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Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
4
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
37
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
77
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.

1.37 s

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

8.74 s

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

3.19 s

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

0.022

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

9.22 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.

27.14 s

Page Load Progression

673 ms
1.3 s
2.0 s
2.7 s
3.4 s
4.0 s
4.7 s
5.4 s
Checks
16
7 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
4.0 MB transferred, 384 requests
FIX
4.0 MB transferred, 384 requests
Critical::
Page weighs 11.3 MB (4.0 MB transferred)
Warning::
JavaScript is 2.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.4 MB
Warning::
Images are 1.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.0 MB
Info::
Fonts are 208 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 208 KB
Warning::
384 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.84 g CO2 per page load
4.0 MB / 2.4 MB budget
4.0 MB transferred
384 requests
0.84 g CO2 per page load
JavaScript 2.4 MiB 61%
Images 1.0 MiB 25%
Fonts 207.6 KiB 5%
HTML 183.7 KiB 5%
Other 62.3 KiB 2%
Other 55.6 KiB 1%
CSS 26.6 KiB 1%
Other 18.9 KiB 0%
Other 7.5 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 (3.1 MiB of 4.0 MiB)
Info::
Third-party blocking time is low (0 ms)
23%
77%
First-party Third-party
F
JS Execution Cost
Action
12060ms total JS execution
FIX
12060ms total JS execution
Warning::
Unattributable: 2908ms CPU time
Warning::
https://www.engadget.com/_gdgt/_next/static/chunks...: 1791ms CPU time
Warning::
https://www.engadget.com/: 1280ms CPU time
Warning::
https://s.yimg.com/aaq/prebid/prebid-current.js: 1156ms CPU time
Warning::
https://s.yimg.com/aaq/f10d509c/dnt3mrnrwwk1.js: 981ms CPU time
Warning::
Third-party scripts: 8988ms (75% of total)

Main Thread Breakdown

Script Evaluation 55% Other 25% Script Parsing & Compilation 10% Style & Layout 4%
ScriptTotalScriptingParse/CompileParty
Unattributable2908ms288ms0ms3rd
https://www.engadget.com/_gdgt/_next/static/chunks/vendor-8d0e6c4675dab796.js1791ms1343ms380ms1st
https://www.engadget.com/1280ms336ms85ms1st
https://s.yimg.com/aaq/prebid/prebid-current.js1156ms1007ms66ms3rd
https://s.yimg.com/aaq/f10d509c/dnt3mrnrwwk1.js981ms925ms36ms3rd
https://s.yimg.com/du/benji/benji-2.js955ms849ms21ms3rd
https://cdn.taboola.com/libtrc/yahoo-engadget-network/loader.js864ms601ms146ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604020101/pubads_impl.js444ms337ms75ms3rd
https://www.googletagmanager.com/gtag/js?id=G-H2EP6H9Y3S372ms304ms60ms3rd
chrome-error://chromewebdata/347ms77ms154ms3rd

Showing top 10 of 18 scripts

F
JS Bundles
Action
54 scripts, 941 KB unused
FIX
54 scripts, 941 KB unused
Warning::
https://www.engadget.com/_gdgt/_next/static/chunks...: 357 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.taboola.com/libtrc/yahoo-engadget-netw...: 190 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...: 84 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://s.yimg.com/aaq/prebid/prebid-current.js: 66 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 941 KB
941 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.engadget.com/_gdgt/_next/static/chunks/vendor-8d0e6c4675dab796.js590 KB357 KB (60%)✓1st
https://cdn.taboola.com/libtrc/yahoo-engadget-network/loader.js311 KB190 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/m202604020101/pubads_impl.js183 KB84 KB (46%)✓3rd
https://s.yimg.com/aaq/prebid/prebid-current.js170 KB66 KB (39%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-H2EP6H9Y3S160 KB59 KB (37%)✓3rd
https://s.yimg.com/oa/consent.js49 KB30 KB (61%)✓3rd
https://s.yimg.com/du/benji/benji-2.js53 KB21 KB (40%)✓3rd
https://www.engadget.com/_gdgt/_next/static/chunks/262.c91cc172c45cb910.js1 KB—✓1st
https://cdn.taboola.com/scripts/cds-pips.js?dc=sg&d=d2 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

B
Image Optimization
90 images, 0 KB saveable
REVIEW
90 images, 0 KB saveable
Info::
All images are well-optimized
90 images 1.0 MB
0 oversized -0 KB
65 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 (208 KB)
PASS
4 fonts (208 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

208 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 1.4 s LCP 8.7 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 — 65.0 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 67 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
14 hints, 0 missing preconnects
PASS
14 hints, 0 missing preconnects
Info::
Page uses 14 resource hint(s)

Current Resource Hints

preconnect
—
preload
+4
14
dns-prefetch
—
prefetch
—

14 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
Network Waterfall
384 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 8988ms · 1318KB · $155/mo
Unattributable
Other
Costly
Execution 2908ms
Transfer 0 KB
Monthly Cost $50/mo
s.yimg.com
Other
Costly
Execution 1156ms
Transfer 170 KB
Unused 39%
Monthly Cost $20/mo
s.yimg.com
Other
Costly
Execution 981ms
Transfer 97 KB
Monthly Cost $17/mo
s.yimg.com
Other
Costly
Execution 955ms
Transfer 53 KB
Unused 40%
Monthly Cost $16/mo
cdn.taboola.com
Other
Costly
Execution 864ms
Transfer 311 KB
Unused 61%
Monthly Cost $15/mo
securepubads.g.doubleclick.net
Other
Costly
Execution 444ms
Transfer 183 KB
Unused 46%
Monthly Cost $8/mo
Google Tag Manager
Tag Manager
Costly
Execution 372ms
Transfer 160 KB
Unused 37%
Monthly Cost $6/mo
chromewebdata
Other
Costly
Execution 347ms
Transfer 0 KB
Monthly Cost $6/mo
s.yimg.com
Other
Costly
Execution 225ms
Transfer 29 KB
Monthly Cost $4/mo
s.yimg.com
Other
Optional
Execution 192ms
Transfer 15 KB
Monthly Cost $3/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 133ms
Transfer 34 KB
Monthly Cost $2/mo
consent.cmp.oath.com
Other
Optional
Execution 111ms
Transfer 35 KB
Monthly Cost $2/mo
s.yimg.com
Other
Optional
Execution 109ms
Transfer 36 KB
Monthly Cost $2/mo
s.yimg.com
Other
Optional
Execution 71ms
Transfer 49 KB
Unused 61%
Monthly Cost $1/mo
ep2.adtrafficquality.google
Other
Optional
Execution 62ms
Transfer 8 KB
Monthly Cost $1/mo
wnsrvbjmeprtfrnfx.ay.delivery
Other
Optional
Execution 59ms
Transfer 139 KB
Unused 98%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 2908ms and costs ~$50/month
  • s.yimg.com adds 1156ms and costs ~$20/month
  • s.yimg.com adds 981ms and costs ~$17/month
  • s.yimg.com adds 955ms and costs ~$16/month
  • cdn.taboola.com adds 864ms and costs ~$15/month
  • securepubads.g.doubleclick.net adds 444ms and costs ~$8/month
  • Google Tag Manager adds 372ms and costs ~$6/month
  • chromewebdata adds 347ms and costs ~$6/month
  • s.yimg.com adds 225ms and costs ~$4/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 2908ms 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 1156ms 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 981ms 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 955ms 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 864ms 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

securepubads.g.doubleclick.net takes 444ms 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 372ms 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

chromewebdata takes 347ms 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 225ms 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 s.yimg.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

98% of wnsrvbjmeprtfrnfx.ay.delivery'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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