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https://collinsdictionary.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
3
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
87
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
85
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

1.24 s

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

1.98 s

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

0 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.

1.28 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.

1.98 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
7 PASS 3 REVIEW 3 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 (1.2 MiB of 1.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
22 scripts, 361 KB unused
FIX
22 scripts, 361 KB unused
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 141 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.polarbyte.com/idm/hcd/pb.min.js: 117 KB unused (80%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://pagead2.googlesyndication.com/pagead/js/ad...: 35 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://pagead2.googlesyndication.com/pagead/js/ad...: 35 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.polarbyte.com/idm/hcd/iaw.min.js: 32 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 361 KB
361 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097946187 KB141 KB (75%)✓3rd
https://cdn.polarbyte.com/idm/hcd/pb.min.js147 KB117 KB (80%)✓3rd
https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js0 KB35 KB (65%)✓3rd
https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js54 KB35 KB (65%)✓3rd
https://cdn.polarbyte.com/idm/hcd/iaw.min.js87 KB32 KB (37%)✓3rd
https://www.collinsdictionary.com/common_javascripts/common.js?version=6.0.1046 KB—✓3rd
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451611 KB—✓3rd
https://securepubads.g.doubleclick.net/tag/js/gpt.js34 KB—✓3rd
https://assets.polarbyte.com/scripts/latest/reach/pb-reach.iife.min.js25 KB—✓3rd
https://assets.polarbyte.com/scripts/latest/survey/pb-survey.iife.min.js7 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

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
Page Weight Budget
1.2 MB transferred, 54 requests
REVIEW
1.2 MB transferred, 54 requests
Info::
Page weighs 3.5 MB (1.2 MB transferred)
Warning::
JavaScript is 745 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 745 KB
Info::
54 HTTP requests
Info::
Estimated 0.24 g CO2 per page load
1.2 MB / 2.4 MB budget
1.2 MB transferred
54 requests
0.24 g CO2 per page load
JavaScript 745.5 KiB 63%
Images 190.0 KiB 16%
Other 86.1 KiB 7%
Fonts 64.7 KiB 5%
HTML 56.5 KiB 5%
Other 24.4 KiB 2%
CSS 7.3 KiB 1%
Other 2.6 KiB 0%
Other 1.6 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under 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

B
Image Optimization
9 images, 0 KB saveable
REVIEW
9 images, 0 KB saveable
Warning::
https://www.collinsdictionary.com/external/images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
9 images 190 KB
0 oversized -0 KB
7 legacy format
1 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

B
Page Weight Inventory
54 resources · 1.2 MB · 361 KB savings available
REVIEW
54 resources · 1.2 MB · 361 KB savings available
Warning::
Page weight 155 KB over 1MB target
Got: 1.2 MB Expected: ≤ 1 MB
Info::
~361 KB of savings available
Warning::
53 third-party resources (100% of weight)
54 resources · 1.2 MiB · 53 third-party 154.7 KiB over 1MB target
JavaScript 71% · 831.1 KiB
Image 16% · 190.9 KiB
Font 5% · 64.7 KiB
Document 5% · 56.8 KiB
Other 2% · 27.9 KiB
CSS 1% · 7.3 KiB

~360.8 KiB of savings available

Remove unused JavaScript: 360.8 KiB
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+
JS Execution Cost
315ms total JS execution
PASS
315ms total JS execution
Info::
https://www.collinsdictionary.com/: 185ms CPU time
Info::
Unattributable: 80ms CPU time
Info::
https://cdn.polarbyte.com/idm/hcd/pb.min.js: 50ms CPU time
Warning::
Third-party scripts: 315ms (100% of total)

Main Thread Breakdown

Script Evaluation 51% Other 18% Style & Layout 16% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
https://www.collinsdictionary.com/185ms37ms4ms3rd
Unattributable80ms4ms0ms3rd
https://cdn.polarbyte.com/idm/hcd/pb.min.js50ms40ms9ms3rd
A+
Font Loading
3 fonts (65 KB)
PASS
3 fonts (65 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

65 KB total

Render-blocking

0

of 3

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 2.0 s FCP 1.2 s LCP 2.0 shttps://fonts.gstatic.com/s/opensans/v44/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B4gaVIUwaEQbjA.woff2memSYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B4gaVIUwaEQbjA.woff2 — 13.2 KiB — 29 ms — font-display: swaphttps://fonts.gstatic.com/s/lora/v37/0QIvMX1D_JOuMwr7I_FMl_E.woff20QIvMX1D_JOuMwr7I_FMl_E... https://fonts.gstatic.com/s/lora/v37/0QIvMX1D_JOuMwr7I_FMl_E.woff2 — 36.9 KiB — 35 ms — font-display: swaphttps://www.collinsdictionary.com/external/fonts/icomoon.ttf?1pqdoj&version=6.0.104icomoon.ttf https://www.collinsdictionary.com/external/fonts/icomoon.ttf?1pqdoj&version=6.0.104 — 14.6 KiB — 25 ms — font-display: swap
memSYaGs126MiZpBA-UvWbX... woff2 swap
Size 13 KB
Load time 29 ms
Start 704 ms
Risk FOUT — text flashes from fallback to web font
0QIvMX1D_JOuMwr7I_FMl_E... woff2 swap
Size 37 KB
Load time 35 ms
Start 764 ms
Risk FOUT — text flashes from fallback to web font
icomoon.ttf unknown swap
Size 15 KB
Load time 25 ms
Start 1.2 s
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 ~4 KB and ~8 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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
54 requests over 1409ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.2 s LCP 2.0 shttps://collinsdictionary.com// https://collinsdictionary.com/ — 301 — 328 B — 358 ms — h3https://www.collinsdictionary.com/www.collinsdictionary.com/ https://www.collinsdictionary.com/ — 200 — 56.5 KiB — 248 ms — h3https://cdn.cookielaw.org/consent/tcf.stub.jscdn.cookielaw.org/consent/tcf.stub.... https://cdn.cookielaw.org/consent/tcf.stub.js — -1 — 0 B — 77 ms — https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 77 ms — https://fonts.googleapis.com/css2?family=Open+Sans&family=Lora:wght@400;700&display=swapfonts.googleapis.com/css2?family=Op... https://fonts.googleapis.com/css2?family=Open+Sans&family=Lora:wght@400;700&display=swap — 200 — 2.2 KiB — 94 ms — h2https://www.googletagmanager.com/gtag/js?id=G-SS7E5PDDSKwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-SS7E5PDDSK — 200 — 174.0 KiB — 150 ms — h2https://cdn.polarbyte.com/idm/hcd/iaw.min.csscdn.polarbyte.com/idm/hcd/iaw.min.c... https://cdn.polarbyte.com/idm/hcd/iaw.min.css — 200 — 2.0 KiB — 57 ms — h3https://www.collinsdictionary.com/manifest.jsonwww.collinsdictionary.com/manifest.... https://www.collinsdictionary.com/manifest.json — 200 — 1.6 KiB — 170 ms — h3https://www.collinsdictionary.com/common_responsive/min762.css?version=6.0.104www.collinsdictionary.com/common_re... https://www.collinsdictionary.com/common_responsive/min762.css?version=6.0.104 — 200 — 621 B — 25 ms — h3https://www.collinsdictionary.com/common_responsive/min1240.css?version=6.0.104www.collinsdictionary.com/common_re... https://www.collinsdictionary.com/common_responsive/min1240.css?version=6.0.104 — 200 — 699 B — 26 ms — h3https://www.collinsdictionary.com/external/images/logo.svg?version=6.0.104www.collinsdictionary.com/external/... https://www.collinsdictionary.com/external/images/logo.svg?version=6.0.104 — 200 — 1.3 KiB — 27 ms — h3https://www.collinsdictionary.com/external/images/assistant/ai_assistant.png?version=6.0.104www.collinsdictionary.com/external/... https://www.collinsdictionary.com/external/images/assistant/ai_assistant.png?version=6.0.104 — 200 — 7.3 KiB — 26 ms — h3https://www.collinsdictionary.com/external/images/assistant/beta_yellow.png?version=6.0.104www.collinsdictionary.com/external/... https://www.collinsdictionary.com/external/images/assistant/beta_yellow.png?version=6.0.104 — 200 — 1.8 KiB — 32 ms — h3data:text/javascript,1data:text/javascript,1 data:text/javascript,1 — 200 — 0 B — 0 ms — datahttps://www.collinsdictionary.com/external/images/assistant/ai_ball_new.png?version=6.0.104www.collinsdictionary.com/external/... https://www.collinsdictionary.com/external/images/assistant/ai_ball_new.png?version=6.0.104 — 200 — 5.8 KiB — 29 ms — h3https://securepubads.g.doubleclick.net/tag/js/gpt.jssecurepubads.g.doubleclick.net/tag/... https://securepubads.g.doubleclick.net/tag/js/gpt.js — 200 — 34.1 KiB — 55 ms — h3https://cdn.polarbyte.com/idm/hcd/pb.min.jscdn.polarbyte.com/idm/hcd/pb.min.js https://cdn.polarbyte.com/idm/hcd/pb.min.js — 200 — 146.5 KiB — 94 ms — h3https://html-load.com/sdk.jshtml-load.com/sdk.js https://html-load.com/sdk.js — 200 — 42.5 KiB — 130 ms — h2https://cdn.polarbyte.com/idm/hcd/iaw.min.jscdn.polarbyte.com/idm/hcd/iaw.min.j... https://cdn.polarbyte.com/idm/hcd/iaw.min.js — 200 — 87.2 KiB — 111 ms — h3https://assets.polarbyte.com/scripts/latest/reach/pb-reach.iife.min.jsassets.polarbyte.com/scripts/latest... https://assets.polarbyte.com/scripts/latest/reach/pb-reach.iife.min.js — 200 — 25.1 KiB — 110 ms — h3https://assets.polarbyte.com/scripts/latest/survey/pb-survey.iife.min.jsassets.polarbyte.com/scripts/latest... https://assets.polarbyte.com/scripts/latest/survey/pb-survey.iife.min.js — 200 — 7.5 KiB — 108 ms — h3https://www.collinsdictionary.com/common_javascripts/common.js?version=6.0.104www.collinsdictionary.com/common_ja... https://www.collinsdictionary.com/common_javascripts/common.js?version=6.0.104 — 200 — 5.5 KiB — 36 ms — h3https://www.collinsdictionary.com/common_javascripts/common_home.js?version=6.0.104www.collinsdictionary.com/common_ja... https://www.collinsdictionary.com/common_javascripts/common_home.js?version=6.0.104 — 200 — 1.2 KiB — 29 ms — h3https://www.collinsdictionary.com/common_javascripts/common_quiz.js?version=6.0.104www.collinsdictionary.com/common_ja... https://www.collinsdictionary.com/common_javascripts/common_quiz.js?version=6.0.104 — 200 — 3.3 KiB — 34 ms — h3https://www.collinsdictionary.com/common_javascripts/common_defer.js?version=6.0.104www.collinsdictionary.com/common_ja... https://www.collinsdictionary.com/common_javascripts/common_defer.js?version=6.0.104 — 200 — 2.3 KiB — 35 ms — h3https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 68 ms — h2data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz48c3ZnIHdpZHRoPSI5OTk5O…data:image/svg+xml;base64,PD94bWwgd... data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz48c3ZnIHdpZHRoPSI5OTk5O… — 200 — 0 B — 0 ms — datahttps://ingest.promptwatch.com/js/client.min.jsingest.promptwatch.com/js/client.mi... https://ingest.promptwatch.com/js/client.min.js — 200 — 4.7 KiB — 163 ms — h2https://fonts.gstatic.com/s/opensans/v44/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B4gaVIUwaEQbjA.woff2fonts.gstatic.com/s/opensans/v44/me... https://fonts.gstatic.com/s/opensans/v44/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B4gaVIUwaEQbjA.woff2 — 200 — 13.2 KiB — 29 ms — h3https://fonts.gstatic.com/s/lora/v37/0QIvMX1D_JOuMwr7I_FMl_E.woff2fonts.gstatic.com/s/lora/v37/0QIvMX... https://fonts.gstatic.com/s/lora/v37/0QIvMX1D_JOuMwr7I_FMl_E.woff2 — 200 — 36.9 KiB — 35 ms — h3
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.2 s LCP 2.0 shttps://collinsdictionary.com// https://collinsdictionary.com/ — 301 — 328 B — 358 ms — h3https://www.collinsdictionary.com/www.collinsdictionary.com/ https://www.collinsdictionary.com/ — 200 — 56.5 KiB — 248 ms — h3https://cdn.cookielaw.org/consent/tcf.stub.jscdn.cookielaw.org/consent/tcf.stub.... https://cdn.cookielaw.org/consent/tcf.stub.js — -1 — 0 B — 77 ms — https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 77 ms — https://fonts.googleapis.com/css2?family=Open+Sans&family=Lora:wght@400;700&display=swapfonts.googleapis.com/css2?family=Op... https://fonts.googleapis.com/css2?family=Open+Sans&family=Lora:wght@400;700&display=swap — 200 — 2.2 KiB — 94 ms — h2https://www.googletagmanager.com/gtag/js?id=G-SS7E5PDDSKwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-SS7E5PDDSK — 200 — 174.0 KiB — 150 ms — h2https://cdn.polarbyte.com/idm/hcd/iaw.min.csscdn.polarbyte.com/idm/hcd/iaw.min.c... https://cdn.polarbyte.com/idm/hcd/iaw.min.css — 200 — 2.0 KiB — 57 ms — h3https://www.collinsdictionary.com/manifest.jsonwww.collinsdictionary.com/manifest.... https://www.collinsdictionary.com/manifest.json — 200 — 1.6 KiB — 170 ms — h3https://www.collinsdictionary.com/common_responsive/min762.css?version=6.0.104www.collinsdictionary.com/common_re... https://www.collinsdictionary.com/common_responsive/min762.css?version=6.0.104 — 200 — 621 B — 25 ms — h3https://www.collinsdictionary.com/common_responsive/min1240.css?version=6.0.104www.collinsdictionary.com/common_re... https://www.collinsdictionary.com/common_responsive/min1240.css?version=6.0.104 — 200 — 699 B — 26 ms — h3https://www.collinsdictionary.com/external/images/logo.svg?version=6.0.104www.collinsdictionary.com/external/... https://www.collinsdictionary.com/external/images/logo.svg?version=6.0.104 — 200 — 1.3 KiB — 27 ms — h3https://www.collinsdictionary.com/external/images/assistant/ai_assistant.png?version=6.0.104www.collinsdictionary.com/external/... https://www.collinsdictionary.com/external/images/assistant/ai_assistant.png?version=6.0.104 — 200 — 7.3 KiB — 26 ms — h3https://www.collinsdictionary.com/external/images/assistant/beta_yellow.png?version=6.0.104www.collinsdictionary.com/external/... https://www.collinsdictionary.com/external/images/assistant/beta_yellow.png?version=6.0.104 — 200 — 1.8 KiB — 32 ms — h3data:text/javascript,1data:text/javascript,1 data:text/javascript,1 — 200 — 0 B — 0 ms — datahttps://www.collinsdictionary.com/external/images/assistant/ai_ball_new.png?version=6.0.104www.collinsdictionary.com/external/... https://www.collinsdictionary.com/external/images/assistant/ai_ball_new.png?version=6.0.104 — 200 — 5.8 KiB — 29 ms — h3https://securepubads.g.doubleclick.net/tag/js/gpt.jssecurepubads.g.doubleclick.net/tag/... https://securepubads.g.doubleclick.net/tag/js/gpt.js — 200 — 34.1 KiB — 55 ms — h3https://cdn.polarbyte.com/idm/hcd/pb.min.jscdn.polarbyte.com/idm/hcd/pb.min.js https://cdn.polarbyte.com/idm/hcd/pb.min.js — 200 — 146.5 KiB — 94 ms — h3https://html-load.com/sdk.jshtml-load.com/sdk.js https://html-load.com/sdk.js — 200 — 42.5 KiB — 130 ms — h2https://cdn.polarbyte.com/idm/hcd/iaw.min.jscdn.polarbyte.com/idm/hcd/iaw.min.j... https://cdn.polarbyte.com/idm/hcd/iaw.min.js — 200 — 87.2 KiB — 111 ms — h3https://assets.polarbyte.com/scripts/latest/reach/pb-reach.iife.min.jsassets.polarbyte.com/scripts/latest... https://assets.polarbyte.com/scripts/latest/reach/pb-reach.iife.min.js — 200 — 25.1 KiB — 110 ms — h3https://assets.polarbyte.com/scripts/latest/survey/pb-survey.iife.min.jsassets.polarbyte.com/scripts/latest... https://assets.polarbyte.com/scripts/latest/survey/pb-survey.iife.min.js — 200 — 7.5 KiB — 108 ms — h3https://www.collinsdictionary.com/common_javascripts/common.js?version=6.0.104www.collinsdictionary.com/common_ja... https://www.collinsdictionary.com/common_javascripts/common.js?version=6.0.104 — 200 — 5.5 KiB — 36 ms — h3https://www.collinsdictionary.com/common_javascripts/common_home.js?version=6.0.104www.collinsdictionary.com/common_ja... https://www.collinsdictionary.com/common_javascripts/common_home.js?version=6.0.104 — 200 — 1.2 KiB — 29 ms — h3https://www.collinsdictionary.com/common_javascripts/common_quiz.js?version=6.0.104www.collinsdictionary.com/common_ja... https://www.collinsdictionary.com/common_javascripts/common_quiz.js?version=6.0.104 — 200 — 3.3 KiB — 34 ms — h3https://www.collinsdictionary.com/common_javascripts/common_defer.js?version=6.0.104www.collinsdictionary.com/common_ja... https://www.collinsdictionary.com/common_javascripts/common_defer.js?version=6.0.104 — 200 — 2.3 KiB — 35 ms — h3https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... 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h3https://static.criteo.net/js/ld/publishertag.prebid.jsstatic.criteo.net/js/ld/publisherta... https://static.criteo.net/js/ld/publishertag.prebid.js — 200 — 31.4 KiB — 75 ms — h2https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.jspagead2.googlesyndication.com/pagea... https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js — 200 — 0 B — 98 ms — h3https://ingest.promptwatch.com/eventingest.promptwatch.com/event https://ingest.promptwatch.com/event — 204 — 0 B — 166 ms — h2https://events.polarbyte.com/com.snowplowanalytics.snowplow/tp2events.polarbyte.com/com.snowplowan... https://events.polarbyte.com/com.snowplowanalytics.snowplow/tp2 — 200 — 335 B — 105 ms — h2https://securepubads.g.doubleclick.net/pagead/managed/dict/m202604210101/gptsecurepubads.g.doubleclick.net/page... https://securepubads.g.doubleclick.net/pagead/managed/dict/m202604210101/gpt — 200 — 23.0 KiB — 37 ms — h3https://www.collinsdictionary.com/cdn-cgi/rum?www.collinsdictionary.com/cdn-cgi/r... 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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 315ms · 203KB · $4/mo
www.collinsdictionary.com
Other
Optional
Execution 185ms
Transfer 56 KB
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 80ms
Transfer 0 KB
Monthly Cost $1/mo
cdn.polarbyte.com
Other
Optional
Execution 50ms
Transfer 147 KB
Unused 80%
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

80% of cdn.polarbyte.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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