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https://tucows.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
98
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.
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.

839 ms

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

931 ms

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

8 ms

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

0.001

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

839 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.69 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
5 PASS 4 REVIEW 4 FIX
D
Third-Party Impact
Action
82% third-party, 0 ms blocking
FIX
82% third-party, 0 ms blocking
Warning::
Third-party code accounts for 82% of page weight (1.4 MiB of 1.8 MiB)
Info::
Third-party blocking time is low (0 ms)
18%
82%
First-party Third-party
D
JS Bundles
Action
20 scripts, 325 KB unused
FIX
20 scripts, 325 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-DX6S...: 115 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://tucows.com/haqt6iy0yx2eNjI3ZTgwNmVhYmRmYTB...: 74 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://tucows.com/haqt6iy0yx2eNjI3ZTgwNmVhYmRmYTB...: 69 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-M9S...: 66 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 325 KB
325 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-DX6SC6FZEQ175 KB115 KB (66%)✓3rd
https://tucows.com/haqt6iy0yx2eNjI3ZTgwNmVhYmRmYTBhYmFiOTY3MjU5/xBMyK4m5OuhrWU8NouiwesXJXHs183 KB74 KB (40%)✓1st
https://tucows.com/haqt6iy0yx2eNjI3ZTgwNmVhYmRmYTBhYmFiOTY3MjU5/xBMyK4m5KIQCMEpr1O7PEK2rN1x7121 KB69 KB (57%)✓1st
https://www.googletagmanager.com/gtm.js?id=GTM-M9SSF3S125 KB66 KB (53%)✓3rd
https://snap.licdn.com/li.lms-analytics/insight.min.js19 KB—✓3rd
https://f.vimeocdn.com/p/4.46.43/js/player.module.js212 KB—✓3rd
https://cdn.prod.website-files.com/627e806eabdfa0abab967259/js/tucows-2022-build.schunk.c8cd7d0c04067939.js49 KB—✓3rd
https://cdn.prod.website-files.com/627e806eabdfa0abab967259/js/tucows-2022-build.schunk.36b8fb49256177c8.js14 KB—✓3rd
https://cdn.jsdelivr.net/npm/@finsweet/attributes-scrolldisable@1/scrolldisable.js4 KB—✓3rd
https://d3e54v103j8qbb.cloudfront.net/js/jquery-3.5.1.min.dc5e7f18c8.js?site=627e806eabdfa0abab96725930 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

D
Page Weight Inventory
Action
53 resources · 1.8 MB · 325 KB savings available
FIX
53 resources · 1.8 MB · 325 KB savings available
Warning::
Page weight 797 KB over 1MB target
Got: 1.8 MB Expected: ≤ 1 MB
Info::
~325 KB of savings available
Warning::
49 third-party resources (82% of weight)
Info::
1 resources over 200KB
53 resources · 1.8 MiB · 49 third-party 797.3 KiB over 1MB target
JavaScript 60% · 1.1 MiB
Image 24% · 440.6 KiB
Document 7% · 133.4 KiB
Font 6% · 100.2 KiB
CSS 3% · 58.3 KiB
Other 0% · 4.2 KiB

~324.9 KiB of savings available

Remove unused JavaScript: 324.9 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.
Info::
Last-Modified header present

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Page Weight Budget
Action
1.8 MB transferred, 53 requests
REVIEW
1.8 MB transferred, 53 requests
Info::
Page weighs 5.0 MB (1.8 MB transferred)
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
53 HTTP requests
Info::
Estimated 0.37 g CO2 per page load
1.8 MB / 2.4 MB budget
1.8 MB transferred
53 requests
0.37 g CO2 per page load
JavaScript 1.1 MiB 60%
Images 437.7 KiB 24%
HTML 133.4 KiB 7%
Fonts 100.2 KiB 6%
CSS 58.3 KiB 3%
Other 3.7 KiB 0%
Other 1.2 KiB 0%
Other 1.2 KiB 0%
Other 1.1 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
14 images, 0 KB saveable
REVIEW
14 images, 0 KB saveable
Warning::
https://cdn.prod.website-files.com/627e806eabdfa0a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
14 images 438 KB
0 oversized -0 KB
5 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
JS Execution Cost
511ms total JS execution
REVIEW
511ms total JS execution
Info::
https://tucows.com/haqt6iy0yx2eNjI3ZTgwNmVhYmRmYTB...: 115ms CPU time
Info::
https://tucows.com/: 112ms CPU time
Info::
Unattributable: 89ms CPU time
Info::
https://cdn.prod.website-files.com/627e806eabdfa0a...: 79ms CPU time
Info::
https://cdn.prod.website-files.com/627e806eabdfa0a...: 66ms CPU time
Warning::
Third-party scripts: 285ms (56% of total)

Main Thread Breakdown

Script Evaluation 51% Other 19% Script Parsing & Compilation 12% Style & Layout 11%
ScriptTotalScriptingParse/CompileParty
https://tucows.com/haqt6iy0yx2eNjI3ZTgwNmVhYmRmYTBhYmFiOTY3MjU5/xBMyK4m5OuhrWU8NouiwesXJXHs115ms95ms19ms1st
https://tucows.com/112ms9ms2ms1st
Unattributable89ms4ms0ms3rd
https://cdn.prod.website-files.com/627e806eabdfa0abab967259/js/tucows-2022-build.schunk.c8cd7d0c04067939.js79ms24ms9ms3rd
https://cdn.prod.website-files.com/627e806eabdfa0abab967259/js/tucows-2022-build.95d69acf.21512fd74682fd02.js66ms62ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-M9SSF3S51ms36ms14ms3rd
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
3 fonts (100 KB)
PASS
3 fonts (100 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

100 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 FCP 839 ms LCP 931 mshttps://cdn.prod.website-files.com/627e806eabdfa0abab967259/62964a08c22e094a87622053_Rene%20Bieder%20-%20Galano%20Grotesque%20Bold.otf62964a08c22e094a8762205... https://cdn.prod.website-files.com/627e806eabdfa0abab967259/62964a08c22e094a87622053_Rene%20Bieder%20-%20Galano%20Grotesque%20Bold.otf — 47.2 KiB — 17 ms — font-display: swaphttps://cdn.prod.website-files.com/627e806eabdfa0abab967259/62964a8b2cc1bc8c3c3896f2_Linotype%20-%20AvenirLTStd-Roman.otf62964a8b2cc1bc8c3c3896f... https://cdn.prod.website-files.com/627e806eabdfa0abab967259/62964a8b2cc1bc8c3c3896f2_Linotype%20-%20AvenirLTStd-Roman.otf — 43.5 KiB — 15 ms — font-display: swaphttps://fonts.gstatic.com/s/varela/v17/DPEtYwqExx0AWHX5Ax4EXP_TsA.woff2DPEtYwqExx0AWHX5Ax4EXP_... https://fonts.gstatic.com/s/varela/v17/DPEtYwqExx0AWHX5Ax4EXP_TsA.woff2 — 9.5 KiB — 6 ms — font-display: swap
62964a08c22e094a8762205... otf swap
Size 47 KB
Load time 17 ms
Start 162 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
62964a8b2cc1bc8c3c3896f... otf swap
Size 44 KB
Load time 15 ms
Start 163 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
DPEtYwqExx0AWHX5Ax4EXP_... woff2 swap
Size 10 KB
Load time 6 ms
Start 344 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 ~27 KB and ~54 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
53 requests over 1016ms
INFO
0 ms 500 ms 1.0 s FCP 839 ms LCP 931 mshttps://tucows.com// https://tucows.com/ — 200 — 31.4 KiB — 69 ms — h2https://cdn.prod.website-files.com/627e806eabdfa0abab967259/css/tucows-2022-build.shared.71e894cde.csscdn.prod.website-files.com/627e806e... https://cdn.prod.website-files.com/627e806eabdfa0abab967259/css/tucows-2022-build.shared.71e894cde.css — 200 — 33.6 KiB — 30 ms — h3https://ajax.googleapis.com/ajax/libs/webfont/1.6.26/webfont.jsajax.googleapis.com/ajax/libs/webfo... https://ajax.googleapis.com/ajax/libs/webfont/1.6.26/webfont.js — 200 — 5.9 KiB — 24 ms — h2https://cdn.prod.website-files.com/627e806eabdfa0abab967259/638521750a06567c82a9767b_TING3098-p-500.webpcdn.prod.website-files.com/627e806e... https://cdn.prod.website-files.com/627e806eabdfa0abab967259/638521750a06567c82a9767b_TING3098-p-500.webp — 200 — 15.9 KiB — 25 ms — h3https://cdn.prod.website-files.com/627e806eabdfa0abab967259/6324e2fbd1ce9296c82c247b_Ting-sparkles.webpcdn.prod.website-files.com/627e806e... https://cdn.prod.website-files.com/627e806eabdfa0abab967259/6324e2fbd1ce9296c82c247b_Ting-sparkles.webp — 200 — 1.1 KiB — 24 ms — h3https://d3e54v103j8qbb.cloudfront.net/js/jquery-3.5.1.min.dc5e7f18c8.js?site=627e806eabdfa0abab967259d3e54v103j8qbb.cloudfront.net/js/jq... https://d3e54v103j8qbb.cloudfront.net/js/jquery-3.5.1.min.dc5e7f18c8.js?site=627e806eabdfa0abab967259 — 200 — 30.4 KiB — 43 ms — h2https://cdn.prod.website-files.com/627e806eabdfa0abab967259/js/tucows-2022-build.schunk.36b8fb49256177c8.jscdn.prod.website-files.com/627e806e... https://cdn.prod.website-files.com/627e806eabdfa0abab967259/js/tucows-2022-build.schunk.36b8fb49256177c8.js — 200 — 13.9 KiB — 18 ms — h3https://fonts.googleapis.com/css?family=Varela:400fonts.googleapis.com/css?family=Var... https://fonts.googleapis.com/css?family=Varela:400 — 200 — 846 B — 38 ms — h2https://cdn.prod.website-files.com/627e806eabdfa0abab967259/js/tucows-2022-build.schunk.c8cd7d0c04067939.jscdn.prod.website-files.com/627e806e... https://cdn.prod.website-files.com/627e806eabdfa0abab967259/js/tucows-2022-build.schunk.c8cd7d0c04067939.js — 200 — 49.4 KiB — 35 ms — h3https://cdn.prod.website-files.com/627e806eabdfa0abab967259/js/tucows-2022-build.95d69acf.21512fd74682fd02.jscdn.prod.website-files.com/627e806e... https://cdn.prod.website-files.com/627e806eabdfa0abab967259/js/tucows-2022-build.95d69acf.21512fd74682fd02.js — 200 — 1.5 KiB — 31 ms — h3https://tucows.com/haqt6iy0yx2eNjI3ZTgwNmVhYmRmYTBhYmFiOTY3MjU5/xBMyK4m5OuhrWU8NouiwesXJXHs/haqt6iy0yx2eNjI3ZTgwNmVhYmRmYTBhYm... https://tucows.com/haqt6iy0yx2eNjI3ZTgwNmVhYmRmYTBhYmFiOTY3MjU5/xBMyK4m5OuhrWU8NouiwesXJXHs — 200 — 183.4 KiB — 129 ms — h2https://tucows.com/haqt6iy0yx2eNjI3ZTgwNmVhYmRmYTBhYmFiOTY3MjU5/xBMyK4m5KIQCMEpr1O7PEK2rN1x7/haqt6iy0yx2eNjI3ZTgwNmVhYmRmYTBhYm... https://tucows.com/haqt6iy0yx2eNjI3ZTgwNmVhYmRmYTBhYmFiOTY3MjU5/xBMyK4m5KIQCMEpr1O7PEK2rN1x7 — 200 — 121.4 KiB — 168 ms — h2https://www.googletagmanager.com/gtag/js?id=G-DX6SC6FZEQwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-DX6SC6FZEQ — 200 — 175.1 KiB — 113 ms — h2https://cdn.jsdelivr.net/npm/@finsweet/attributes-scrolldisable@1/scrolldisable.jscdn.jsdelivr.net/npm/@finsweet/attr... https://cdn.jsdelivr.net/npm/@finsweet/attributes-scrolldisable@1/scrolldisable.js — 200 — 4.5 KiB — 42 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-M9SSF3Swww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-M9SSF3S — 200 — 125.2 KiB — 89 ms — h2https://snap.licdn.com/li.lms-analytics/insight.min.jssnap.licdn.com/li.lms-analytics/ins... https://snap.licdn.com/li.lms-analytics/insight.min.js — 200 — 18.7 KiB — 50 ms — h2https://cdn.embedly.com/widgets/media.html?src=https%3A%2F%2Fplayer.vimeo.com%2Fvideo%2F718381907%3Fh%3De534ad2b10%26app_id%3D122963&dntp=1&display_name=Vimeo&url=https%3A%2F%2Fvimeo.com%2F718381907&image=https%3A%2F%2Fi.vimeocdn.com%2Fvideo%2F1448172134-1c333eeeb710e7d3d1d9c7a74d99256498dac3b224ea5e596ce0a21f6a2544ed-d_1280&key=96f1f04c5f4143bcb0f2e68c87d65feb&type=text%2Fhtml&schema=vimeocdn.embedly.com/widgets/media.html?... https://cdn.embedly.com/widgets/media.html?src=https%3A%2F%2Fplayer.vimeo.com%2Fvideo%2F718381907%3Fh%3De534ad2b10%26app_id%3D122963&dntp=1&display_name=Vimeo&url=https%3A%2F%2Fvimeo.com%2F718381907&image=https%3A%2F%2Fi.vimeocdn.com%2Fvideo%2F1448172134-1c333eeeb710e7d3d1d9c7a74d99256498dac3b224ea5e596ce0a21f6a2544ed-d_1280&key=96f1f04c5f4143bcb0f2e68c87d65feb&type=text%2Fhtml&schema=vimeo — 200 — 90.9 KiB — 60 ms — http/1.1https://cdn.prod.website-files.com/627e806eabdfa0abab967259/62964a08c22e094a87622053_Rene%20Bieder%20-%20Galano%20Grotesque%20Bold.otfcdn.prod.website-files.com/627e806e... https://cdn.prod.website-files.com/627e806eabdfa0abab967259/62964a08c22e094a87622053_Rene%20Bieder%20-%20Galano%20Grotesque%20Bold.otf — 200 — 47.2 KiB — 17 ms — h3https://cdn.prod.website-files.com/627e806eabdfa0abab967259/62964a8b2cc1bc8c3c3896f2_Linotype%20-%20AvenirLTStd-Roman.otfcdn.prod.website-files.com/627e806e... https://cdn.prod.website-files.com/627e806eabdfa0abab967259/62964a8b2cc1bc8c3c3896f2_Linotype%20-%20AvenirLTStd-Roman.otf — 200 — 43.5 KiB — 15 ms — h3https://cdn.prod.website-files.com/627e806eabdfa0abab967259/65e20c9ea4062c3889cfbd0f_f26f2552b07b3bf3a843d90bfeb49784_Tucows_square.pngcdn.prod.website-files.com/627e806e... https://cdn.prod.website-files.com/627e806eabdfa0abab967259/65e20c9ea4062c3889cfbd0f_f26f2552b07b3bf3a843d90bfeb49784_Tucows_square.png — 200 — 2.6 KiB — 15 ms — h3https://cdn.prod.website-files.com/627e806eabdfa0abab967259/62fe476af9e6125501ec99a2_Fiber-installers-p-500.webpcdn.prod.website-files.com/627e806e... https://cdn.prod.website-files.com/627e806eabdfa0abab967259/62fe476af9e6125501ec99a2_Fiber-installers-p-500.webp — 200 — 46.3 KiB — 40 ms — h3https://cdn.prod.website-files.com/627e806eabdfa0abab967259/637fd6b0232a608e7d19b0ee_Ting-team-p-800.webpcdn.prod.website-files.com/627e806e... https://cdn.prod.website-files.com/627e806eabdfa0abab967259/637fd6b0232a608e7d19b0ee_Ting-team-p-800.webp — 200 — 75.1 KiB — 46 ms — h3https://cdn.prod.website-files.com/627e806eabdfa0abab967259/62e2b0fba0640e7cda4039b9_o-pattern-L.svgcdn.prod.website-files.com/627e806e... https://cdn.prod.website-files.com/627e806eabdfa0abab967259/62e2b0fba0640e7cda4039b9_o-pattern-L.svg — 200 — 25.9 KiB — 43 ms — h3https://cdn.prod.website-files.com/627e806eabdfa0abab967259/6388c2f01d41f52ae84c3079_Tucows-group-front-p-500.webpcdn.prod.website-files.com/627e806e... 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https://www.google-analytics.com/j/collect?v=1&_v=j102&a=846082365&t=pageview&_s=1&dl=https%3A%2F%2Ftucows.com%2F&ul=en-us&dt=Tucows%20%7C%20Making%20the%20Internet%20Better%20Since%201993&sr=800x600&vp=1350x940&_u=YADAAUABAAAAACAAI~&jid=268342350&gjid=344170720&cid=885305327.1776899683&tid=UA-1355090-32&_gid=323618684.1776899683&_r=1&_slc=1&gtm=45He64m0h2n81M9SSF3Sv898450447za200zd898450447&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115616986~115938466~115938469~117266400&z=607181334 — 200 — 448 B — 19 ms — h2https://f.vimeocdn.com/js_opt/modules/utils/vuid.min.jsf.vimeocdn.com/js_opt/modules/utils... https://f.vimeocdn.com/js_opt/modules/utils/vuid.min.js — 200 — 1.1 KiB — 3 ms — h2https://i.vimeocdn.com/video/1448172134-1c333eeeb710e7d3d1d9c7a74d99256498dac3b224ea5e596ce0a21f6a2544ed-d?mw=600&mh=338i.vimeocdn.com/video/1448172134-1c3... https://i.vimeocdn.com/video/1448172134-1c333eeeb710e7d3d1d9c7a74d99256498dac3b224ea5e596ce0a21f6a2544ed-d?mw=600&mh=338 — 200 — 12.8 KiB — 9 ms — h2https://www.gstatic.com/cv/js/sender/v1/cast_sender.js?loadCastFramework=1www.gstatic.com/cv/js/sender/v1/cas... https://www.gstatic.com/cv/js/sender/v1/cast_sender.js?loadCastFramework=1 — 200 — 2.5 KiB — 38 ms — h2https://arclight.vimeo.com/add/player-stats?beacon=1&session-id=1338f743ac6e8e99b2e28fbd4aa96c24379993d61776899682arclight.vimeo.com/add/player-stats... https://arclight.vimeo.com/add/player-stats?beacon=1&session-id=1338f743ac6e8e99b2e28fbd4aa96c24379993d61776899682 — 200 — 142 B — 53 ms — h2https://px.ads.linkedin.com/wa/?medium=fetch&fmt=gpx.ads.linkedin.com/wa/?medium=fetc... https://px.ads.linkedin.com/wa/?medium=fetch&fmt=g — 204 — 43 B — 33 ms — h3https://cdn.prod.website-files.com/627e806eabdfa0abab967259/6297c6946cf48f3d76490217_tucows-favicon.jpgcdn.prod.website-files.com/627e806e... https://cdn.prod.website-files.com/627e806eabdfa0abab967259/6297c6946cf48f3d76490217_tucows-favicon.jpg — 200 — 3.0 KiB — 10 ms — h3https://www.gstatic.com/cast/sdk/libs/sender/1.0/cast_framework.jswww.gstatic.com/cast/sdk/libs/sende... https://www.gstatic.com/cast/sdk/libs/sender/1.0/cast_framework.js — 200 — 12.2 KiB — 25 ms — h2https://www.gstatic.com/eureka/clank/146/cast_sender.jswww.gstatic.com/eureka/clank/146/ca... https://www.gstatic.com/eureka/clank/146/cast_sender.js — 200 — 13.4 KiB — 7 ms — h2https://orion.bendingspoons.com/v3/identity/settingsorion.bendingspoons.com/v3/identity... https://orion.bendingspoons.com/v3/identity/settings — 200 — 0 B — 66 ms — h2https://orion.bendingspoons.com/v3/identity/settingsorion.bendingspoons.com/v3/identity... https://orion.bendingspoons.com/v3/identity/settings — 200 — 455 B — 44 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
56% of JavaScript execution is third-party
First-party Third-party 285ms · 176KB · €3/mo
Unattributable
Other
Optional
Execution 89ms
Transfer 0 KB
Monthly Cost €1/mo
cdn.prod.website-files.com
Other
Optional
Execution 79ms
Transfer 49 KB
Monthly Cost €1/mo
cdn.prod.website-files.com
Other
Optional
Execution 66ms
Transfer 1 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 51ms
Transfer 125 KB
Unused 53%
Monthly Cost €1/mo

56% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

53% of Google Tag Manager'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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