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https://dazn.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
90
GRADE
A
FIX
2
REVIEW
2
PASS
9
INFO
2

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

Mobile Desktop
93
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
86
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.
54
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.

783 ms

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

1.66 s

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

2 ms

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

0.003

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

859 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.66 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
15
9 PASS 2 REVIEW 2 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (1013.0 KiB of 1013.4 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
JS Bundles
2 scripts, 145 KB unused
REVIEW
2 scripts, 145 KB unused
Warning::
https://www.dazn.com/static/boot-29.324.0-fba5a171...: 145 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 145 KB
145 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.dazn.com/static/boot-29.324.0-fba5a171a9c8268be362.js213 KB145 KB (68%)✓3rd
https://js-agent.newrelic.com/nr-spa-1.261.1.min.js31 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

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

Green Hosting

No green hosting detected

A
Page Weight Budget
1013 KB transferred, 28 requests
PASS
1013 KB transferred, 28 requests
Info::
Page weighs 3.6 MB (1013 KB transferred)
Info::
Fonts are 513 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 513 KB
Info::
28 HTTP requests
Info::
Estimated 0.21 g CO2 per page load
1013 KB / 2.4 MB budget
1013 KB transferred
28 requests
0.21 g CO2 per page load
Fonts 513.5 KiB 51%
JavaScript 244.4 KiB 24%
Other 214.1 KiB 21%
HTML 29.3 KiB 3%
CSS 6.5 KiB 1%
Other 3.4 KiB 0%
Other 1.3 KiB 0%
Other 909 B 0%
Images 0 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget

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

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+
Image Optimization
1 images, 0 KB saveable
PASS
1 images, 0 KB saveable
Info::
All images are well-optimized
1 images 0 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
140ms total JS execution
PASS
140ms total JS execution
Info::
Unattributable: 84ms CPU time
Info::
https://www.dazn.com/static/boot-29.324.0-fba5a171...: 56ms CPU time
Warning::
Third-party scripts: 140ms (100% of total)

Main Thread Breakdown

Script Evaluation 44% Other 37% Script Parsing & Compilation 10% Style & Layout 7%
ScriptTotalScriptingParse/CompileParty
Unattributable84ms16ms0ms3rd
https://www.dazn.com/static/boot-29.324.0-fba5a171a9c8268be362.js56ms39ms17ms3rd
A+
Font Loading
10 fonts (513 KB)
PASS
10 fonts (513 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

513 KB total

Render-blocking

0

of 10

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 FCP 783 ms LCP 1.7 shttps://static.dazndn.com/fonts/DAZNTrim_v2.9_normal_400.woff2DAZNTrim_v2.9_normal_40... https://static.dazndn.com/fonts/DAZNTrim_v2.9_normal_400.woff2 — 54.8 KiB — 33 ms — font-display: swaphttps://static.dazndn.com/fonts/DAZNTrim_v2.9_normal_600.woff2DAZNTrim_v2.9_normal_60... https://static.dazndn.com/fonts/DAZNTrim_v2.9_normal_600.woff2 — 55.8 KiB — 36 ms — font-display: swaphttps://static.dazndn.com/fonts/DAZNTrim_v2.9_normal_800.woff2DAZNTrim_v2.9_normal_80... https://static.dazndn.com/fonts/DAZNTrim_v2.9_normal_800.woff2 — 58.5 KiB — 42 ms — font-display: swaphttps://static.dazndn.com/fonts/Oscine_v2.001_normal_400.woff2Oscine_v2.001_normal_40... https://static.dazndn.com/fonts/Oscine_v2.001_normal_400.woff2 — 40.5 KiB — 45 ms — font-display: swaphttps://static.dazndn.com/fonts/DAZNTrim_v2.9_italic_600.woff2DAZNTrim_v2.9_italic_60... https://static.dazndn.com/fonts/DAZNTrim_v2.9_italic_600.woff2 — 56.4 KiB — 49 ms — font-display: swaphttps://static.dazndn.com/fonts/DAZNTrimCondensed_v1.0_normal_400.woff2DAZNTrimCondensed_v1.0_... https://static.dazndn.com/fonts/DAZNTrimCondensed_v1.0_normal_400.woff2 — 24.6 KiB — 51 ms — font-display: swaphttps://static.dazndn.com/fonts/DAZNTrimCondensed_v1.0_normal_700.woff2DAZNTrimCondensed_v1.0_... https://static.dazndn.com/fonts/DAZNTrimCondensed_v1.0_normal_700.woff2 — 25.0 KiB — 53 ms — font-display: swaphttps://static.dazndn.com/fonts/Oscine_v2.001_normal_700.woff2Oscine_v2.001_normal_70... https://static.dazndn.com/fonts/Oscine_v2.001_normal_700.woff2 — 42.0 KiB — 52 ms — font-display: swaphttps://static.dazndn.com/fonts/Oscine_v2.001_normal_800.woff2Oscine_v2.001_normal_80... https://static.dazndn.com/fonts/Oscine_v2.001_normal_800.woff2 — 43.0 KiB — 54 ms — font-display: swaphttps://static.dazndn.com/fonts/Inter-Bold.woff2Inter-Bold.woff2 https://static.dazndn.com/fonts/Inter-Bold.woff2 — 112.9 KiB — 56 ms — font-display: swap
DAZNTrim_v2.9_normal_40... woff2 swap
Size 55 KB
Load time 33 ms
Start 28 ms
Risk FOUT — text flashes from fallback to web font
DAZNTrim_v2.9_normal_60... woff2 swap
Size 56 KB
Load time 36 ms
Start 29 ms
Risk FOUT — text flashes from fallback to web font
DAZNTrim_v2.9_normal_80... woff2 swap
Size 59 KB
Load time 42 ms
Start 29 ms
Risk FOUT — text flashes from fallback to web font
Oscine_v2.001_normal_40... woff2 swap
Size 41 KB
Load time 45 ms
Start 29 ms
Risk FOUT — text flashes from fallback to web font
DAZNTrim_v2.9_italic_60... woff2 swap
Size 56 KB
Load time 49 ms
Start 30 ms
Risk FOUT — text flashes from fallback to web font
DAZNTrimCondensed_v1.0_... woff2 swap
Size 25 KB
Load time 51 ms
Start 30 ms
Risk FOUT — text flashes from fallback to web font
DAZNTrimCondensed_v1.0_... woff2 swap
Size 25 KB
Load time 53 ms
Start 31 ms
Risk FOUT — text flashes from fallback to web font
Oscine_v2.001_normal_70... woff2 swap
Size 42 KB
Load time 52 ms
Start 31 ms
Risk FOUT — text flashes from fallback to web font
Oscine_v2.001_normal_80... woff2 swap
Size 43 KB
Load time 54 ms
Start 31 ms
Risk FOUT — text flashes from fallback to web font
Inter-Bold.woff2 woff2 swap
Size 113 KB
Load time 56 ms
Start 31 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
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 ~56 KB and ~112 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A
Page Weight Inventory
28 resources · 1013 KB · 145 KB savings available
PASS
28 resources · 1013 KB · 145 KB savings available
Info::
Within 1MB page-weight target
Got: 1013 KB
Info::
~145 KB of savings available
Warning::
27 third-party resources (100% of weight)
Info::
2 resources over 200KB
28 resources · 1013.4 KiB · 27 third-party Within 1MB page-weight target
Font 51% · 513.5 KiB
JavaScript 24% · 244.4 KiB
Other 21% · 216.3 KiB
Document 3% · 29.3 KiB
CSS 1% · 6.5 KiB
Image 0% · 3.5 KiB

~144.8 KiB of savings available

Remove unused JavaScript: 144.8 KiB
Network Waterfall
28 requests over 872ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 783 ms LCP 1.7 shttps://dazn.com// https://dazn.com/ — 301 — 345 B — 8 ms — h2https://www.dazn.com/www.dazn.com/ https://www.dazn.com/ — 200 — 29.3 KiB — 12 ms — h2https://static.dazndn.com/fonts/DAZNTrim_v2.9_normal_400.woff2static.dazndn.com/fonts/DAZNTrim_v2... https://static.dazndn.com/fonts/DAZNTrim_v2.9_normal_400.woff2 — 200 — 54.8 KiB — 33 ms — h2https://static.dazndn.com/fonts/DAZNTrim_v2.9_normal_600.woff2static.dazndn.com/fonts/DAZNTrim_v2... https://static.dazndn.com/fonts/DAZNTrim_v2.9_normal_600.woff2 — 200 — 55.8 KiB — 36 ms — h2https://static.dazndn.com/fonts/DAZNTrim_v2.9_normal_800.woff2static.dazndn.com/fonts/DAZNTrim_v2... https://static.dazndn.com/fonts/DAZNTrim_v2.9_normal_800.woff2 — 200 — 58.5 KiB — 42 ms — h2https://static.dazndn.com/fonts/Oscine_v2.001_normal_400.woff2static.dazndn.com/fonts/Oscine_v2.0... https://static.dazndn.com/fonts/Oscine_v2.001_normal_400.woff2 — 200 — 40.5 KiB — 45 ms — h2https://static.dazndn.com/fonts/DAZNTrim_v2.9_italic_600.woff2static.dazndn.com/fonts/DAZNTrim_v2... https://static.dazndn.com/fonts/DAZNTrim_v2.9_italic_600.woff2 — 200 — 56.4 KiB — 49 ms — h2https://static.dazndn.com/fonts/DAZNTrimCondensed_v1.0_normal_400.woff2static.dazndn.com/fonts/DAZNTrimCon... https://static.dazndn.com/fonts/DAZNTrimCondensed_v1.0_normal_400.woff2 — 200 — 24.6 KiB — 51 ms — h2https://static.dazndn.com/fonts/DAZNTrimCondensed_v1.0_normal_700.woff2static.dazndn.com/fonts/DAZNTrimCon... https://static.dazndn.com/fonts/DAZNTrimCondensed_v1.0_normal_700.woff2 — 200 — 25.0 KiB — 53 ms — h2https://static.dazndn.com/fonts/Oscine_v2.001_normal_700.woff2static.dazndn.com/fonts/Oscine_v2.0... https://static.dazndn.com/fonts/Oscine_v2.001_normal_700.woff2 — 200 — 42.0 KiB — 52 ms — h2https://static.dazndn.com/fonts/Oscine_v2.001_normal_800.woff2static.dazndn.com/fonts/Oscine_v2.0... https://static.dazndn.com/fonts/Oscine_v2.001_normal_800.woff2 — 200 — 43.0 KiB — 54 ms — h2https://static.dazndn.com/fonts/Inter-Bold.woff2static.dazndn.com/fonts/Inter-Bold.... https://static.dazndn.com/fonts/Inter-Bold.woff2 — 200 — 112.9 KiB — 56 ms — h2https://www.dazn.com/static/boot-29.324.0-fba5a171a9c8268be362.jswww.dazn.com/static/boot-29.324.0-f... https://www.dazn.com/static/boot-29.324.0-fba5a171a9c8268be362.js — 200 — 213.1 KiB — 51 ms — h2https://www.dazn.com/icons/manifest.jsonwww.dazn.com/icons/manifest.json https://www.dazn.com/icons/manifest.json — 200 — 909 B — 18 ms — h3https://www.dazn.com/static/main-29.324.0-1316854eb3135b2b0a5b424aad0aa0a2.csswww.dazn.com/static/main-29.324.0-1... https://www.dazn.com/static/main-29.324.0-1316854eb3135b2b0a5b424aad0aa0a2.css — 200 — 1.8 KiB — 6 ms — h3https://themepark.fe.indazn.com/manifest.jsonthemepark.fe.indazn.com/manifest.js... https://themepark.fe.indazn.com/manifest.json — 200 — 790 B — 9 ms — h2https://js-agent.newrelic.com/nr-spa-1.261.1.min.jsjs-agent.newrelic.com/nr-spa-1.261.... https://js-agent.newrelic.com/nr-spa-1.261.1.min.js — 200 — 31.3 KiB — 8 ms — h2https://www.dazn.com/favicon.svgwww.dazn.com/favicon.svg https://www.dazn.com/favicon.svg — 200 — 1.4 KiB — 9 ms — h3https://themepark.fe.indazn.com/v0.158.0/dazn.cssthemepark.fe.indazn.com/v0.158.0/da... https://themepark.fe.indazn.com/v0.158.0/dazn.css — 200 — 4.7 KiB — 8 ms — h2https://www.dazn.com/icons/android-chrome-192x192.pngwww.dazn.com/icons/android-chrome-1... https://www.dazn.com/icons/android-chrome-192x192.png — 200 — 1.7 KiB — 6 ms — h3https://bam.nr-data.net/1/c19d614eaa?a=928521288&sa=1&v=1.261.1&t=Unnamed%20Transaction&rst=184&ck=0&s=0&ref=https://www.dazn.com/&ptid=9ec337083119a36f&af=err,spa,xhr,stn,ins&be=20&fe=129&dc=126&perf=%7B%22timing%22:%7B%22of%22:1776901796061,%22n%22:0,%22f%22:9,%22dn%22:10,%22dne%22:11,%22c%22:11,%22s%22:12,%22ce%22:15,%22rq%22:15,%22rp%22:20,%22rpe%22:22,%22di%22:146,%22ds%22:146,%22de%22:146,%22dc%22:147,%22l%22:147,%22le%22:149%7D,%22navigation%22:%7B%7D%7Dbam.nr-data.net/1/c19d614eaa?a=9285... https://bam.nr-data.net/1/c19d614eaa?a=928521288&sa=1&v=1.261.1&t=Unnamed%20Transaction&rst=184&ck=0&s=0&ref=https://www.dazn.com/&ptid=9ec337083119a36f&af=err,spa,xhr,stn,ins&be=20&fe=129&dc=126&perf=%7B%22timing%22:%7B%22of%22:1776901796061,%22n%22:0,%22f%22:9,%22dn%22:10,%22dne%22:11,%22c%22:11,%22s%22:12,%22ce%22:15,%22rq%22:15,%22rp%22:20,%22rpe%22:22,%22di%22:146,%22ds%22:146,%22de%22:146,%22dc%22:147,%22l%22:147,%22le%22:149%7D,%22navigation%22:%7B%7D%7D — 200 — 671 B — 447 ms — http/1.1https://startup.core.indazn.com/v1/main/web?Platform=web&LandingPageKey=generic&Brand=daznstartup.core.indazn.com/v1/main/web... https://startup.core.indazn.com/v1/main/web?Platform=web&LandingPageKey=generic&Brand=dazn — -1 — 0 B — 38 ms — https://startup.core.indazn.com/v1/main/web?Platform=web&LandingPageKey=generic&Brand=daznstartup.core.indazn.com/v1/main/web... https://startup.core.indazn.com/v1/main/web?Platform=web&LandingPageKey=generic&Brand=dazn — 403 — 0 B — 36 ms — h2https://features.fe.indazn.com/production/datafile-tag-web.jsonfeatures.fe.indazn.com/production/d... https://features.fe.indazn.com/production/datafile-tag-web.json — 200 — 210.4 KiB — 8 ms — h2https://safe.dazn.com/v4/status/safe.dazn.com/v4/status/ https://safe.dazn.com/v4/status/ — 200 — 2.9 KiB — 86 ms — h2data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCA4M…data:image/svg+xml;base64,PHN2ZyB4b... data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCA4M… — 200 — 0 B — 0 ms — datahttps://bam.nr-data.net/ins/1/c19d614eaa?a=928521288&sa=1&v=1.261.1&t=Unnamed%20Transaction&rst=643&ck=0&s=0&ref=https://www.dazn.com/&ptid=9ec337083119a36fbam.nr-data.net/ins/1/c19d614eaa?a=... https://bam.nr-data.net/ins/1/c19d614eaa?a=928521288&sa=1&v=1.261.1&t=Unnamed%20Transaction&rst=643&ck=0&s=0&ref=https://www.dazn.com/&ptid=9ec337083119a36f — 204 — 338 B — 111 ms — http/1.1https://bam.nr-data.net/events/1/c19d614eaa?a=928521288&sa=1&v=1.261.1&t=Unnamed%20Transaction&rst=760&ck=0&s=0&ref=https://www.dazn.com/&ptid=9ec337083119a36fbam.nr-data.net/events/1/c19d614eaa... https://bam.nr-data.net/events/1/c19d614eaa?a=928521288&sa=1&v=1.261.1&t=Unnamed%20Transaction&rst=760&ck=0&s=0&ref=https://www.dazn.com/&ptid=9ec337083119a36f — 200 — 365 B — 111 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 140ms · 213KB · $2/mo
Unattributable
Other
Optional
Execution 84ms
Transfer 0 KB
Monthly Cost $1/mo
www.dazn.com
Other
Optional
Execution 56ms
Transfer 213 KB
Unused 68%
Monthly Cost $1/mo

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

68% of www.dazn.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

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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