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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
66
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
21
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.
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.

13.85 s

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

20.02 s

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

4.18 s

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

0.126

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

13.85 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.

27.76 s

Page Load Progression

443 ms
885 ms
1.3 s
1.8 s
2.2 s
2.7 s
3.1 s
3.5 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
4.2 MB transferred, 81 requests
FIX
4.2 MB transferred, 81 requests
Critical::
Page weighs 13.7 MB (4.2 MB transferred)
Warning::
JavaScript is 3.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 3.0 MB
Info::
Fonts are 269 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 269 KB
Info::
81 HTTP requests
Info::
Estimated 0.88 g CO2 per page load
4.2 MB / 2.4 MB budget
4.2 MB transferred
81 requests
0.88 g CO2 per page load
JavaScript 3.0 MiB 71%
Images 689.9 KiB 16%
Fonts 269.0 KiB 6%
Other 178.3 KiB 4%
HTML 45.4 KiB 1%
Other 30.4 KiB 1%
CSS 30.3 KiB 1%
Other 10.0 KiB 0%
Other 509 B 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

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

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 (4.2 MiB of 4.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
13956ms total JS execution
FIX
13956ms total JS execution
Warning::
https://b.cdnst.net/javascript/speedtest-main.js?v...: 6057ms CPU time
Warning::
Unattributable: 2554ms CPU time
Warning::
https://cdn.ziffstatic.com/jst/otBannerSdk.202512....: 742ms CPU time
Warning::
https://client.aps.amazon-adsystem.com/publisher.j...: 620ms CPU time
Warning::
https://www.googletagmanager.com/gtag/destination?...: 539ms CPU time
Warning::
Third-party scripts: 13956ms (100% of total)

Main Thread Breakdown

Script Evaluation 68% Script Parsing & Compilation 15% Other 11%
ScriptTotalScriptingParse/CompileParty
https://b.cdnst.net/javascript/speedtest-main.js?v=740e4726565b535af6c9481d7ff91b6a6057ms4486ms1126ms3rd
Unattributable2554ms1471ms0ms3rd
https://cdn.ziffstatic.com/jst/otBannerSdk.202512.1.0.js742ms550ms106ms3rd
https://client.aps.amazon-adsystem.com/publisher.js620ms459ms65ms3rd
https://www.googletagmanager.com/gtag/destination?id=G-KKLSRK6J1Z&cx=c&gtm=4e64f0539ms431ms103ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-K7SNBZ535ms400ms115ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604130101/pubads_impl.js489ms348ms135ms3rd
https://www.speedtest.net/391ms29ms13ms3rd
https://cdn.ziffstatic.com/pg/speedtest.prebid.js344ms193ms134ms3rd
https://securepubads.g.doubleclick.net/tag/js/gpt.js313ms169ms26ms3rd

Showing top 10 of 17 scripts

F
JS Bundles
Action
20 scripts, 1.7 MB unused
FIX
20 scripts, 1.7 MB unused
Warning::
https://b.cdnst.net/javascript/speedtest-main.js?v...: 928 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.ziffstatic.com/pg/speedtest.prebid.js: 188 KB unused (81%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 131 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://accounts.google.com/gsi/client?hl=en: 80 KB unused (83%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.ziffstatic.com/jst/otBannerSdk.202512....: 72 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.7 MB
1699 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://b.cdnst.net/javascript/speedtest-main.js?v=740e4726565b535af6c9481d7ff91b6a1518 KB928 KB (62%)✓3rd
https://cdn.ziffstatic.com/pg/speedtest.prebid.js232 KB188 KB (81%)✓3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604130101/pubads_impl.js188 KB131 KB (70%)✓3rd
https://accounts.google.com/gsi/client?hl=en96 KB80 KB (83%)✓3rd
https://cdn.ziffstatic.com/jst/otBannerSdk.202512.1.0.js126 KB72 KB (57%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=G-KKLSRK6J1Z&cx=c&gtm=4e64f0169 KB67 KB (40%)✓3rd
https://www.googleoptimize.com/optimize.js?id=GTM-MPW4L3J112 KB65 KB (59%)✓3rd
https://openads-cdn.adsrvr.org/openadsjs/build/v1.0/ziffdavis/openads.js90 KB61 KB (69%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-K7SNBZ139 KB58 KB (42%)✓3rd
https://client.aps.amazon-adsystem.com/publisher.js83 KB49 KB (60%)✓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

F
Page Weight Inventory
Action
81 resources · 4.2 MB · 1.7 MB savings available
FIX
81 resources · 4.2 MB · 1.7 MB savings available
Warning::
Page weight 3.2 MB over 1MB target
Got: 4.2 MB Expected: ≤ 1 MB
Info::
~1.7 MB of savings available
Warning::
80 third-party resources (100% of weight)
Info::
2 resources over 200KB
81 resources · 4.2 MiB · 80 third-party 3.2 MiB over 1MB target
JavaScript 71% · 3.0 MiB
Image 16% · 696.8 KiB
Font 6% · 269.0 KiB
Other 5% · 204.3 KiB
Document 1% · 45.7 KiB
CSS 1% · 35.0 KiB

~1.7 MiB of savings available

Remove unused JavaScript: 1.7 MiB
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
18 images, 0 KB saveable
REVIEW
18 images, 0 KB saveable
Warning::
https://b.cdnst.net/images/icg_troubleshoot_wifi.s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://b.cdnst.net/images/icg_check_outages.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://b.cdnst.net/images/icg_talk_to_isp.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://b.cdnst.net/images/mobile-badges/google-pl... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.speedtest.net/images/scroll_for_more.s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://b.cdnst.net/images/icg_how_much_speed.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://b.cdnst.net/images/app-promo-image@2x.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://b.cdnst.net/images/mobile_apps.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://b.cdnst.net/images/icg_get_help.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
18 images 690 KB
0 oversized -0 KB
18 legacy format
9 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

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
4 fonts (269 KB)
PASS
4 fonts (269 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

269 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 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 20.0 s FCP 13.9 s LCP 20.0 shttps://www.speedtest.net/s/fonts/Montserrat-VariableFont_wght-kern-latin.woff2Montserrat-VariableFont... https://www.speedtest.net/s/fonts/Montserrat-VariableFont_wght-kern-latin.woff2 — 28.6 KiB — 45 ms — font-display: swaphttps://www.speedtest.net/s/fonts/gaugemono-regular-webfont.woff2gaugemono-regular-webfo... https://www.speedtest.net/s/fonts/gaugemono-regular-webfont.woff2 — 4.3 KiB — 47 ms — font-display: swaphttps://www.speedtest.net/s/fonts/Montserrat-VariableFont_wght-hint-all.woff2Montserrat-VariableFont... https://www.speedtest.net/s/fonts/Montserrat-VariableFont_wght-hint-all.woff2 — 116.1 KiB — 63 ms — font-display: swaphttps://www.speedtest.net/s/fonts/Montserrat-Italic-VariableFont_wght-hint-all.woff2Montserrat-Italic-Varia... https://www.speedtest.net/s/fonts/Montserrat-Italic-VariableFont_wght-hint-all.woff2 — 120.0 KiB — 62 ms — font-display: swap
Montserrat-VariableFont... woff2 swap
Size 29 KB
Load time 45 ms
Start 265 ms
Risk FOUT — text flashes from fallback to web font
gaugemono-regular-webfo... woff2 swap
Size 4 KB
Load time 47 ms
Start 265 ms
Risk FOUT — text flashes from fallback to web font
Montserrat-VariableFont... woff2 swap
Size 116 KB
Load time 63 ms
Start 280 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
Montserrat-Italic-Varia... woff2 swap
Size 120 KB
Load time 62 ms
Start 280 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 ~118 KB and ~236 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
9 hints, 0 missing preconnects
PASS
9 hints, 0 missing preconnects
Info::
Page uses 9 resource hint(s)

Current Resource Hints

preconnect
1
preload
7
dns-prefetch
1
prefetch
—

9 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
81 requests over 5437ms
INFO
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 20.0 s FCP 13.9 s LCP 20.0 shttps://speedtest.net// https://speedtest.net/ — 301 — 174 B — 11 ms — h2https://www.speedtest.net/www.speedtest.net/ https://www.speedtest.net/ — 200 — 45.4 KiB — 230 ms — h2https://cdn.ziffstatic.com/jst/zdconsent.jscdn.ziffstatic.com/jst/zdconsent.js https://cdn.ziffstatic.com/jst/zdconsent.js — 302 — 113 B — 93 ms — h2https://cdn.ziffstatic.com/pg/speedtest.jscdn.ziffstatic.com/pg/speedtest.js https://cdn.ziffstatic.com/pg/speedtest.js — 200 — 33.5 KiB — 66 ms — h2https://cdn.ziffstatic.com/pg/speedtest.csscdn.ziffstatic.com/pg/speedtest.css https://cdn.ziffstatic.com/pg/speedtest.css — 200 — 1.2 KiB — 30 ms — h2https://cdn.ziffstatic.com/pg/speedtest.prebid.jscdn.ziffstatic.com/pg/speedtest.pre... https://cdn.ziffstatic.com/pg/speedtest.prebid.js — 200 — 232.1 KiB — 86 ms — h2https://securepubads.g.doubleclick.net/tag/js/gpt.jssecurepubads.g.doubleclick.net/tag/... https://securepubads.g.doubleclick.net/tag/js/gpt.js — 200 — 34.0 KiB — 68 ms — h3https://www.speedtest.net/s/fonts/Montserrat-VariableFont_wght-kern-latin.woff2www.speedtest.net/s/fonts/Montserra... https://www.speedtest.net/s/fonts/Montserrat-VariableFont_wght-kern-latin.woff2 — 200 — 28.6 KiB — 45 ms — h2https://www.speedtest.net/s/fonts/gaugemono-regular-webfont.woff2www.speedtest.net/s/fonts/gaugemono... https://www.speedtest.net/s/fonts/gaugemono-regular-webfont.woff2 — 200 — 4.3 KiB — 47 ms — h2https://b.cdnst.net/styles/main.c94cd88435f3e907a9963e080e58198b.cssb.cdnst.net/styles/main.c94cd88435f... https://b.cdnst.net/styles/main.c94cd88435f3e907a9963e080e58198b.css — 200 — 29.1 KiB — 50 ms — h2https://b.cdnst.net/javascript/ads/ad.jsb.cdnst.net/javascript/ads/ad.js https://b.cdnst.net/javascript/ads/ad.js — 200 — 237 B — 41 ms — h2https://www.googleoptimize.com/optimize.js?id=GTM-MPW4L3Jwww.googleoptimize.com/optimize.js?... https://www.googleoptimize.com/optimize.js?id=GTM-MPW4L3J — 200 — 111.8 KiB — 102 ms — h2https://www.speedtest.net/s/fonts/Montserrat-VariableFont_wght-hint-all.woff2www.speedtest.net/s/fonts/Montserra... https://www.speedtest.net/s/fonts/Montserrat-VariableFont_wght-hint-all.woff2 — 200 — 116.1 KiB — 63 ms — h2https://www.speedtest.net/s/fonts/Montserrat-Italic-VariableFont_wght-hint-all.woff2www.speedtest.net/s/fonts/Montserra... https://www.speedtest.net/s/fonts/Montserrat-Italic-VariableFont_wght-hint-all.woff2 — 200 — 120.0 KiB — 62 ms — h2https://b.cdnst.net/manifest.webmanifestb.cdnst.net/manifest.webmanifest https://b.cdnst.net/manifest.webmanifest — 200 — 509 B — 18 ms — h2https://client.aps.amazon-adsystem.com/publisher.jsclient.aps.amazon-adsystem.com/publ... https://client.aps.amazon-adsystem.com/publisher.js — 200 — 82.5 KiB — 41 ms — h2https://cdn.ziffstatic.com/jst/zdconsent_eu.jscdn.ziffstatic.com/jst/zdconsent_eu... https://cdn.ziffstatic.com/jst/zdconsent_eu.js — 200 — 27.8 KiB — 13 ms — h2https://cdn.cookielaw.org/consent/0e4c9041-0c35-490f-b926-1d99a6a6ecc0/0e4c9041-0c35-490f-b926-1d99a6a6ecc0.jsoncdn.cookielaw.org/consent/0e4c9041-... https://cdn.cookielaw.org/consent/0e4c9041-0c35-490f-b926-1d99a6a6ecc0/0e4c9041-0c35-490f-b926-1d99a6a6ecc0.json — 200 — 2.6 KiB — 37 ms — h2https://accounts.google.com/gsi/client?hl=enaccounts.google.com/gsi/client?hl=e... https://accounts.google.com/gsi/client?hl=en — 200 — 96.0 KiB — 60 ms — h2https://appleid.cdn-apple.com/appleauth/static/jsapi/appleid/1/en_US/appleid.auth.jsappleid.cdn-apple.com/appleauth/sta... https://appleid.cdn-apple.com/appleauth/static/jsapi/appleid/1/en_US/appleid.auth.js — 200 — 17.4 KiB — 25 ms — http/1.1https://geolocation.onetrust.com/cookieconsentpub/v1/geo/locationgeolocation.onetrust.com/cookiecons... https://geolocation.onetrust.com/cookieconsentpub/v1/geo/location — 200 — 309 B — 34 ms — h2https://config.aps.amazon-adsystem.com/configs/3336config.aps.amazon-adsystem.com/conf... https://config.aps.amazon-adsystem.com/configs/3336 — 200 — 2.1 KiB — 38 ms — h2https://openads-cdn.adsrvr.org/openadsjs/build/v1.0/ziffdavis/openads.jsopenads-cdn.adsrvr.org/openadsjs/bu... https://openads-cdn.adsrvr.org/openadsjs/build/v1.0/ziffdavis/openads.js — 200 — 89.9 KiB — 77 ms — h2https://b.cdnst.net/javascript/speedtest-main.js?v=740e4726565b535af6c9481d7ff91b6ab.cdnst.net/javascript/speedtest-ma... https://b.cdnst.net/javascript/speedtest-main.js?v=740e4726565b535af6c9481d7ff91b6a — 200 — 1.5 MiB — 220 ms — h2https://cdn.ziffstatic.com/jst/otBannerSdk.202512.1.0.jscdn.ziffstatic.com/jst/otBannerSdk.... https://cdn.ziffstatic.com/jst/otBannerSdk.202512.1.0.js — 200 — 126.2 KiB — 27 ms — h3https://cdn.cookielaw.org/consent/0e4c9041-0c35-490f-b926-1d99a6a6ecc0/019a26a1-6258-7629-988f-17f7ea9106f6/en.jsoncdn.cookielaw.org/consent/0e4c9041-... https://cdn.cookielaw.org/consent/0e4c9041-0c35-490f-b926-1d99a6a6ecc0/019a26a1-6258-7629-988f-17f7ea9106f6/en.json — 200 — 60.4 KiB — 42 ms — h2https://cdn.cookielaw.org/vendorlist/iab2V2Data.jsoncdn.cookielaw.org/vendorlist/iab2V2... https://cdn.cookielaw.org/vendorlist/iab2V2Data.json — 200 — 86.9 KiB — 40 ms — h2https://cdn.cookielaw.org/vendorlist/googleData.jsoncdn.cookielaw.org/vendorlist/google... https://cdn.cookielaw.org/vendorlist/googleData.json — 200 — 19.6 KiB — 32 ms — h2https://cdn.ziffstatic.com/jst/otTCF.202512.1.0.jscdn.ziffstatic.com/jst/otTCF.202512... https://cdn.ziffstatic.com/jst/otTCF.202512.1.0.js — 200 — 17.7 KiB — 7 ms — h3https://cdn.cookielaw.org/scripttemplates/202512.1.0/assets/otCenterRounded.jsoncdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202512.1.0/assets/otCenterRounded.json — 200 — 2.9 KiB — 17 ms — h2
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 20.0 s FCP 13.9 s LCP 20.0 shttps://speedtest.net// https://speedtest.net/ — 301 — 174 B — 11 ms — h2https://www.speedtest.net/www.speedtest.net/ https://www.speedtest.net/ — 200 — 45.4 KiB — 230 ms — h2https://cdn.ziffstatic.com/jst/zdconsent.jscdn.ziffstatic.com/jst/zdconsent.js https://cdn.ziffstatic.com/jst/zdconsent.js — 302 — 113 B — 93 ms — h2https://cdn.ziffstatic.com/pg/speedtest.jscdn.ziffstatic.com/pg/speedtest.js https://cdn.ziffstatic.com/pg/speedtest.js — 200 — 33.5 KiB — 66 ms — h2https://cdn.ziffstatic.com/pg/speedtest.csscdn.ziffstatic.com/pg/speedtest.css https://cdn.ziffstatic.com/pg/speedtest.css — 200 — 1.2 KiB — 30 ms — h2https://cdn.ziffstatic.com/pg/speedtest.prebid.jscdn.ziffstatic.com/pg/speedtest.pre... https://cdn.ziffstatic.com/pg/speedtest.prebid.js — 200 — 232.1 KiB — 86 ms — h2https://securepubads.g.doubleclick.net/tag/js/gpt.jssecurepubads.g.doubleclick.net/tag/... 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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 13956ms · 2883KB · €152/mo
b.cdnst.net
Other
Costly
Execution 6057ms
Transfer 1518 KB
Unused 62%
Monthly Cost €66/mo
Unattributable
Other
Costly
Execution 2554ms
Transfer 0 KB
Monthly Cost €28/mo
cdn.ziffstatic.com
Other
Costly
Execution 742ms
Transfer 126 KB
Unused 57%
Monthly Cost €8/mo
client.aps.amazon-adsystem.com
Other
Costly
Execution 620ms
Transfer 83 KB
Unused 60%
Monthly Cost €7/mo
Google Tag Manager
Tag Manager
Costly
Execution 539ms
Transfer 169 KB
Unused 40%
Monthly Cost €6/mo
Google Tag Manager
Tag Manager
Costly
Execution 535ms
Transfer 139 KB
Unused 42%
Monthly Cost €6/mo
securepubads.g.doubleclick.net
Other
Costly
Execution 489ms
Transfer 188 KB
Unused 70%
Monthly Cost €5/mo
www.speedtest.net
Other
Costly
Execution 391ms
Transfer 45 KB
Monthly Cost €4/mo
cdn.ziffstatic.com
Other
Costly
Execution 344ms
Transfer 232 KB
Unused 81%
Monthly Cost €4/mo
securepubads.g.doubleclick.net
Other
Costly
Execution 313ms
Transfer 34 KB
Monthly Cost €3/mo
openads-cdn.adsrvr.org
Other
Costly
Execution 309ms
Transfer 90 KB
Unused 69%
Monthly Cost €3/mo
cdn.ziffstatic.com
Other
Costly
Execution 262ms
Transfer 0 KB
Monthly Cost €3/mo
www.googleoptimize.com
Other
Costly
Execution 239ms
Transfer 112 KB
Unused 59%
Monthly Cost €3/mo
cdn.static.zdbb.net
Other
Costly
Execution 215ms
Transfer 0 KB
Monthly Cost €2/mo
cdn.ziffstatic.com
Other
Optional
Execution 198ms
Transfer 34 KB
Monthly Cost €2/mo
accounts.google.com
Other
Optional
Execution 93ms
Transfer 96 KB
Unused 83%
Monthly Cost €1/mo
cdn.ziffstatic.com
Other
Optional
Execution 56ms
Transfer 18 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • b.cdnst.net adds 6057ms and costs ~€66/month
  • Unattributable adds 2554ms and costs ~€28/month
  • cdn.ziffstatic.com adds 742ms and costs ~€8/month
  • client.aps.amazon-adsystem.com adds 620ms and costs ~€7/month
  • Google Tag Manager adds 539ms and costs ~€6/month
  • Google Tag Manager adds 535ms and costs ~€6/month
  • securepubads.g.doubleclick.net adds 489ms and costs ~€5/month
  • www.speedtest.net adds 391ms and costs ~€4/month
  • cdn.ziffstatic.com adds 344ms and costs ~€4/month
  • securepubads.g.doubleclick.net adds 313ms and costs ~€3/month
  • openads-cdn.adsrvr.org adds 309ms and costs ~€3/month
  • cdn.ziffstatic.com adds 262ms and costs ~€3/month
  • www.googleoptimize.com adds 239ms and costs ~€3/month
  • cdn.static.zdbb.net adds 215ms and costs ~€2/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

b.cdnst.net takes 6057ms 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

62% of b.cdnst.net'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 2554ms 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.ziffstatic.com takes 742ms 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

57% of cdn.ziffstatic.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

client.aps.amazon-adsystem.com takes 620ms 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

60% of client.aps.amazon-adsystem.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

Google Tag Manager takes 539ms 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 535ms 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

securepubads.g.doubleclick.net takes 489ms 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

70% of securepubads.g.doubleclick.net'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

www.speedtest.net takes 391ms 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.ziffstatic.com takes 344ms 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

81% of cdn.ziffstatic.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 313ms 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

openads-cdn.adsrvr.org takes 309ms 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

69% of openads-cdn.adsrvr.org'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

cdn.ziffstatic.com takes 262ms 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.googleoptimize.com takes 239ms 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

59% of www.googleoptimize.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

cdn.static.zdbb.net takes 215ms 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

83% of accounts.google.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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