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https://rs-online.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
84
GRADE
B
FIX
3
REVIEW
4
PASS
6
INFO
2

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

Mobile Desktop
95
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
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.
83
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.

910 ms

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

1.35 s

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

41 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.

910 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.

1.35 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
6 PASS 4 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
13 scripts, 151 KB unused
FIX
13 scripts, 151 KB unused
Warning::
https://nexus.ensighten.com/rscomponents/responsiv...: 51 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://nexus.ensighten.com/rscomponents/responsiv...: 40 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://nexus.ensighten.com/rscomponents/responsiv...: unminified — 16 KB could be saved
Warning::
https://www.rs-online.com/dN6dG-/jnoZ2_/dXYyE2/_Y-...: 37 KB unused (21%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://s.salecycle.com/rscomponentsuk/bundle.js: 24 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 151 KB
151 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://nexus.ensighten.com/rscomponents/responsiveprod/Bootstrap.js137 KB51 KB (37%)✓3rd
https://nexus.ensighten.com/rscomponents/responsiveprod/code/b2d7f94f4c6c218a9eb79afb5312c9d0.js?conditionId0=42304055 KB40 KB (73%)✗3rd
https://www.rs-online.com/dN6dG-/jnoZ2_/dXYyE2/_Y-tZl/OJ7Em4VpJtScS8uaiY/ZXVGCTE/eHsUZ/ixsaAoC175 KB37 KB (21%)✓3rd
https://s.salecycle.com/rscomponentsuk/bundle.js32 KB24 KB (75%)✓3rd
https://nexus.ensighten.com/rscomponents/responsiveprod/serverComponent.php?namespace=Bootstrapper&staticJsPath=nexus.ensighten.com/rscomponents/responsiveprod/code/&publishedOn=Mon%20Apr%2020%2014:35:08%20GMT%202026&ClientID=1626&PageID=https%3A%2F%2Fwww.rs-online.com%2F%3Fpage_type%3DRoot%20Domain%26pageName%3DRoot%20Domain%26site_section%3DRoot%20Domain%26site_section2%3Dundefined%26site_section3%3Dundefined%26supplier_brand%3Dundefined%26site_market%3Drootdomain%26referrer%3D%26registration_success%3Dundefined%26ppc%3D0%26mobile%3Ddesktop%26Advertising%3Dundefined%26Functionality%3Dundefined%26Recommendations_and_testing%3Dundefined%26Analytics%3Dundefined1 KB—✓3rd
https://tags.tiqcdn.com/utag/rs.components/rs-emea/prod/utag.v.js?a=rs.components/rs-emea/202604041733&cb=17768118505910 KB—✓3rd
https://tags.tiqcdn.com/utag/rs.components/rs-emea/prod/utag.js23 KB—✓3rd
https://nexus.ensighten.com/rscomponents/responsiveprod/code/3577074961fe5d8f56db2d128a3d56ae.js?conditionId0=48651953 KB—✓3rd
https://cdn.groupbycloud.com/gb-tracker-client-5.min.js41 KB—✓3rd
https://halc.iadvize.com/static/livechat/d4a644bbcdac43e259121b28c0cad8df42a95d3b/live.js16 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

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, 42 requests
REVIEW
1.2 MB transferred, 42 requests
Info::
Page weighs 2.9 MB (1.2 MB transferred)
Info::
42 HTTP requests
Info::
Estimated 0.25 g CO2 per page load
1.2 MB / 2.4 MB budget
1.2 MB transferred
42 requests
0.25 g CO2 per page load
Images 710.5 KiB 57%
JavaScript 491.5 KiB 40%
HTML 28.6 KiB 2%
Other 7.3 KiB 1%
Other 2.6 KiB 0%
CSS 1.2 KiB 0%
Fonts 0 B 0%
0 2.4 MB 4.9 MB
Under budget
B
Image Optimization
13 images, 0 KB saveable
REVIEW
13 images, 0 KB saveable
Warning::
https://media.rs-online.com/siteImages/rootDomain/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
13 images 710 KB
0 oversized -0 KB
13 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

C
Page Weight Inventory
Action
42 resources · 1.2 MB · 151 KB savings available
REVIEW
42 resources · 1.2 MB · 151 KB savings available
Warning::
Page weight 218 KB over 1MB target
Got: 1.2 MB Expected: ≤ 1 MB
Info::
~151 KB of savings available
Warning::
41 third-party resources (100% of weight)
Info::
1 resources over 200KB
42 resources · 1.2 MiB · 41 third-party 217.6 KiB over 1MB target
Image 57% · 713.6 KiB
JavaScript 40% · 491.5 KiB
Document 2% · 29.5 KiB
Other 0% · 5.8 KiB
CSS 0% · 1.2 KiB
Font 0% · 0 B

~151.1 KiB of savings available

Remove unused JavaScript: 151.1 KiB
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+
JS Execution Cost
427ms total JS execution
PASS
427ms total JS execution
Info::
https://www.rs-online.com/dN6dG-/jnoZ2_/dXYyE2/_Y-...: 160ms CPU time
Info::
https://nexus.ensighten.com/rscomponents/responsiv...: 141ms CPU time
Info::
https://www.rs-online.com/: 67ms CPU time
Info::
Unattributable: 59ms CPU time
Warning::
Third-party scripts: 427ms (100% of total)

Main Thread Breakdown

Script Evaluation 64% Other 14% Script Parsing & Compilation 9% Style & Layout 8%
ScriptTotalScriptingParse/CompileParty
https://www.rs-online.com/dN6dG-/jnoZ2_/dXYyE2/_Y-tZl/OJ7Em4VpJtScS8uaiY/ZXVGCTE/eHsUZ/ixsaAoC160ms145ms12ms3rd
https://nexus.ensighten.com/rscomponents/responsiveprod/Bootstrap.js141ms109ms16ms3rd
https://www.rs-online.com/67ms2ms1ms3rd
Unattributable59ms7ms0ms3rd
A+
Font Loading
2 fonts (0 KB)
PASS
2 fonts (0 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

0 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 910 ms LCP 1.4 shttps://uk.rs-online.com/static/fonts/notosans/v39/o-0bIpQlx3QUlC5A4PNB6Ryti20_6n1iPHjc5a7du3mhPy0.woff2o-0bIpQlx3QUlC5A4PNB6Ry... https://uk.rs-online.com/static/fonts/notosans/v39/o-0bIpQlx3QUlC5A4PNB6Ryti20_6n1iPHjc5a7du3mhPy0.woff2 — 0 B — 111 ms — font-display: swaphttps://uk.rs-online.com/static/fonts/oswald/v53/TK3iWkUHHAIjg752GT8Gl-1PKw.woff2TK3iWkUHHAIjg752GT8Gl-1... https://uk.rs-online.com/static/fonts/oswald/v53/TK3iWkUHHAIjg752GT8Gl-1PKw.woff2 — 0 B — 92 ms — font-display: swap
o-0bIpQlx3QUlC5A4PNB6Ry... woff2 swap
Size 0 KB
Load time 111 ms
Start 382 ms
Risk FOUT — text flashes from fallback to web font
TK3iWkUHHAIjg752GT8Gl-1... woff2 swap
Size 0 KB
Load time 92 ms
Start 382 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)
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
42 requests over 2774ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 910 ms LCP 1.4 shttps://rs-online.com// https://rs-online.com/ — 301 — 196 B — 33 ms — http/1.1https://www.rs-online.com/www.rs-online.com/ https://www.rs-online.com/ — 200 — 28.6 KiB — 52 ms — http/1.1https://media.rs-online.com/siteImages/rootDomain/hero-image.pngmedia.rs-online.com/siteImages/root... https://media.rs-online.com/siteImages/rootDomain/hero-image.png — 200 — 288.4 KiB — 25 ms — h2https://media.rs-online.com/siteImages/footer/facebook.svgmedia.rs-online.com/siteImages/foot... https://media.rs-online.com/siteImages/footer/facebook.svg — 200 — 544 B — 14 ms — h2https://uk.rs-online.com/static/fonts/ion-fonts.cssuk.rs-online.com/static/fonts/ion-f... https://uk.rs-online.com/static/fonts/ion-fonts.css — 200 — 1.2 KiB — 112 ms — h2https://nexus.ensighten.com/rscomponents/responsiveprod/Bootstrap.jsnexus.ensighten.com/rscomponents/re... https://nexus.ensighten.com/rscomponents/responsiveprod/Bootstrap.js — 200 — 136.8 KiB — 43 ms — h3https://media.rs-online.com/siteImages/footer/twitter.svgmedia.rs-online.com/siteImages/foot... https://media.rs-online.com/siteImages/footer/twitter.svg — 200 — 562 B — 17 ms — h2https://media.rs-online.com/siteImages/footer/linkedin.svgmedia.rs-online.com/siteImages/foot... https://media.rs-online.com/siteImages/footer/linkedin.svg — 200 — 635 B — 12 ms — h2https://media.rs-online.com/siteImages/footer/youtube.svgmedia.rs-online.com/siteImages/foot... https://media.rs-online.com/siteImages/footer/youtube.svg — 200 — 359 B — 6 ms — h2https://www.rs-online.com/dN6dG-/jnoZ2_/dXYyE2/_Y-tZl/OJ7Em4VpJtScS8uaiY/ZXVGCTE/eHsUZ/ixsaAoCwww.rs-online.com/dN6dG-/jnoZ2_/dXY... https://www.rs-online.com/dN6dG-/jnoZ2_/dXYyE2/_Y-tZl/OJ7Em4VpJtScS8uaiY/ZXVGCTE/eHsUZ/ixsaAoC — 200 — 175.0 KiB — 24 ms — http/1.1https://media.rs-online.com/siteImages/footer/instagram.svgmedia.rs-online.com/siteImages/foot... https://media.rs-online.com/siteImages/footer/instagram.svg — 200 — 523 B — 3 ms — h2https://media.rs-online.com/siteImages/footer/tiktok.svgmedia.rs-online.com/siteImages/foot... https://media.rs-online.com/siteImages/footer/tiktok.svg — 200 — 1.8 KiB — 3 ms — h2https://tags.tiqcdn.com/utag/rs.components/rs-emea/prod/utag.jstags.tiqcdn.com/utag/rs.components/... https://tags.tiqcdn.com/utag/rs.components/rs-emea/prod/utag.js — 200 — 22.9 KiB — 11 ms — h2https://s.salecycle.com/rscomponentsuk/bundle.jss.salecycle.com/rscomponentsuk/bund... https://s.salecycle.com/rscomponentsuk/bundle.js — 200 — 31.9 KiB — 9 ms — h2https://uk.rs-online.com/rsDesktopLogo.jpguk.rs-online.com/rsDesktopLogo.jpg https://uk.rs-online.com/rsDesktopLogo.jpg — 200 — 20.9 KiB — 17 ms — h2https://www.rs-online.com/DX-Analytics/error/e.gif?msg=Cannot%20read%20properties%20of%20null%20(reading%20%27addEventListener%27)&lnn=-1&fn=&cid=1626&client=rscomponents&publishPath=responsiveprod&rid=4240642&did=509528&errorName=TypeErrorwww.rs-online.com/DX-Analytics/erro... https://www.rs-online.com/DX-Analytics/error/e.gif?msg=Cannot%20read%20properties%20of%20null%20(reading%20%27addEventListener%27)&lnn=-1&fn=&cid=1626&client=rscomponents&publishPath=responsiveprod&rid=4240642&did=509528&errorName=TypeError — 301 — 386 B — 95 ms — http/1.1https://nexus.ensighten.com/rscomponents/responsiveprod/serverComponent.php?namespace=Bootstrapper&staticJsPath=nexus.ensighten.com/rscomponents/responsiveprod/code/&publishedOn=Mon%20Apr%2020%2014:35:08%20GMT%202026&ClientID=1626&PageID=https%3A%2F%2Fwww.rs-online.com%2F%3Fpage_type%3DRoot%20Domain%26pageName%3DRoot%20Domain%26site_section%3DRoot%20Domain%26site_section2%3Dundefined%26site_section3%3Dundefined%26supplier_brand%3Dundefined%26site_market%3Drootdomain%26referrer%3D%26registration_success%3Dundefined%26ppc%3D0%26mobile%3Ddesktop%26Advertising%3Dundefined%26Functionality%3Dundefined%26Recommendations_and_testing%3Dundefined%26Analytics%3Dundefinednexus.ensighten.com/rscomponents/re... https://nexus.ensighten.com/rscomponents/responsiveprod/serverComponent.php?namespace=Bootstrapper&staticJsPath=nexus.ensighten.com/rscomponents/responsiveprod/code/&publishedOn=Mon%20Apr%2020%2014:35:08%20GMT%202026&ClientID=1626&PageID=https%3A%2F%2Fwww.rs-online.com%2F%3Fpage_type%3DRoot%20Domain%26pageName%3DRoot%20Domain%26site_section%3DRoot%20Domain%26site_section2%3Dundefined%26site_section3%3Dundefined%26supplier_brand%3Dundefined%26site_market%3Drootdomain%26referrer%3D%26registration_success%3Dundefined%26ppc%3D0%26mobile%3Ddesktop%26Advertising%3Dundefined%26Functionality%3Dundefined%26Recommendations_and_testing%3Dundefined%26Analytics%3Dundefined — 200 — 999 B — 38 ms — h3https://www.rs-online.com/dN6dG-/jnoZ2_/dXYyE2/_Y-tZl/OJ7Em4VpJtScS8uaiY/ZXVGCTE/eHsUZ/ixsaAoCwww.rs-online.com/dN6dG-/jnoZ2_/dXY... https://www.rs-online.com/dN6dG-/jnoZ2_/dXYyE2/_Y-tZl/OJ7Em4VpJtScS8uaiY/ZXVGCTE/eHsUZ/ixsaAoC — 201 — 1.3 KiB — 184 ms — http/1.1https://www.rs-online.com/?msg=Cannot%20read%20properties%20of%20null%20(reading%20%27addEventListener%27)&lnn=-1&fn=&cid=1626&client=rscomponents&publishPath=responsiveprod&rid=4240642&did=509528&errorName=TypeErrorwww.rs-online.com/?msg=Cannot%20rea... https://www.rs-online.com/?msg=Cannot%20read%20properties%20of%20null%20(reading%20%27addEventListener%27)&lnn=-1&fn=&cid=1626&client=rscomponents&publishPath=responsiveprod&rid=4240642&did=509528&errorName=TypeError — 200 — 124.7 KiB — 28 ms — http/1.1https://uk.rs-online.com/static/fonts/notosans/v39/o-0bIpQlx3QUlC5A4PNB6Ryti20_6n1iPHjc5a7du3mhPy0.woff2uk.rs-online.com/static/fonts/notos... https://uk.rs-online.com/static/fonts/notosans/v39/o-0bIpQlx3QUlC5A4PNB6Ryti20_6n1iPHjc5a7du3mhPy0.woff2 — -1 — 0 B — 111 ms — https://uk.rs-online.com/static/fonts/oswald/v53/TK3iWkUHHAIjg752GT8Gl-1PKw.woff2uk.rs-online.com/static/fonts/oswal... https://uk.rs-online.com/static/fonts/oswald/v53/TK3iWkUHHAIjg752GT8Gl-1PKw.woff2 — -1 — 0 B — 92 ms — https://www.rs-online.com/privacy/v1/b/r.rnc?n=0&c=1626&i=574bdf&p=responsiveprod&s=340&d=8FB7InZlcnNpb24iOiIxLjAuMCIsImdhdGV3YXkiOiIyLjMuNjAxIiwiY2xpZW50SWQiOjE2MjYsInB1Ymxpc2hQYXRoIjoicmVzcG9uc2l2ZXByb2QiLCJpbnN0YW5jZTEA8BQiNTc0YmRmIiwicGFja2V0IjowLCJtb2RlIjoiZW5mb3JjZWEA8Ahvb2tpZXMiOnt9LCJlbnZpcm9ubWVudF4A8hJvb3Rkb21haW4iLCJyZXF1ZXN0cyI6W3siZGVzdGluYXTAAGAiLCJ0eXBXAPAPYmlsbGluZyIsInN0YXJ0IjoxNzc2ODExODUwNTQ3YACgZCI6LTEsInNvdX8AIjoiKwBBdHVzIgwAYHJlYXNvbmUA1F0sImRhdGFQYXR0ZXISALBsaXN0IjpbXSwiaRIB8AA3NzY4MTE4NTA1NDd9XX0www.rs-online.com/privacy/v1/b/r.rn... https://www.rs-online.com/privacy/v1/b/r.rnc?n=0&c=1626&i=574bdf&p=responsiveprod&s=340&d=8FB7InZlcnNpb24iOiIxLjAuMCIsImdhdGV3YXkiOiIyLjMuNjAxIiwiY2xpZW50SWQiOjE2MjYsInB1Ymxpc2hQYXRoIjoicmVzcG9uc2l2ZXByb2QiLCJpbnN0YW5jZTEA8BQiNTc0YmRmIiwicGFja2V0IjowLCJtb2RlIjoiZW5mb3JjZWEA8Ahvb2tpZXMiOnt9LCJlbnZpcm9ubWVudF4A8hJvb3Rkb21haW4iLCJyZXF1ZXN0cyI6W3siZGVzdGluYXTAAGAiLCJ0eXBXAPAPYmlsbGluZyIsInN0YXJ0IjoxNzc2ODExODUwNTQ3YACgZCI6LTEsInNvdX8AIjoiKwBBdHVzIgwAYHJlYXNvbmUA1F0sImRhdGFQYXR0ZXISALBsaXN0IjpbXSwiaRIB8AA3NzY4MTE4NTA1NDd9XX0 — 301 — 677 B — 14 ms — http/1.1https://www.rs-online.com/privacy/v1/c/r.rnc?n=0&c=1626&i=54kaz2&p=responsiveprod&s=445&d=9Cd7InZlcnNpb24iOiIxLjAuMCIsImdhdGV3YXkiOiIyLjMuNjAxIiwiY2xpZW50SWQiOjE2MjYQAPASTmFtZSI6InJzY29tcG9uZW50cyIsInB1Ymxpc2hQYXRoHQDwBGVzcG9uc2l2ZXByb2QiLCJtb2Q1AJB3aGl0ZWxpc3ReAPAnb29raWVzIjp7IlJTQ09NUE9ORU5UU19FTlNJR0hURU5fUFJJVkFDWV9CQU5ORVJfTE9BREVEtADxDyJ9LCJkdCI6MTc3NjgxMTg1MDU1OSwic2V0dGluZ1MA8BFtb2RhbCI6ImVudGVycHJpc2UiLCJlbnZpcm9ubWVudKUA8QRvb3Rkb21haW4iLCJkZWZhdWx0PADwDUZ1bmN0aW9uYWxpdHkiOjAsIlJlY29tbWVuZGEYAJBzIGFuZCBUZXNuAAEgALJBZHZlcnRpc2luZxAA8QJuYWx5dGljcyI6MH19LCJldicBMjpbewsAQSI6ImP_AGBDaGFuZ2UiAQvQAEU2MCwi-ADAQURFRCI6IjEifV19www.rs-online.com/privacy/v1/c/r.rn... 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https://www.rs-online.com/?n=0&c=1626&i=54kaz2&p=responsiveprod&s=445&d=9Cd7InZlcnNpb24iOiIxLjAuMCIsImdhdGV3YXkiOiIyLjMuNjAxIiwiY2xpZW50SWQiOjE2MjYQAPASTmFtZSI6InJzY29tcG9uZW50cyIsInB1Ymxpc2hQYXRoHQDwBGVzcG9uc2l2ZXByb2QiLCJtb2Q1AJB3aGl0ZWxpc3ReAPAnb29raWVzIjp7IlJTQ09NUE9ORU5UU19FTlNJR0hURU5fUFJJVkFDWV9CQU5ORVJfTE9BREVEtADxDyJ9LCJkdCI6MTc3NjgxMTg1MDU1OSwic2V0dGluZ1MA8BFtb2RhbCI6ImVudGVycHJpc2UiLCJlbnZpcm9ubWVudKUA8QRvb3Rkb21haW4iLCJkZWZhdWx0PADwDUZ1bmN0aW9uYWxpdHkiOjAsIlJlY29tbWVuZGEYAJBzIGFuZCBUZXNuAAEgALJBZHZlcnRpc2luZxAA8QJuYWx5dGljcyI6MH19LCJldicBMjpbewsAQSI6ImP_AGBDaGFuZ2UiAQvQAEU2MCwi-ADAQURFRCI6IjEifV19 — 200 — 124.7 KiB — 17 ms — http/1.1https://tags.tiqcdn.com/utag/rs.components/rs-emea/prod/utag.v.js?a=rs.components/rs-emea/202604041733&cb=1776811850591tags.tiqcdn.com/utag/rs.components/... https://tags.tiqcdn.com/utag/rs.components/rs-emea/prod/utag.v.js?a=rs.components/rs-emea/202604041733&cb=1776811850591 — 200 — 441 B — 5 ms — h2https://nexus.ensighten.com/rscomponents/responsiveprod/code/b2d7f94f4c6c218a9eb79afb5312c9d0.js?conditionId0=423040nexus.ensighten.com/rscomponents/re... https://nexus.ensighten.com/rscomponents/responsiveprod/code/b2d7f94f4c6c218a9eb79afb5312c9d0.js?conditionId0=423040 — 200 — 55.3 KiB — 11 ms — h3https://nexus.ensighten.com/rscomponents/responsiveprod/code/3577074961fe5d8f56db2d128a3d56ae.js?conditionId0=4865195nexus.ensighten.com/rscomponents/re... https://nexus.ensighten.com/rscomponents/responsiveprod/code/3577074961fe5d8f56db2d128a3d56ae.js?conditionId0=4865195 — 200 — 3.0 KiB — 10 ms — h3https://www.rs-online.com/DX-Analytics/error/e.gif?msg=%22ReferenceError%3A%20%24%20is%20not%20defined%22%20error%20caught%20in%20Data%20Definition%20extractor%3A%20Cart%20data%20layer%20population%2C%20ID%3A54276.&lnn=-1&fn=&cid=1626&client=rscomponents&publishPath=responsiveprod&rid=-1&did=-1&errorName=DataDefinitionExceptionwww.rs-online.com/DX-Analytics/erro... https://www.rs-online.com/DX-Analytics/error/e.gif?msg=%22ReferenceError%3A%20%24%20is%20not%20defined%22%20error%20caught%20in%20Data%20Definition%20extractor%3A%20Cart%20data%20layer%20population%2C%20ID%3A54276.&lnn=-1&fn=&cid=1626&client=rscomponents&publishPath=responsiveprod&rid=-1&did=-1&errorName=DataDefinitionException — 301 — 475 B — 18 ms — http/1.1https://cdn.groupbycloud.com/gb-tracker-client-5.min.jscdn.groupbycloud.com/gb-tracker-cli... https://cdn.groupbycloud.com/gb-tracker-client-5.min.js — 200 — 40.9 KiB — 78 ms — h2https://www.rs-online.com/?msg=%22ReferenceError%3A%20%24%20is%20not%20defined%22%20error%20caught%20in%20Data%20Definition%20extractor%3A%20Cart%20data%20layer%20population%2C%20ID%3A54276.&lnn=-1&fn=&cid=1626&client=rscomponents&publishPath=responsiveprod&rid=-1&did=-1&errorName=DataDefinitionExceptionwww.rs-online.com/?msg=%22Reference... https://www.rs-online.com/?msg=%22ReferenceError%3A%20%24%20is%20not%20defined%22%20error%20caught%20in%20Data%20Definition%20extractor%3A%20Cart%20data%20layer%20population%2C%20ID%3A54276.&lnn=-1&fn=&cid=1626&client=rscomponents&publishPath=responsiveprod&rid=-1&did=-1&errorName=DataDefinitionException — 200 — 11.3 KiB — 21 ms — http/1.1https://labs.iadvize.com/scripts/loader.jslabs.iadvize.com/scripts/loader.js https://labs.iadvize.com/scripts/loader.js — 302 — 134 B — 100 ms — h2https://halc.iadvize.com/iadvize.js?lang=undefinedhalc.iadvize.com/iadvize.js?lang=un... https://halc.iadvize.com/iadvize.js?lang=undefined — 302 — 390 B — 11 ms — h3https://rsgroup.com/assets/img/icons/favicon.icorsgroup.com/assets/img/icons/favico... https://rsgroup.com/assets/img/icons/favicon.ico — 301 — 393 B — 129 ms — h2https://halc.iadvize.com/static/livechat/d4a644bbcdac43e259121b28c0cad8df42a95d3b/live.jshalc.iadvize.com/static/livechat/d4... https://halc.iadvize.com/static/livechat/d4a644bbcdac43e259121b28c0cad8df42a95d3b/live.js — 200 — 16.3 KiB — 4 ms — h3https://labs.iadvize.com/scripts/iAdvizeLabs.84f607.jslabs.iadvize.com/scripts/iAdvizeLab... https://labs.iadvize.com/scripts/iAdvizeLabs.84f607.js — 200 — 4.8 KiB — 35 ms — h2https://www.rsgroup.com/assets/img/icons/favicon.icowww.rsgroup.com/assets/img/icons/fa... https://www.rsgroup.com/assets/img/icons/favicon.ico — 200 — 3.1 KiB — 61 ms — h3https://labs.iadvize.com/scripts/plugin-split-index.2ea8b9.jslabs.iadvize.com/scripts/plugin-spl... https://labs.iadvize.com/scripts/plugin-split-index.2ea8b9.js — 200 — 3.2 KiB — 34 ms — h2blob:https://www.rs-online.com/41144dfb-3204-40a2-9155-0939454468e6www.rs-online.com/41144dfb-3204-40a... blob:https://www.rs-online.com/41144dfb-3204-40a2-9155-0939454468e6 — -1 — 0 B — 0 ms — https://www.rs-online.com/dN6dG-/jnoZ2_/dXYyE2/_Y-tZl/OJ7Em4VpJtScS8uaiY/ZXVGCTE/eHsUZ/ixsaAoCwww.rs-online.com/dN6dG-/jnoZ2_/dXY... https://www.rs-online.com/dN6dG-/jnoZ2_/dXYyE2/_Y-tZl/OJ7Em4VpJtScS8uaiY/ZXVGCTE/eHsUZ/ixsaAoC — 201 — 1.3 KiB — 212 ms — http/1.1https://www.rs-online.com/privacy/v1/b/r.rnc?n=1&c=1626&i=574bdf&p=responsiveprod&s=451&d=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.rs-online.com/privacy/v1/b/r.rn... https://www.rs-online.com/privacy/v1/b/r.rnc?n=1&c=1626&i=574bdf&p=responsiveprod&s=451&d=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 — 301 — 813 B — 11 ms — http/1.1https://www.rs-online.com/?n=1&c=1626&i=574bdf&p=responsiveprod&s=451&d=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.rs-online.com/?n=1&c=1626&i=574... https://www.rs-online.com/?n=1&c=1626&i=574bdf&p=responsiveprod&s=451&d=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 — 200 — 11.3 KiB — 14 ms — http/1.1
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 427ms · 167KB · £4/mo
www.rs-online.com
Other
Optional
Execution 160ms
Transfer 1 KB
Unused 21%
Monthly Cost £2/mo
nexus.ensighten.com
Other
Optional
Execution 141ms
Transfer 137 KB
Unused 37%
Monthly Cost £1/mo
www.rs-online.com
Other
Optional
Execution 67ms
Transfer 29 KB
Monthly Cost £1/mo
Unattributable
Other
Optional
Execution 59ms
Transfer 0 KB
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

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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