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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
4
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
72
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
82
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
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.

609 ms

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

1.55 s

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

370 ms

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

0.002

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

2.85 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.

7.81 s

Page Load Progression

573 ms
1.1 s
1.7 s
2.3 s
2.9 s
3.4 s
4.0 s
4.6 s
Checks
14
5 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
3.9 MB transferred, 517 requests
FIX
3.9 MB transferred, 517 requests
Warning::
Page weighs 11.1 MB (3.9 MB transferred)
Warning::
JavaScript is 2.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.1 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 207 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 207 KB
Warning::
517 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.81 g CO2 per page load
3.9 MB / 2.4 MB budget
3.9 MB transferred
517 requests
0.81 g CO2 per page load
JavaScript 2.1 MiB 55%
Images 1.1 MiB 28%
HTML 210.9 KiB 5%
Fonts 207.5 KiB 5%
Other 95.9 KiB 2%
Other 78.7 KiB 2%
CSS 27.4 KiB 1%
Other 22.8 KiB 1%
Other 6.2 KiB 0%
Other 0 B 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

D
Third-Party Impact
Action
77% third-party, 0 ms blocking
FIX
77% third-party, 0 ms blocking
Warning::
Third-party code accounts for 77% of page weight (3.0 MiB of 3.9 MiB)
Info::
Third-party blocking time is low (0 ms)
23%
77%
First-party Third-party
D
JS Execution Cost
Action
3419ms total JS execution
FIX
3419ms total JS execution
Warning::
Unattributable: 725ms CPU time
Warning::
https://www.engadget.com/_gdgt/_next/static/chunks...: 451ms CPU time
Warning::
https://s.yimg.com/aaq/f10d509c/dnt3mrnrwwk1.js: 337ms CPU time
Warning::
https://www.engadget.com/: 283ms CPU time
Warning::
https://s.yimg.com/aaq/prebid/prebid-current.js: 266ms CPU time
Warning::
Third-party scripts: 2571ms (75% of total)

Main Thread Breakdown

Script Evaluation 58% Other 23% Script Parsing & Compilation 9% Style & Layout 4%
ScriptTotalScriptingParse/CompileParty
Unattributable725ms87ms0ms3rd
https://www.engadget.com/_gdgt/_next/static/chunks/vendor-8d0e6c4675dab796.js451ms336ms92ms1st
https://s.yimg.com/aaq/f10d509c/dnt3mrnrwwk1.js337ms316ms12ms3rd
https://www.engadget.com/283ms37ms10ms1st
https://s.yimg.com/aaq/prebid/prebid-current.js266ms234ms17ms3rd
https://cdn.taboola.com/libtrc/yahoo-engadget-network/loader.js263ms179ms39ms3rd
https://s.yimg.com/du/benji/benji-2.js254ms234ms5ms3rd
https://s.yimg.com/du/ay/wnsrvbjmeprtfrnfx.js201ms176ms4ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604060101/pubads_impl.js?cb=31097681187ms119ms27ms3rd
chrome-error://chromewebdata/164ms36ms73ms3rd

Showing top 10 of 13 scripts

F
JS Bundles
Action
51 scripts, 970 KB unused
FIX
51 scripts, 970 KB unused
Warning::
https://www.engadget.com/_gdgt/_next/static/chunks...: 356 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.taboola.com/libtrc/yahoo-engadget-netw...: 181 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://wnsrvbjmeprtfrnfx.ay.delivery/floorPrice/w...: 135 KB unused (98%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 83 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-H2EP...: 59 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 970 KB
970 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.engadget.com/_gdgt/_next/static/chunks/vendor-8d0e6c4675dab796.js589 KB356 KB (60%)✓1st
https://cdn.taboola.com/libtrc/yahoo-engadget-network/loader.js311 KB181 KB (61%)✓3rd
https://wnsrvbjmeprtfrnfx.ay.delivery/floorPrice/wnsrvBJmEPrTfrnFX/js/floorPrice/linreg.min.js139 KB135 KB (98%)✓3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604060101/pubads_impl.js?cb=31097681183 KB83 KB (45%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-H2EP6H9Y3S160 KB59 KB (37%)✓3rd
https://s.yimg.com/aaq/prebid/prebid-current.js170 KB54 KB (37%)✓3rd
https://wnsrvbjmeprtfrnfx.ay.delivery/forest/wnsrvBJmEPrTfrnFX/js/bid/forest.min.js56 KB52 KB (94%)✓3rd
https://s.yimg.com/oa/consent.js49 KB30 KB (61%)✓3rd
https://s.yimg.com/du/benji/benji-2.js53 KB21 KB (39%)✓3rd
https://www.engadget.com/_gdgt/_next/static/chunks/551.767264d29bf71942.js2 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

B
Image Optimization
144 images, 0 KB saveable
REVIEW
144 images, 0 KB saveable
Info::
All images are well-optimized
144 images 1.1 MB
0 oversized -0 KB
102 legacy format
0 missing dimensions CLS risk
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
max-age=0, private
REVIEW
max-age=0, private
Info::
Cache-Control header is set
Got: max-age=0, private
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0, private

DirectiveValueMeaning
max-age0Cache for 0 seconds
private—Only browser cache, not CDN/proxy
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
4 fonts (207 KB)
PASS
4 fonts (207 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

207 KB total

Render-blocking

0

of 4

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 609 ms LCP 1.5 shttps://www.engadget.com/_gdgt/_next/static/media/4473ecc91f70f139-s.p.woff4473ecc91f70f139-s.p.woff https://www.engadget.com/_gdgt/_next/static/media/4473ecc91f70f139-s.p.woff — 64.9 KiB — 0 ms — font-display: swaphttps://www.engadget.com/_gdgt/_next/static/media/463dafcda517f24f-s.p.woff463dafcda517f24f-s.p.woff https://www.engadget.com/_gdgt/_next/static/media/463dafcda517f24f-s.p.woff — 66.5 KiB — 0 ms — font-display: swaphttps://www.engadget.com/_gdgt/_next/static/media/Guardian-Text-Sans-Web-Regular.bc9b697e.woff2Guardian-Text-Sans-Web-... https://www.engadget.com/_gdgt/_next/static/media/Guardian-Text-Sans-Web-Regular.bc9b697e.woff2 — 36.2 KiB — 0 ms — font-display: swaphttps://www.engadget.com/_gdgt/_next/static/media/Guardian-Text-Sans-Web-Bold.ca34ace2.woff2Guardian-Text-Sans-Web-... https://www.engadget.com/_gdgt/_next/static/media/Guardian-Text-Sans-Web-Bold.ca34ace2.woff2 — 40.0 KiB — 0 ms — font-display: swap
4473ecc91f70f139-s.p.woff woff swap
Size 65 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
463dafcda517f24f-s.p.woff woff swap
Size 66 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Guardian-Text-Sans-Web-... woff2 swap
Size 36 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Guardian-Text-Sans-Web-... woff2 swap
Size 40 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)

Fixing the unchecked items could save ~39 KB and ~78 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
Network Waterfall
517 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
75% of JavaScript execution is third-party
First-party Third-party 2571ms · 1039KB · $44/mo
Unattributable
Other
Costly
Execution 725ms
Transfer 0 KB
Monthly Cost $13/mo
s.yimg.com
Other
Costly
Execution 337ms
Transfer 97 KB
Monthly Cost $6/mo
s.yimg.com
Other
Costly
Execution 266ms
Transfer 170 KB
Unused 37%
Monthly Cost $5/mo
cdn.taboola.com
Other
Costly
Execution 263ms
Transfer 311 KB
Unused 61%
Monthly Cost $5/mo
s.yimg.com
Other
Costly
Execution 254ms
Transfer 53 KB
Unused 39%
Monthly Cost $4/mo
s.yimg.com
Other
Costly
Execution 201ms
Transfer 36 KB
Monthly Cost $3/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 187ms
Transfer 183 KB
Unused 45%
Monthly Cost $3/mo
chromewebdata
Other
Optional
Execution 164ms
Transfer 0 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 97ms
Transfer 160 KB
Unused 37%
Monthly Cost $2/mo
s.yimg.com
Other
Optional
Execution 76ms
Transfer 29 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 725ms and costs ~$13/month
  • s.yimg.com adds 337ms and costs ~$6/month
  • s.yimg.com adds 266ms and costs ~$5/month
  • cdn.taboola.com adds 263ms and costs ~$5/month
  • s.yimg.com adds 254ms and costs ~$4/month
  • s.yimg.com adds 201ms and costs ~$3/month

75% 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

Unattributable takes 725ms 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

s.yimg.com takes 337ms 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

s.yimg.com takes 266ms 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

cdn.taboola.com takes 263ms 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

61% of cdn.taboola.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

s.yimg.com takes 254ms 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

s.yimg.com takes 201ms 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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