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https://collinsdictionary.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
39
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
87
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.

4.69 s

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

12.58 s

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

918 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.

6.83 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.

12.63 s

Page Load Progression

446 ms
891 ms
1.3 s
1.8 s
2.2 s
2.7 s
3.1 s
3.6 s
Checks
17
8 PASS 2 REVIEW 5 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 (1.5 MiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3465ms total JS execution
FIX
3465ms total JS execution
Warning::
https://www.collinsdictionary.com/: 615ms CPU time
Warning::
https://cdn.cookielaw.org/scripttemplates/202603.1...: 490ms CPU time
Warning::
Unattributable: 451ms CPU time
Warning::
https://cdn.cookielaw.org/scripttemplates/202603.1...: 293ms CPU time
Warning::
https://www.collinsdictionary.com/common_javascrip...: 280ms CPU time
Warning::
Third-party scripts: 3465ms (100% of total)

Main Thread Breakdown

Script Evaluation 59% Other 15% Style & Layout 13% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://www.collinsdictionary.com/615ms116ms22ms3rd
https://cdn.cookielaw.org/scripttemplates/202603.1.0/otTCF.js490ms442ms5ms3rd
Unattributable451ms23ms0ms3rd
https://cdn.cookielaw.org/scripttemplates/202603.1.0/otBannerSdk.js293ms159ms41ms3rd
https://www.collinsdictionary.com/common_javascripts/common.js?version=6.0.104280ms223ms1ms3rd
https://cdn.polarbyte.com/idm/hcd/pb.min.js225ms185ms40ms3rd
https://cdn.polarbyte.com/idm/hcd/iaw.min.js220ms166ms47ms3rd
https://www.collinsdictionary.com/cdn-cgi/challenge-platform/scripts/jsd/main.js220ms210ms3ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097963216ms168ms42ms3rd
https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js131ms114ms16ms3rd

Showing top 10 of 13 scripts

D
JS Bundles
Action
24 scripts, 420 KB unused
FIX
24 scripts, 420 KB unused
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 133 KB unused (71%)
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://cdn.cookielaw.org/scripttemplates/202603.1...: 75 KB unused (58%)
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.
Info::
Total unused JavaScript: 420 KB
420 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=31097963187 KB133 KB (71%)✓3rd
https://cdn.polarbyte.com/idm/hcd/pb.min.js147 KB117 KB (80%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202603.1.0/otBannerSdk.js130 KB75 KB (58%)✓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 KB25 KB (29%)✓3rd
https://html-load.com/sdk.js43 KB—✓3rd
https://ingest.promptwatch.com/js/client.min.js5 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
Page Weight Inventory
Action
65 resources · 1.5 MB · 420 KB savings available
FIX
65 resources · 1.5 MB · 420 KB savings available
Warning::
Page weight 491 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~420 KB of savings available
Warning::
64 third-party resources (100% of weight)
65 resources · 1.5 MiB · 64 third-party 491.5 KiB over 1MB target
JavaScript 65% · 989.0 KiB
Image 13% · 193.9 KiB
Other 13% · 189.6 KiB
Document 4% · 66.2 KiB
Font 4% · 64.7 KiB
CSS 1% · 12.0 KiB

~420.0 KiB of savings available

Remove unused JavaScript: 420.0 KiB
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
1.5 MB transferred, 65 requests
REVIEW
1.5 MB transferred, 65 requests
Info::
Page weighs 5.2 MB (1.5 MB transferred)
Warning::
JavaScript is 903 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 903 KB
Info::
65 HTTP requests
Info::
Estimated 0.31 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
65 requests
0.31 g CO2 per page load
JavaScript 903.4 KiB 60%
Other 251.3 KiB 17%
Images 193.0 KiB 13%
Fonts 64.7 KiB 4%
HTML 56.4 KiB 4%
Other 24.4 KiB 2%
Other 9.6 KiB 1%
CSS 7.3 KiB 0%
Other 5.4 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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
10 images, 0 KB saveable
REVIEW
10 images, 0 KB saveable
Info::
All images are well-optimized
10 images 193 KB
0 oversized -0 KB
8 legacy format
0 missing dimensions CLS risk
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
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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 4.7 s LCP 12.6 shttps://fonts.gstatic.com/s/opensans/v44/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B4gaVIUx6EQ.woff2memSYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B4gaVIUx6EQ.woff2 — 13.1 KiB — 25 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 — 36 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 — 26 ms — font-display: swap
memSYaGs126MiZpBA-UvWbX... woff2 swap
Size 13 KB
Load time 25 ms
Start 542 ms
Risk FOUT — text flashes from fallback to web font
0QIvMX1D_JOuMwr7I_FMl_E... woff2 swap
Size 37 KB
Load time 36 ms
Start 606 ms
Risk FOUT — text flashes from fallback to web font
icomoon.ttf unknown swap
Size 15 KB
Load time 26 ms
Start 2.3 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+
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: Cloudflare

Network Waterfall
65 requests over 2278ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 4.7 s LCP 12.6 shttps://collinsdictionary.com// https://collinsdictionary.com/ — 301 — 267 B — 165 ms — h2https://www.collinsdictionary.com/www.collinsdictionary.com/ https://www.collinsdictionary.com/ — 200 — 56.4 KiB — 234 ms — h2https://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 — 96 ms — h2https://cdn.cookielaw.org/consent/tcf.stub.jscdn.cookielaw.org/consent/tcf.stub.... https://cdn.cookielaw.org/consent/tcf.stub.js — 200 — 1.2 KiB — 107 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 98 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 — 163 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 — 81 ms — h3https://www.collinsdictionary.com/common_responsive/max761.css?version=6.0.104www.collinsdictionary.com/common_re... https://www.collinsdictionary.com/common_responsive/max761.css?version=6.0.104 — 200 — 1.0 KiB — 29 ms — h2https://www.collinsdictionary.com/common_responsive/max1239.css?version=6.0.104www.collinsdictionary.com/common_re... https://www.collinsdictionary.com/common_responsive/max1239.css?version=6.0.104 — 200 — 181 B — 31 ms — h2https://www.collinsdictionary.com/common_responsive/min321_max761.css?version=6.0.104www.collinsdictionary.com/common_re... https://www.collinsdictionary.com/common_responsive/min321_max761.css?version=6.0.104 — 200 — 119 B — 32 ms — h2https://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 — 1.1 KiB — 29 ms — h2https://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 — 7.0 KiB — 32 ms — h2https://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 — 29 ms — h3https://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 — 28 ms — h3https://www.collinsdictionary.com/manifest.jsonwww.collinsdictionary.com/manifest.... https://www.collinsdictionary.com/manifest.json — 403 — 4.8 KiB — 44 ms — h3https://cdn.cookielaw.org/consent/2cce4478-3712-4741-b72d-1210a930e08f/2cce4478-3712-4741-b72d-1210a930e08f.jsoncdn.cookielaw.org/consent/2cce4478-... https://cdn.cookielaw.org/consent/2cce4478-3712-4741-b72d-1210a930e08f/2cce4478-3712-4741-b72d-1210a930e08f.json — 200 — 2.8 KiB — 72 ms — h2data:text/javascript,1data:text/javascript,1 data:text/javascript,1 — 200 — 0 B — 0 ms — datahttps://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 — 119 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 — 212 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 — 119 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 — 117 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 — 118 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 — 30 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 — 44 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 — 29 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 — 34 ms — h3https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 101 ms — h2https://ingest.promptwatch.com/js/client.min.jsingest.promptwatch.com/js/client.mi... https://ingest.promptwatch.com/js/client.min.js — 200 — 4.7 KiB — 203 ms — h2data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz48c3ZnIHdpZHRoPSI5OTk5O…data:image/svg+xml;base64,PD94bWwgd... data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz48c3ZnIHdpZHRoPSI5OTk5O… — 200 — 0 B — 0 ms — data
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 4.7 s LCP 12.6 shttps://collinsdictionary.com// https://collinsdictionary.com/ — 301 — 267 B — 165 ms — h2https://www.collinsdictionary.com/www.collinsdictionary.com/ https://www.collinsdictionary.com/ — 200 — 56.4 KiB — 234 ms — h2https://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 — 96 ms — h2https://cdn.cookielaw.org/consent/tcf.stub.jscdn.cookielaw.org/consent/tcf.stub.... https://cdn.cookielaw.org/consent/tcf.stub.js — 200 — 1.2 KiB — 107 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 98 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 — 163 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 — 81 ms — h3https://www.collinsdictionary.com/common_responsive/max761.css?version=6.0.104www.collinsdictionary.com/common_re... https://www.collinsdictionary.com/common_responsive/max761.css?version=6.0.104 — 200 — 1.0 KiB — 29 ms — h2https://www.collinsdictionary.com/common_responsive/max1239.css?version=6.0.104www.collinsdictionary.com/common_re... https://www.collinsdictionary.com/common_responsive/max1239.css?version=6.0.104 — 200 — 181 B — 31 ms — h2https://www.collinsdictionary.com/common_responsive/min321_max761.css?version=6.0.104www.collinsdictionary.com/common_re... https://www.collinsdictionary.com/common_responsive/min321_max761.css?version=6.0.104 — 200 — 119 B — 32 ms — h2https://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 — 1.1 KiB — 29 ms — h2https://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 — 7.0 KiB — 32 ms — h2https://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 — 29 ms — h3https://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 — 28 ms — h3https://www.collinsdictionary.com/manifest.jsonwww.collinsdictionary.com/manifest.... https://www.collinsdictionary.com/manifest.json — 403 — 4.8 KiB — 44 ms — h3https://cdn.cookielaw.org/consent/2cce4478-3712-4741-b72d-1210a930e08f/2cce4478-3712-4741-b72d-1210a930e08f.jsoncdn.cookielaw.org/consent/2cce4478-... https://cdn.cookielaw.org/consent/2cce4478-3712-4741-b72d-1210a930e08f/2cce4478-3712-4741-b72d-1210a930e08f.json — 200 — 2.8 KiB — 72 ms — h2data:text/javascript,1data:text/javascript,1 data:text/javascript,1 — 200 — 0 B — 0 ms — datahttps://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 — 119 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 — 212 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 — 119 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 — 117 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 — 118 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 — 30 ms — h3https://www.collinsdictionary.com/common_javascripts/common_home.js?version=6.0.104www.collinsdictionary.com/common_ja... 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h2https://www.collinsdictionary.com/cdn-cgi/challenge-platform/scripts/jsd/main.jswww.collinsdictionary.com/cdn-cgi/c... https://www.collinsdictionary.com/cdn-cgi/challenge-platform/scripts/jsd/main.js — 302 — 221 B — 73 ms — h3https://cdn.collinsdictionary.com/images/wotd/5735cdn.collinsdictionary.com/images/wo... https://cdn.collinsdictionary.com/images/wotd/5735 — 200 — 173.2 KiB — 184 ms — h3https://www.collinsdictionary.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?www.collinsdictionary.com/cdn-cgi/c... https://www.collinsdictionary.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js? — 200 — 13.2 KiB — 22 ms — h3https://cdn.cookielaw.org/scripttemplates/202603.1.0/otBannerSdk.jscdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202603.1.0/otBannerSdk.js — 200 — 129.9 KiB — 51 ms — h2https://events.polarbyte.com/com.snowplowanalytics.snowplow/tp2events.polarbyte.com/com.snowplowan... https://events.polarbyte.com/com.snowplowanalytics.snowplow/tp2 — 200 — 0 B — 169 ms — h2https://www.collinsdictionary.com/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.6688030970413026:1776809557:O7rLN3nqnRpqq1ETlvF4OHvbb1xtfdyTnSr74k0fOwE/9effd8a8dbd302a1www.collinsdictionary.com/cdn-cgi/c... https://www.collinsdictionary.com/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.6688030970413026:1776809557:O7rLN3nqnRpqq1ETlvF4OHvbb1xtfdyTnSr74k0fOwE/9effd8a8dbd302a1 — 200 — 828 B — 24 ms — h3https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097963securepubads.g.doubleclick.net/page... https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097963 — 200 — 187.4 KiB — 68 ms — h3https://geolocation.onetrust.com/cookieconsentpub/v1/geo/location/geofeedgeolocation.onetrust.com/cookiecons... https://geolocation.onetrust.com/cookieconsentpub/v1/geo/location/geofeed — 200 — 252 B — 67 ms — h2https://cdn.polarbyte.com/idm/hcd/forbiddenads.txtcdn.polarbyte.com/idm/hcd/forbidden... https://cdn.polarbyte.com/idm/hcd/forbiddenads.txt — 200 — 1009 B — 44 ms — h3https://ingest.promptwatch.com/eventingest.promptwatch.com/event https://ingest.promptwatch.com/event — 204 — 0 B — 159 ms — h2data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mP8/x8AAwMB/6YMF6UAA…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mP8/x8AAwMB/6YMF6UAA… — 200 — 0 B — 0 ms — datahttps://ad-delivery.net/px.gif?ch=1ad-delivery.net/px.gif?ch=1 https://ad-delivery.net/px.gif?ch=1 — 200 — 611 B — 92 ms — h2https://ad-delivery.net/px.gif?ch=2ad-delivery.net/px.gif?ch=2 https://ad-delivery.net/px.gif?ch=2 — 200 — 109 B — 93 ms — h2https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.jspagead2.googlesyndication.com/pagea... https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js — 200 — 54.2 KiB — 124 ms 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200 — 4.7 KiB — 28 ms — h2https://www.collinsdictionary.com/cdn-cgi/rum?www.collinsdictionary.com/cdn-cgi/r... https://www.collinsdictionary.com/cdn-cgi/rum? — 204 — 238 B — 20 ms — h3https://www.collinsdictionary.com/manifest.jsonwww.collinsdictionary.com/manifest.... https://www.collinsdictionary.com/manifest.json — 403 — 4.8 KiB — 23 ms — h3https://www.collinsdictionary.com/favicon.ico?version=6.0.104www.collinsdictionary.com/favicon.i... https://www.collinsdictionary.com/favicon.ico?version=6.0.104 — 200 — 922 B — 27 ms — h3https://cdn.cookielaw.org/logos/2ae1f452-e8c9-4d90-b0bf-a20e7f5d026e/2cce4478-3712-4741-b72d-1210a930e08f/4a3e9031-8291-4080-8464-67e2b8aad9ca/hcd_logo.pngcdn.cookielaw.org/logos/2ae1f452-e8... https://cdn.cookielaw.org/logos/2ae1f452-e8c9-4d90-b0bf-a20e7f5d026e/2cce4478-3712-4741-b72d-1210a930e08f/4a3e9031-8291-4080-8464-67e2b8aad9ca/hcd_logo.png — 200 — 3.4 KiB — 33 ms — h2https://www.collinsdictionary.com/common_stylesheets/common_font.css?version=6.0.104www.collinsdictionary.com/common_st... https://www.collinsdictionary.com/common_stylesheets/common_font.css?version=6.0.104 — 200 — 1.7 KiB — 28 ms — h3https://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://pagead2.googlesyndication.com/pagead/ping?e=1pagead2.googlesyndication.com/pagea... https://pagead2.googlesyndication.com/pagead/ping?e=1 — 204 — 20 B — 26 ms — h3https://www.collinsdictionary.com/external/fonts/icomoon.ttf?1pqdoj&version=6.0.104www.collinsdictionary.com/external/... https://www.collinsdictionary.com/external/fonts/icomoon.ttf?1pqdoj&version=6.0.104 — 200 — 14.6 KiB — 26 ms — h3
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 3465ms · 733KB · $46/mo
www.collinsdictionary.com
Other
Costly
Execution 615ms
Transfer 56 KB
Monthly Cost $8/mo
OneTrust
Consent
Essential
Execution 490ms
Transfer 18 KB
Monthly Cost $6/mo
Unattributable
Other
Costly
Execution 451ms
Transfer 0 KB
Monthly Cost $6/mo
OneTrust
Consent
Essential
Execution 293ms
Transfer 130 KB
Unused 58%
Monthly Cost $4/mo
www.collinsdictionary.com
Other
Costly
Execution 280ms
Transfer 6 KB
Monthly Cost $4/mo
cdn.polarbyte.com
Other
Costly
Execution 225ms
Transfer 147 KB
Unused 80%
Monthly Cost $3/mo
cdn.polarbyte.com
Other
Costly
Execution 220ms
Transfer 87 KB
Unused 29%
Monthly Cost $3/mo
www.collinsdictionary.com
Other
Costly
Execution 220ms
Transfer 0 KB
Monthly Cost $3/mo
securepubads.g.doubleclick.net
Other
Costly
Execution 216ms
Transfer 187 KB
Unused 71%
Monthly Cost $3/mo
pagead2.googlesyndication.com
Other
Optional
Execution 131ms
Transfer 0 KB
Unused 65%
Monthly Cost $2/mo
assets.polarbyte.com
Other
Optional
Execution 129ms
Transfer 25 KB
Monthly Cost $2/mo
html-load.com
Other
Optional
Execution 120ms
Transfer 43 KB
Monthly Cost $2/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 73ms
Transfer 34 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.collinsdictionary.com adds 615ms and costs ~$8/month
  • Unattributable adds 451ms and costs ~$6/month
  • www.collinsdictionary.com adds 280ms and costs ~$4/month
  • cdn.polarbyte.com adds 225ms and costs ~$3/month
  • cdn.polarbyte.com adds 220ms and costs ~$3/month
  • www.collinsdictionary.com adds 220ms and costs ~$3/month
  • securepubads.g.doubleclick.net adds 216ms and costs ~$3/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.collinsdictionary.com takes 615ms 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

Unattributable takes 451ms 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

58% of OneTrust'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.collinsdictionary.com takes 280ms 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.polarbyte.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

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

cdn.polarbyte.com takes 220ms 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.collinsdictionary.com takes 220ms 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 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

71% 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

65% of pagead2.googlesyndication.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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