-display: swaphttps://www.nfl.com/_next/static/media/3d4be123d24d6f26-s.p.woff23d4be123d24d6f26-s.p.woff2 https://www.nfl.com/_next/static/media/3d4be123d24d6f26-s.p.woff2 — 18.7 KiB — 0 ms — font-display: swaphttps://www.nfl.com/_next/static/media/7f9531cb3807ad59-s.p.woff27f9531cb3807ad59-s.p.woff2 https://www.nfl.com/_next/static/media/7f9531cb3807ad59-s.p.woff2 — 17.8 KiB — 0 ms — font-display: swaphttps://www.nfl.com/_next/static/media/88fa3b7d776b088c-s.p.woff288fa3b7d776b088c-s.p.woff2 https://www.nfl.com/_next/static/media/88fa3b7d776b088c-s.p.woff2 — 18.3 KiB — 0 ms — font-display: swaphttps://www.nfl.com/_next/static/media/ba4d528d74f0b293-s.p.woff2ba4d528d74f0b293-s.p.woff2 https://www.nfl.com/_next/static/media/ba4d528d74f0b293-s.p.woff2 — 24.3 KiB — 0 ms — font-display: swaphttps://www.nfl.com/_next/static/media/d39a798ee3c498d6-s.p.woff2d39a798ee3c498d6-s.p.woff2 https://www.nfl.com/_next/static/media/d39a798ee3c498d6-s.p.woff2 — 18.9 KiB — 0 ms — font-display: swap
20c0559eefdcb152-s.p.woff2 woff2 swap
Size 19 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
3d4be123d24d6f26-s.p.woff2 woff2 swap
Size 19 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
7f9531cb3807ad59-s.p.woff2 woff2 swap
Size 18 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
88fa3b7d776b088c-s.p.woff2 woff2 swap
Size 18 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
ba4d528d74f0b293-s.p.woff2 woff2 swap
Size 24 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
d39a798ee3c498d6-s.p.woff2 woff2 swap
Size 19 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
30 hints, 0 missing preconnects
PASS
30 hints, 0 missing preconnects
Info::
Page uses 30 resource hint(s)

Current Resource Hints

preconnect
3
preload
+17
27
dns-prefetch
—
prefetch
—

30 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
A
HTTP Caching
max-age=5 (5 seconds)
PASS
max-age=5 (5 seconds)
Info::
Cache-Control header is set
Got: public, max-age=5
Info::
Effective TTL: 5 seconds (max-age=5)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=5

DirectiveValueMeaning
public—Any cache may store this response
max-age5Cache for 5 seconds
Effective TTL: 5 seconds
Network Waterfall
153 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
25% of JavaScript execution is third-party
First-party Third-party 1701ms · 108KB · €18/mo
Unattributable
Other
Costly
Execution 1241ms
Transfer 0 KB
Monthly Cost €13/mo
assets.adobedtm.com
Other
Costly
Execution 460ms
Transfer 108 KB
Unused 23%
Monthly Cost €5/mo

These scripts may cost more than they're worth

  • Unattributable adds 1241ms and costs ~€13/month
  • assets.adobedtm.com adds 460ms and costs ~€5/month

Unattributable takes 1241ms 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 460ms 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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