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https://rs-online.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
84
GRADE
B
FIX
3
REVIEW
3
PASS
9
INFO
2

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

Mobile Desktop
63
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.

3.31 s

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

6.02 s

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

366 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.

3.31 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.

6.69 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
17
9 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 (997.1 KiB of 997.2 KiB)
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...: 52 KB unused (38%)
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-...: 36 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 KB52 KB (38%)✓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/ixsaAoC170 KB36 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%3Dmobile%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=17768118290490 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
Image Optimization
12 images, 0 KB saveable
REVIEW
12 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.
12 images 472 KB
0 oversized -0 KB
12 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
JS Execution Cost
Action
1911ms total JS execution
REVIEW
1911ms total JS execution
Warning::
https://www.rs-online.com/dN6dG-/jnoZ2_/dXYyE2/_Y-...: 783ms CPU time
Warning::
https://nexus.ensighten.com/rscomponents/responsiv...: 509ms CPU time
Warning::
Unattributable: 274ms CPU time
Info::
https://www.rs-online.com/: 157ms CPU time
Info::
https://nexus.ensighten.com/rscomponents/responsiv...: 118ms CPU time
Warning::
Third-party scripts: 1911ms (100% of total)

Main Thread Breakdown

Script Evaluation 64% Other 15% Script Parsing & Compilation 8% Style & Layout 7% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.rs-online.com/dN6dG-/jnoZ2_/dXYyE2/_Y-tZl/OJ7Em4VpJtScS8uaiY/ZXVGCTE/eHsUZ/ixsaAoC783ms632ms40ms3rd
https://nexus.ensighten.com/rscomponents/responsiveprod/Bootstrap.js509ms390ms64ms3rd
Unattributable274ms28ms0ms3rd
https://www.rs-online.com/157ms8ms2ms3rd
https://nexus.ensighten.com/rscomponents/responsiveprod/code/b2d7f94f4c6c218a9eb79afb5312c9d0.js?conditionId0=423040118ms89ms28ms3rd
https://tags.tiqcdn.com/utag/rs.components/rs-emea/prod/utag.js70ms62ms7ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Page Weight Budget
997 KB transferred, 40 requests
PASS
997 KB transferred, 40 requests
Info::
Page weighs 2.6 MB (997 KB transferred)
Info::
40 HTTP requests
Info::
Estimated 0.20 g CO2 per page load
997 KB / 2.4 MB budget
997 KB transferred
40 requests
0.20 g CO2 per page load
JavaScript 486.2 KiB 49%
Images 472.5 KiB 47%
HTML 28.6 KiB 3%
Other 6.2 KiB 1%
Other 2.5 KiB 0%
CSS 1.2 KiB 0%
Fonts 0 B 0%
0 2.4 MB 4.9 MB
Under budget
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
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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 3.3 s LCP 6.0 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 — 121 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 — 116 ms — font-display: swap
o-0bIpQlx3QUlC5A4PNB6Ry... woff2 swap
Size 0 KB
Load time 121 ms
Start 356 ms
Risk FOUT — text flashes from fallback to web font
TK3iWkUHHAIjg752GT8Gl-1... woff2 swap
Size 0 KB
Load time 116 ms
Start 356 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
7 hints, 0 missing preconnects
PASS
7 hints, 0 missing preconnects
Info::
Page uses 7 resource hint(s)

Current Resource Hints

preconnect
—
preload
7
dns-prefetch
—
prefetch
—

7 resource hints configured

A
Page Weight Inventory
40 resources · 997 KB · 151 KB savings available
PASS
40 resources · 997 KB · 151 KB savings available
Info::
Within 1MB page-weight target
Got: 997 KB
Info::
~151 KB of savings available
Warning::
39 third-party resources (100% of weight)
Info::
1 resources over 200KB
40 resources · 997.2 KiB · 39 third-party Within 1MB page-weight target
JavaScript 49% · 486.2 KiB
Image 48% · 475.0 KiB
Document 3% · 29.5 KiB
Other 1% · 5.4 KiB
CSS 0% · 1.2 KiB
Font 0% · 0 B

~151.4 KiB of savings available

Remove unused JavaScript: 151.4 KiB
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
40 requests over 2793ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 3.3 s LCP 6.0 shttps://rs-online.com// https://rs-online.com/ — 301 — 196 B — 9 ms — http/1.1https://www.rs-online.com/www.rs-online.com/ https://www.rs-online.com/ — 200 — 28.6 KiB — 45 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 — 288.3 KiB — 61 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 — 549 B — 53 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 — 140 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 — 57 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 — 50 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 — 765 B — 48 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 — 169.6 KiB — 15 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 — 527 B — 4 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 — 1.9 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 — 40 ms — h2https://s.salecycle.com/rscomponentsuk/bundle.jss.salecycle.com/rscomponentsuk/bund... https://s.salecycle.com/rscomponentsuk/bundle.js — 200 — 32.0 KiB — 39 ms — h2https://uk.rs-online.com/rsDesktopLogo.jpguk.rs-online.com/rsDesktopLogo.jpg https://uk.rs-online.com/rsDesktopLogo.jpg — 200 — 20.9 KiB — 14 ms — h2https://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%3Dmobile%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%3Dmobile%26Advertising%3Dundefined%26Functionality%3Dundefined%26Recommendations_and_testing%3Dundefined%26Analytics%3Dundefined — 200 — 1001 B — 41 ms — h3https://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 — 121 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 — 116 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 — 1.2 KiB — 189 ms — http/1.1https://www.rs-online.com/privacy/v1/b/r.rnc?n=0&c=1626&i=5hrmus&p=responsiveprod&s=340&d=8FB7InZlcnNpb24iOiIxLjAuMCIsImdhdGV3YXkiOiIyLjMuNjAxIiwiY2xpZW50SWQiOjE2MjYsInB1Ymxpc2hQYXRoIjoicmVzcG9uc2l2ZXByb2QiLCJpbnN0YW5jZTEA8BQiNWhybXVzIiwicGFja2V0IjowLCJtb2RlIjoiZW5mb3JjZWEA8Ahvb2tpZXMiOnt9LCJlbnZpcm9ubWVudF4A8hJvb3Rkb21haW4iLCJyZXF1ZXN0cyI6W3siZGVzdGluYXTAAGAiLCJ0eXBXAPAPYmlsbGluZyIsInN0YXJ0IjoxNzc2ODExODI5MDExYACgZCI6LTEsInNvdX8AIjoiKwBBdHVzIgwAYHJlYXNvbmUA1F0sImRhdGFQYXR0ZXISALBsaXN0IjpbXSwiaRIB8AA3NzY4MTE4MjkwMTF9XX0www.rs-online.com/privacy/v1/b/r.rn... https://www.rs-online.com/privacy/v1/b/r.rnc?n=0&c=1626&i=5hrmus&p=responsiveprod&s=340&d=8FB7InZlcnNpb24iOiIxLjAuMCIsImdhdGV3YXkiOiIyLjMuNjAxIiwiY2xpZW50SWQiOjE2MjYsInB1Ymxpc2hQYXRoIjoicmVzcG9uc2l2ZXByb2QiLCJpbnN0YW5jZTEA8BQiNWhybXVzIiwicGFja2V0IjowLCJtb2RlIjoiZW5mb3JjZWEA8Ahvb2tpZXMiOnt9LCJlbnZpcm9ubWVudF4A8hJvb3Rkb21haW4iLCJyZXF1ZXN0cyI6W3siZGVzdGluYXTAAGAiLCJ0eXBXAPAPYmlsbGluZyIsInN0YXJ0IjoxNzc2ODExODI5MDExYACgZCI6LTEsInNvdX8AIjoiKwBBdHVzIgwAYHJlYXNvbmUA1F0sImRhdGFQYXR0ZXISALBsaXN0IjpbXSwiaRIB8AA3NzY4MTE4MjkwMTF9XX0 — 301 — 677 B — 14 ms — http/1.1https://www.rs-online.com/privacy/v1/c/r.rnc?n=0&c=1626&i=8qb7fz&p=responsiveprod&s=445&d=9Cd7InZlcnNpb24iOiIxLjAuMCIsImdhdGV3YXkiOiIyLjMuNjAxIiwiY2xpZW50SWQiOjE2MjYQAPASTmFtZSI6InJzY29tcG9uZW50cyIsInB1Ymxpc2hQYXRoHQDwBGVzcG9uc2l2ZXByb2QiLCJtb2Q1AJB3aGl0ZWxpc3ReAPAnb29raWVzIjp7IlJTQ09NUE9ORU5UU19FTlNJR0hURU5fUFJJVkFDWV9CQU5ORVJfTE9BREVEtADxDyJ9LCJkdCI6MTc3NjgxMTgyOTAyMCwic2V0dGluZ1MA8BFtb2RhbCI6ImVudGVycHJpc2UiLCJlbnZpcm9ubWVudKUA8QRvb3Rkb21haW4iLCJkZWZhdWx0PADwDUZ1bmN0aW9uYWxpdHkiOjAsIlJlY29tbWVuZGEYAJBzIGFuZCBUZXNuAAEgALJBZHZlcnRpc2luZxAA8QJuYWx5dGljcyI6MH19LCJldicBMjpbewsAQSI6ImP_AGBDaGFuZ2UiAQ_QAAAF-ADAQURFRCI6IjEifV19www.rs-online.com/privacy/v1/c/r.rn... 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https://www.rs-online.com/?n=0&c=1626&i=8qb7fz&p=responsiveprod&s=445&d=9Cd7InZlcnNpb24iOiIxLjAuMCIsImdhdGV3YXkiOiIyLjMuNjAxIiwiY2xpZW50SWQiOjE2MjYQAPASTmFtZSI6InJzY29tcG9uZW50cyIsInB1Ymxpc2hQYXRoHQDwBGVzcG9uc2l2ZXByb2QiLCJtb2Q1AJB3aGl0ZWxpc3ReAPAnb29raWVzIjp7IlJTQ09NUE9ORU5UU19FTlNJR0hURU5fUFJJVkFDWV9CQU5ORVJfTE9BREVEtADxDyJ9LCJkdCI6MTc3NjgxMTgyOTAyMCwic2V0dGluZ1MA8BFtb2RhbCI6ImVudGVycHJpc2UiLCJlbnZpcm9ubWVudKUA8QRvb3Rkb21haW4iLCJkZWZhdWx0PADwDUZ1bmN0aW9uYWxpdHkiOjAsIlJlY29tbWVuZGEYAJBzIGFuZCBUZXNuAAEgALJBZHZlcnRpc2luZxAA8QJuYWx5dGljcyI6MH19LCJldicBMjpbewsAQSI6ImP_AGBDaGFuZ2UiAQ_QAAAF-ADAQURFRCI6IjEifV19 — 200 — 11.3 KiB — 18 ms — http/1.1https://tags.tiqcdn.com/utag/rs.components/rs-emea/prod/utag.v.js?a=rs.components/rs-emea/202604041733&cb=1776811829049tags.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=1776811829049 — 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 — 15 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 — 12 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... 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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 — 14 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 — 134 ms — h2https://halc.iadvize.com/iadvize.js?lang=undefinedhalc.iadvize.com/iadvize.js?lang=un... https://halc.iadvize.com/iadvize.js?lang=undefined — 302 — 391 B — 38 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 — 158 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 — 34 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 — 2.5 KiB — 95 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/81f914a7-d2b1-4ea4-9ae7-59bd9f21731awww.rs-online.com/81f914a7-d2b1-4ea... blob:https://www.rs-online.com/81f914a7-d2b1-4ea4-9ae7-59bd9f21731a — -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... 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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 1911ms · 245KB · £20/mo
www.rs-online.com
Other
Costly
Execution 783ms
Transfer 1 KB
Unused 21%
Monthly Cost £8/mo
nexus.ensighten.com
Other
Costly
Execution 509ms
Transfer 137 KB
Unused 38%
Monthly Cost £5/mo
Unattributable
Other
Costly
Execution 274ms
Transfer 0 KB
Monthly Cost £3/mo
www.rs-online.com
Other
Optional
Execution 157ms
Transfer 29 KB
Monthly Cost £2/mo
nexus.ensighten.com
Other
Optional
Execution 118ms
Transfer 55 KB
Unused 73%
Monthly Cost £1/mo
tags.tiqcdn.com
Other
Optional
Execution 70ms
Transfer 23 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.rs-online.com adds 783ms and costs ~£8/month
  • nexus.ensighten.com adds 509ms and costs ~£5/month
  • Unattributable adds 274ms 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.rs-online.com takes 783ms 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

nexus.ensighten.com takes 509ms 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 274ms 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

73% of nexus.ensighten.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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