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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
87
GRADE
B
FIX
2
REVIEW
3
PASS
10
INFO
2

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

Mobile Desktop
70
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.
92
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.

1.68 s

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

5.51 s

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

311 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.

4.27 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.

5.52 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
17
10 PASS 3 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 (691.3 KiB of 691.9 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.

C
Image Optimization
Action
22 images, 0 KB saveable
REVIEW
22 images, 0 KB saveable
Warning::
https://www.roku.com/intl/s/1741383521562/fonts/ro... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://image.roku.com/w/assets/privacy-options.pn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
22 images 254 KB
0 oversized -0 KB
22 legacy format
2 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

C
JS Execution Cost
Action
1340ms total JS execution
REVIEW
1340ms total JS execution
Warning::
https://www.roku.com/intl?next=/&source=www.roku.c...: 319ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TKF...: 294ms CPU time
Warning::
Unattributable: 251ms CPU time
Info::
https://www.roku.com/intl/s/1741383521562/global/p...: 216ms CPU time
Info::
https://www.roku.com/intl/s/1741383521562/runtime/...: 145ms CPU time
Warning::
Third-party scripts: 1340ms (100% of total)

Main Thread Breakdown

Script Evaluation 42% Other 25% Style & Layout 16% Script Parsing & Compilation 11% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.roku.com/intl?next=/&source=www.roku.com319ms10ms11ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TKFC7L4294ms255ms28ms3rd
Unattributable251ms6ms0ms3rd
https://www.roku.com/intl/s/1741383521562/global/page.js216ms181ms35ms3rd
https://www.roku.com/intl/s/1741383521562/runtime/page.js145ms45ms73ms3rd
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451662ms26ms2ms3rd
https://www.google-analytics.com/analytics.js52ms41ms4ms3rd
B
JS Bundles
6 scripts, 127 KB unused
REVIEW
6 scripts, 127 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TKF...: 66 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.roku.com/intl/s/1741383521562/runtime/...: 61 KB unused (32%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 127 KB
127 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-TKFC7L4124 KB66 KB (54%)✓3rd
https://www.roku.com/intl/s/1741383521562/runtime/page.js194 KB61 KB (32%)✓3rd
https://www.roku.com/intl/s/1741383521562/global/page.js23 KB—✓3rd
https://www.roku.com/intl/s/1741383521562/index/page.js7 KB—✓3rd
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451611 KB—✓3rd
https://www.google-analytics.com/analytics.js21 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

A+
Page Weight Budget
692 KB transferred, 42 requests
PASS
692 KB transferred, 42 requests
Info::
Page weighs 2.1 MB (692 KB transferred)
Info::
42 HTTP requests
Info::
Estimated 0.14 g CO2 per page load
692 KB / 2.4 MB budget
692 KB transferred
42 requests
0.14 g CO2 per page load
JavaScript 380.2 KiB 55%
Images 253.8 KiB 37%
Fonts 46.7 KiB 7%
HTML 7.0 KiB 1%
Other 2.8 KiB 0%
Other 1.4 KiB 0%
0 2.4 MB 4.9 MB
Under budget
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
7 fonts (47 KB)
PASS
7 fonts (47 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

47 KB total

Render-blocking

0

of 7

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 1.7 s LCP 5.5 shttps://www.roku.com/intl/s/1741383521562/fonts/Gotham-Medium.woffGotham-Medium.woff https://www.roku.com/intl/s/1741383521562/fonts/Gotham-Medium.woff — 469 B — 52 ms — font-display: swaphttps://www.roku.com/intl/s/1741383521562/fonts/Gotham-Book.woffGotham-Book.woff https://www.roku.com/intl/s/1741383521562/fonts/Gotham-Book.woff — 250 B — 41 ms — font-display: swaphttps://www.roku.com/intl/s/1741383521562/fonts/Gotham-Bold.woffGotham-Bold.woff https://www.roku.com/intl/s/1741383521562/fonts/Gotham-Bold.woff — 256 B — 52 ms — font-display: swaphttps://www.roku.com/intl/s/1741383521562/fonts/glyphicons-roku.woffglyphicons-roku.woff https://www.roku.com/intl/s/1741383521562/fonts/glyphicons-roku.woff — 44.8 KiB — 145 ms — font-display: swaphttps://www.roku.com/intl/s/1741383521562/fonts/Gotham-Book.ttfGotham-Book.ttf https://www.roku.com/intl/s/1741383521562/fonts/Gotham-Book.ttf — 471 B — 30 ms — font-display: swaphttps://www.roku.com/intl/s/1741383521562/fonts/Gotham-Medium.ttfGotham-Medium.ttf https://www.roku.com/intl/s/1741383521562/fonts/Gotham-Medium.ttf — 254 B — 33 ms — font-display: swaphttps://www.roku.com/intl/s/1741383521562/fonts/Gotham-Bold.ttfGotham-Bold.ttf https://www.roku.com/intl/s/1741383521562/fonts/Gotham-Bold.ttf — 253 B — 30 ms — font-display: swap
Gotham-Medium.woff woff swap
Size 0 KB
Load time 52 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Gotham-Book.woff woff swap
Size 0 KB
Load time 41 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Gotham-Bold.woff woff swap
Size 0 KB
Load time 52 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
glyphicons-roku.woff woff swap
Size 45 KB
Load time 145 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Gotham-Book.ttf ttf swap
Size 0 KB
Load time 30 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Gotham-Medium.ttf ttf swap
Size 0 KB
Load time 33 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Gotham-Bold.ttf ttf swap
Size 0 KB
Load time 30 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~14 KB and ~28 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
2
preload
—
dns-prefetch
—
prefetch
—

2 resource hints configured

A
Page Weight Inventory
42 resources · 692 KB · 127 KB savings available
PASS
42 resources · 692 KB · 127 KB savings available
Info::
Within 1MB page-weight target
Got: 692 KB
Info::
~127 KB of savings available
Warning::
41 third-party resources (100% of weight)
42 resources · 691.9 KiB · 41 third-party Within 1MB page-weight target
JavaScript 55% · 380.2 KiB
Image 37% · 254.6 KiB
Font 7% · 46.7 KiB
Document 1% · 8.3 KiB
Other 0% · 2.0 KiB

~127.5 KiB of savings available

Remove unused JavaScript: 127.5 KiB
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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Hertech Ltd

Network Waterfall
42 requests over 1557ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.7 s LCP 5.5 shttps://roku.com// https://roku.com/ — 301 — 621 B — 68 ms — h2https://www.roku.com/www.roku.com/ https://www.roku.com/ — 302 — 1.3 KiB — 628 ms — h2https://www.roku.com/intl?next=/&source=www.roku.comwww.roku.com/intl?next=/&source=www... https://www.roku.com/intl?next=/&source=www.roku.com — 200 — 7.0 KiB — 220 ms — h2https://www.roku.com/intl/s/1741383521562/runtime/page.jswww.roku.com/intl/s/1741383521562/r... https://www.roku.com/intl/s/1741383521562/runtime/page.js — 200 — 193.8 KiB — 161 ms — h2https://www.roku.com/intl/s/1741383521562/global/page.jswww.roku.com/intl/s/1741383521562/g... https://www.roku.com/intl/s/1741383521562/global/page.js — 200 — 23.1 KiB — 318 ms — h2https://www.roku.com/intl/s/1741383521562/index/page.jswww.roku.com/intl/s/1741383521562/i... https://www.roku.com/intl/s/1741383521562/index/page.js — 200 — 7.3 KiB — 270 ms — h2https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 91 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-TKFC7L4www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-TKFC7L4 — 200 — 124.3 KiB — 168 ms — h2https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 96 ms — h2https://www.google-analytics.com/j/collect?v=1&_v=j102&a=985683562&t=pageview&_s=1&dl=https%3A%2F%2Fwww.roku.com%2Fintl%3Fnext%3D%2F%26source%3Dwww.roku.com&dp=%2Fintl&ul=en-us&dt=Roku&sr=412x823&vp=412x823&_u=YEBAAAABAAAAAC~&jid=751083033&gjid=1249154449&cid=1266848870.1776359699&tid=%5Bobject%20Object%5D&_gid=476293293.1776359699&_r=1&_slc=1&gtm=45He64f1h2n81TKFC7L4v77543861za200zd77543861&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115616985~115938465~115938469~117266401~118128922~118289195&npa=1&z=1563213342www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&a=985683562&t=pageview&_s=1&dl=https%3A%2F%2Fwww.roku.com%2Fintl%3Fnext%3D%2F%26source%3Dwww.roku.com&dp=%2Fintl&ul=en-us&dt=Roku&sr=412x823&vp=412x823&_u=YEBAAAABAAAAAC~&jid=751083033&gjid=1249154449&cid=1266848870.1776359699&tid=%5Bobject%20Object%5D&_gid=476293293.1776359699&_r=1&_slc=1&gtm=45He64f1h2n81TKFC7L4v77543861za200zd77543861&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115616985~115938465~115938469~117266401~118128922~118289195&npa=1&z=1563213342 — 200 — 450 B — 38 ms — h2https://www.roku.com/intl/api/1.0/umawww.roku.com/intl/api/1.0/uma https://www.roku.com/intl/api/1.0/uma — 200 — 624 B — 179 ms — h2https://www.roku.com/intl/s/1741383521562/fonts/roku-logo.svgwww.roku.com/intl/s/1741383521562/f... https://www.roku.com/intl/s/1741383521562/fonts/roku-logo.svg — 200 — 1.1 KiB — 130 ms — h2https://image.roku.com/w/assets/privacy-options.pngimage.roku.com/w/assets/privacy-opt... https://image.roku.com/w/assets/privacy-options.png — 200 — 2.7 KiB — 48 ms — h2https://image.roku.com/w/images/hero/roku-logo.pngimage.roku.com/w/images/hero/roku-l... https://image.roku.com/w/images/hero/roku-logo.png — 200 — 24.4 KiB — 54 ms — h2https://image.roku.com/w/images/hero/flags/CA.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/CA.jpg — 200 — 7.6 KiB — 46 ms — h2https://image.roku.com/w/images/hero/flags/US.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/US.jpg — 200 — 14.9 KiB — 45 ms — h2https://image.roku.com/w/images/hero/flags/FR.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/FR.jpg — 200 — 3.3 KiB — 55 ms — h2https://image.roku.com/w/images/hero/flags/DE.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/DE.jpg — 200 — 2.3 KiB — 56 ms — h2https://www.roku.com/intl/s/1741383521562/fonts/Gotham-Medium.woffwww.roku.com/intl/s/1741383521562/f... https://www.roku.com/intl/s/1741383521562/fonts/Gotham-Medium.woff — 403 — 469 B — 52 ms — h2https://www.roku.com/intl/s/1741383521562/fonts/Gotham-Book.woffwww.roku.com/intl/s/1741383521562/f... https://www.roku.com/intl/s/1741383521562/fonts/Gotham-Book.woff — 403 — 250 B — 41 ms — h2https://www.roku.com/intl/s/1741383521562/fonts/Gotham-Bold.woffwww.roku.com/intl/s/1741383521562/f... https://www.roku.com/intl/s/1741383521562/fonts/Gotham-Bold.woff — 403 — 256 B — 52 ms — h2https://www.roku.com/intl/s/1741383521562/fonts/glyphicons-roku.woffwww.roku.com/intl/s/1741383521562/f... https://www.roku.com/intl/s/1741383521562/fonts/glyphicons-roku.woff — 200 — 44.8 KiB — 145 ms — h2https://image.roku.com/w/images/hero/flags/UK.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/UK.jpg — 200 — 18.4 KiB — 24 ms — h2https://image.roku.com/w/images/hero/flags/AR.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/AR.jpg — 200 — 5.1 KiB — 26 ms — h2https://image.roku.com/w/images/hero/flags/BR.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/BR.jpg — 200 — 11.9 KiB — 46 ms — h2https://image.roku.com/w/images/hero/flags/CL.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/CL.jpg — 200 — 4.7 KiB — 28 ms — h2https://image.roku.com/w/images/hero/flags/CO.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/CO.jpg — 200 — 3.5 KiB — 44 ms — h2https://image.roku.com/w/images/hero/flags/CR.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/CR.jpg — 200 — 6.5 KiB — 31 ms — h2https://image.roku.com/w/images/hero/flags/SV.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/SV.jpg — 200 — 5.2 KiB — 29 ms — h2https://www.roku.com/cdn-cgi/rum?www.roku.com/cdn-cgi/rum? https://www.roku.com/cdn-cgi/rum? — 204 — 328 B — 38 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.7 s LCP 5.5 shttps://roku.com// https://roku.com/ — 301 — 621 B — 68 ms — h2https://www.roku.com/www.roku.com/ https://www.roku.com/ — 302 — 1.3 KiB — 628 ms — h2https://www.roku.com/intl?next=/&source=www.roku.comwww.roku.com/intl?next=/&source=www... https://www.roku.com/intl?next=/&source=www.roku.com — 200 — 7.0 KiB — 220 ms — h2https://www.roku.com/intl/s/1741383521562/runtime/page.jswww.roku.com/intl/s/1741383521562/r... https://www.roku.com/intl/s/1741383521562/runtime/page.js — 200 — 193.8 KiB — 161 ms — h2https://www.roku.com/intl/s/1741383521562/global/page.jswww.roku.com/intl/s/1741383521562/g... https://www.roku.com/intl/s/1741383521562/global/page.js — 200 — 23.1 KiB — 318 ms — h2https://www.roku.com/intl/s/1741383521562/index/page.jswww.roku.com/intl/s/1741383521562/i... https://www.roku.com/intl/s/1741383521562/index/page.js — 200 — 7.3 KiB — 270 ms — h2https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 91 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-TKFC7L4www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-TKFC7L4 — 200 — 124.3 KiB — 168 ms — h2https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 96 ms — h2https://www.google-analytics.com/j/collect?v=1&_v=j102&a=985683562&t=pageview&_s=1&dl=https%3A%2F%2Fwww.roku.com%2Fintl%3Fnext%3D%2F%26source%3Dwww.roku.com&dp=%2Fintl&ul=en-us&dt=Roku&sr=412x823&vp=412x823&_u=YEBAAAABAAAAAC~&jid=751083033&gjid=1249154449&cid=1266848870.1776359699&tid=%5Bobject%20Object%5D&_gid=476293293.1776359699&_r=1&_slc=1&gtm=45He64f1h2n81TKFC7L4v77543861za200zd77543861&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115616985~115938465~115938469~117266401~118128922~118289195&npa=1&z=1563213342www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&a=985683562&t=pageview&_s=1&dl=https%3A%2F%2Fwww.roku.com%2Fintl%3Fnext%3D%2F%26source%3Dwww.roku.com&dp=%2Fintl&ul=en-us&dt=Roku&sr=412x823&vp=412x823&_u=YEBAAAABAAAAAC~&jid=751083033&gjid=1249154449&cid=1266848870.1776359699&tid=%5Bobject%20Object%5D&_gid=476293293.1776359699&_r=1&_slc=1&gtm=45He64f1h2n81TKFC7L4v77543861za200zd77543861&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115616985~115938465~115938469~117266401~118128922~118289195&npa=1&z=1563213342 — 200 — 450 B — 38 ms — h2https://www.roku.com/intl/api/1.0/umawww.roku.com/intl/api/1.0/uma https://www.roku.com/intl/api/1.0/uma — 200 — 624 B — 179 ms — h2https://www.roku.com/intl/s/1741383521562/fonts/roku-logo.svgwww.roku.com/intl/s/1741383521562/f... https://www.roku.com/intl/s/1741383521562/fonts/roku-logo.svg — 200 — 1.1 KiB — 130 ms — h2https://image.roku.com/w/assets/privacy-options.pngimage.roku.com/w/assets/privacy-opt... https://image.roku.com/w/assets/privacy-options.png — 200 — 2.7 KiB — 48 ms — h2https://image.roku.com/w/images/hero/roku-logo.pngimage.roku.com/w/images/hero/roku-l... https://image.roku.com/w/images/hero/roku-logo.png — 200 — 24.4 KiB — 54 ms — h2https://image.roku.com/w/images/hero/flags/CA.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/CA.jpg — 200 — 7.6 KiB — 46 ms — h2https://image.roku.com/w/images/hero/flags/US.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/US.jpg — 200 — 14.9 KiB — 45 ms — h2https://image.roku.com/w/images/hero/flags/FR.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/FR.jpg — 200 — 3.3 KiB — 55 ms — h2https://image.roku.com/w/images/hero/flags/DE.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/DE.jpg — 200 — 2.3 KiB — 56 ms — h2https://www.roku.com/intl/s/1741383521562/fonts/Gotham-Medium.woffwww.roku.com/intl/s/1741383521562/f... https://www.roku.com/intl/s/1741383521562/fonts/Gotham-Medium.woff — 403 — 469 B — 52 ms — h2https://www.roku.com/intl/s/1741383521562/fonts/Gotham-Book.woffwww.roku.com/intl/s/1741383521562/f... https://www.roku.com/intl/s/1741383521562/fonts/Gotham-Book.woff — 403 — 250 B — 41 ms — h2https://www.roku.com/intl/s/1741383521562/fonts/Gotham-Bold.woffwww.roku.com/intl/s/1741383521562/f... https://www.roku.com/intl/s/1741383521562/fonts/Gotham-Bold.woff — 403 — 256 B — 52 ms — h2https://www.roku.com/intl/s/1741383521562/fonts/glyphicons-roku.woffwww.roku.com/intl/s/1741383521562/f... https://www.roku.com/intl/s/1741383521562/fonts/glyphicons-roku.woff — 200 — 44.8 KiB — 145 ms — h2https://image.roku.com/w/images/hero/flags/UK.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/UK.jpg — 200 — 18.4 KiB — 24 ms — h2https://image.roku.com/w/images/hero/flags/AR.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/AR.jpg — 200 — 5.1 KiB — 26 ms — h2https://image.roku.com/w/images/hero/flags/BR.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/BR.jpg — 200 — 11.9 KiB — 46 ms — h2https://image.roku.com/w/images/hero/flags/CL.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/CL.jpg — 200 — 4.7 KiB — 28 ms — h2https://image.roku.com/w/images/hero/flags/CO.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/CO.jpg — 200 — 3.5 KiB — 44 ms — h2https://image.roku.com/w/images/hero/flags/CR.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/CR.jpg — 200 — 6.5 KiB — 31 ms — h2https://image.roku.com/w/images/hero/flags/SV.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/SV.jpg — 200 — 5.2 KiB — 29 ms — h2https://www.roku.com/cdn-cgi/rum?www.roku.com/cdn-cgi/rum? https://www.roku.com/cdn-cgi/rum? — 204 — 328 B — 38 ms — h2https://image.roku.com/w/images/hero/flags/GT.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/GT.jpg — 200 — 6.8 KiB — 41 ms — h2https://image.roku.com/w/images/hero/flags/HN.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/HN.jpg — 200 — 6.2 KiB — 54 ms — h2https://image.roku.com/w/images/hero/flags/MX.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/MX.jpg — 200 — 7.5 KiB — 57 ms — h2https://image.roku.com/w/images/hero/flags/NI.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/NI.jpg — 200 — 5.0 KiB — 55 ms — h2https://image.roku.com/w/images/hero/flags/PA.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/PA.jpg — 200 — 6.1 KiB — 55 ms — h2https://image.roku.com/w/images/hero/flags/PE.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/PE.jpg — 200 — 8.1 KiB — 61 ms — h2https://image.roku.com/w/images/hero/flags/AU.jpgimage.roku.com/w/images/hero/flags/... https://image.roku.com/w/images/hero/flags/AU.jpg — 200 — 23.6 KiB — 62 ms — h2https://image.roku.com/w/images/hero/hero-bg-purple-grad.jpgimage.roku.com/w/images/hero/hero-b... https://image.roku.com/w/images/hero/hero-bg-purple-grad.jpg — 200 — 79.0 KiB — 64 ms — h2https://www.roku.com/favicon.icowww.roku.com/favicon.ico https://www.roku.com/favicon.ico — 200 — 908 B — 30 ms — h2https://www.roku.com/intl/s/1741383521562/fonts/Gotham-Book.ttfwww.roku.com/intl/s/1741383521562/f... https://www.roku.com/intl/s/1741383521562/fonts/Gotham-Book.ttf — 403 — 471 B — 30 ms — h2https://www.roku.com/intl/s/1741383521562/fonts/Gotham-Medium.ttfwww.roku.com/intl/s/1741383521562/f... https://www.roku.com/intl/s/1741383521562/fonts/Gotham-Medium.ttf — 403 — 254 B — 33 ms — h2https://www.roku.com/intl/s/1741383521562/fonts/Gotham-Bold.ttfwww.roku.com/intl/s/1741383521562/f... https://www.roku.com/intl/s/1741383521562/fonts/Gotham-Bold.ttf — 403 — 253 B — 30 ms — h2
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 1340ms · 380KB · €7/mo
www.roku.com
Other
Costly
Execution 319ms
Transfer 7 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Costly
Execution 294ms
Transfer 124 KB
Unused 54%
Monthly Cost €2/mo
Unattributable
Other
Costly
Execution 251ms
Transfer 0 KB
Monthly Cost €1/mo
www.roku.com
Other
Costly
Execution 216ms
Transfer 23 KB
Monthly Cost €1/mo
www.roku.com
Other
Optional
Execution 145ms
Transfer 194 KB
Unused 32%
Monthly Cost €1/mo
static.cloudflareinsights.com
Other
Optional
Execution 62ms
Transfer 11 KB
Monthly Cost €0/mo
Google Analytics
Analytics
Optional
Execution 52ms
Transfer 21 KB
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • www.roku.com adds 319ms and costs ~€2/month
  • Google Tag Manager adds 294ms and costs ~€2/month
  • Unattributable adds 251ms and costs ~€1/month
  • www.roku.com adds 216ms and costs ~€1/month

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

www.roku.com takes 319ms 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

Google Tag Manager takes 294ms 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

54% 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

Unattributable takes 251ms 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

www.roku.com takes 216ms 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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