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https://gsk.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
3
REVIEW
4
PASS
6
INFO
2

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

Mobile Desktop
87
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
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.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.07 s

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

1.29 s

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

103 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.

2.76 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.

2.60 s

Page Load Progression

734 ms
1.5 s
2.2 s
2.9 s
3.7 s
4.4 s
5.1 s
5.9 s
Checks
15
6 PASS 4 REVIEW 3 FIX
F
Page Weight Budget
Action
16.7 MB transferred, 118 requests
FIX
16.7 MB transferred, 118 requests
Critical::
Page weighs 19.4 MB (16.7 MB transferred)
Warning::
Images are 1.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.5 MB
Warning::
JavaScript is 773 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 773 KB
Info::
Fonts are 235 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 235 KB
Warning::
118 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 3.5 g CO2 per page load
16.7 MB / 2.4 MB budget
16.7 MB transferred
118 requests
3.5 g CO2 per page load
Other 14.0 MiB 84%
Images 1.5 MiB 9%
JavaScript 773.4 KiB 5%
Fonts 235.2 KiB 1%
HTML 112.0 KiB 1%
CSS 43.4 KiB 0%
Other 7.4 KiB 0%
Other 586 B 0%
Other 562 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

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 (16.6 MiB of 16.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
118 resources · 16.7 MB · 247 KB savings available
FIX
118 resources · 16.7 MB · 247 KB savings available
Warning::
Page weight 15.7 MB over 1MB target
Got: 16.7 MB Expected: ≤ 1 MB
Info::
~247 KB of savings available
Warning::
116 third-party resources (100% of weight)
Info::
5 resources over 200KB
118 resources · 16.7 MiB · 116 third-party 15.7 MiB over 1MB target
Media 84% · 14.0 MiB
Image 9% · 1.5 MiB
JavaScript 5% · 773.9 KiB
Font 1% · 235.2 KiB
Document 1% · 112.3 KiB
CSS 0% · 43.4 KiB
Other 0% · 1.7 KiB

~247.0 KiB of savings available

Remove unused JavaScript: 247.0 KiB
B
Image Optimization
30 images, 0 KB saveable
REVIEW
30 images, 0 KB saveable
Info::
All images are well-optimized
30 images 1.5 MB
0 oversized -0 KB
18 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1615ms total JS execution
REVIEW
1615ms total JS execution
Warning::
Unattributable: 591ms CPU time
Warning::
https://tags.tiqcdn.com/utag/gsk/profile-rx-gb/pro...: 388ms CPU time
Warning::
https://www.gsk.com/en-gb/: 289ms CPU time
Info::
https://www.gsk.com/_nuxt/BQyzoT6n.js: 122ms CPU time
Info::
https://www.gsk.com/_nuxt/DDlvirwQ.js: 108ms CPU time
Warning::
Third-party scripts: 1615ms (100% of total)

Main Thread Breakdown

Other 44% Script Evaluation 32% Style & Layout 12% Script Parsing & Compilation 5% Rendering 4%
ScriptTotalScriptingParse/CompileParty
Unattributable591ms37ms0ms3rd
https://tags.tiqcdn.com/utag/gsk/profile-rx-gb/prod/utag.js388ms293ms76ms3rd
https://www.gsk.com/en-gb/289ms33ms1ms3rd
https://www.gsk.com/_nuxt/BQyzoT6n.js122ms112ms0ms3rd
https://www.gsk.com/_nuxt/DDlvirwQ.js108ms7ms0ms3rd
https://www.gsk.com/_nuxt/D5-xqjRT.js60ms56ms0ms3rd
https://www.gsk.com/_nuxt/D17R7Lh8.js57ms6ms0ms3rd
C
JS Bundles
Action
48 scripts, 247 KB unused
REVIEW
48 scripts, 247 KB unused
Warning::
https://tags.tiqcdn.com/utag/gsk/profile-rx-gb/pro...: 151 KB unused (34%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js: 54 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gsk.com/_nuxt/BQyzoT6n.js: 42 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 247 KB
247 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://tags.tiqcdn.com/utag/gsk/profile-rx-gb/prod/utag.js447 KB151 KB (34%)✓3rd
https://www.googletagmanager.com/gtag/js85 KB54 KB (64%)✓3rd
https://www.gsk.com/_nuxt/BQyzoT6n.js104 KB42 KB (41%)✓3rd
https://www.gsk.com/_nuxt/BdevirBr.js1 KB—✓3rd
https://www.gsk.com/_nuxt/BECnRw6w.js3 KB—✓3rd
https://www.gsk.com/_nuxt/_v4gJJCl.js6 KB—✓3rd
https://www.gsk.com/_nuxt/DeHI1n72.js2 KB—✓3rd
https://www.gsk.com/_nuxt/DiLrbaPy.js1 KB—✓3rd
https://www.gsk.com/_nuxt/C0DmV8Vd.js1 KB—✓3rd
https://www.gsk.com/_nuxt/Dgt8XGRz.js1 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

B
HTTP Caching
public, max-age=0, max-stale=0, s-maxage=604800, stale-while-revalidate=5, must-revalidate, proxy-revalidate
REVIEW
public, max-age=0, max-stale=0, s-maxage=604800, stale-while-revalidate=5, must-revalidate, proxy-revalidate
Info::
Cache-Control header is set
Got: public, max-age=0, max-stale=0, s-maxage=604800, stale-while-revalidate=5, must-revalidate, proxy-revalidate
Info::
CDN TTL: 1 week (s-maxage=604800)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=0, max-stale=0, s-maxage=604800, stale-while-revalidate=5, must-revalidate, proxy-revalidate

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
max-stale0
s-maxage604800CDN caches for 1 week
stale-while-revalidate5Serve stale for 5 seconds while fetching fresh
must-revalidate—Must recheck with server after expiry
proxy-revalidate—
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
5 fonts (235 KB)
PASS
5 fonts (235 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

235 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 1.1 s LCP 1.3 shttps://www.gsk.com/nuxtassets/fonts/gsk-light.woffgsk-light.woff https://www.gsk.com/nuxtassets/fonts/gsk-light.woff — 59.5 KiB — 353 ms — font-display: swaphttps://www.gsk.com/nuxtassets/fonts/gsk-regular.woffgsk-regular.woff https://www.gsk.com/nuxtassets/fonts/gsk-regular.woff — 57.1 KiB — 399 ms — font-display: swaphttps://www.gsk.com/nuxtassets/fonts/gsk-bold.woffgsk-bold.woff https://www.gsk.com/nuxtassets/fonts/gsk-bold.woff — 57.3 KiB — 287 ms — font-display: swaphttps://www.gsk.com/nuxtassets/fonts/gsk-regularitalic.woffgsk-regularitalic.woff https://www.gsk.com/nuxtassets/fonts/gsk-regularitalic.woff — 56.8 KiB — 285 ms — font-display: swaphttps://www.gsk.com/nuxtassets/fonts/icons.woff?e79pkoicons.woff https://www.gsk.com/nuxtassets/fonts/icons.woff?e79pko — 4.5 KiB — 235 ms — font-display: swap
gsk-light.woff woff swap
Size 60 KB
Load time 353 ms
Start 616 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
gsk-regular.woff woff swap
Size 57 KB
Load time 399 ms
Start 617 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
gsk-bold.woff woff swap
Size 57 KB
Load time 287 ms
Start 617 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
gsk-regularitalic.woff woff swap
Size 57 KB
Load time 285 ms
Start 618 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
icons.woff woff swap
Size 5 KB
Load time 235 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~71 KB and ~142 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Google Cloud

Network Waterfall
118 requests over 4004ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.1 s LCP 1.3 shttps://gsk.com// https://gsk.com/ — 301 — 288 B — 151 ms — h2https://gsk.com/en-gb//en-gb/ https://gsk.com/en-gb/ — 301 — 1.1 KiB — 253 ms — h2https://www.gsk.com/en-gb/www.gsk.com/en-gb/ https://www.gsk.com/en-gb/ — 200 — 112.0 KiB — 202 ms — h2https://www.gsk.com/nuxtassets/fonts/fonts.csswww.gsk.com/nuxtassets/fonts/fonts.... https://www.gsk.com/nuxtassets/fonts/fonts.css — 200 — 352 B — 243 ms — h3https://www.gsk.com/_nuxt/entry.DFP45Lr9.csswww.gsk.com/_nuxt/entry.DFP45Lr9.cs... https://www.gsk.com/_nuxt/entry.DFP45Lr9.css — 200 — 3.8 KiB — 245 ms — h3https://www.gsk.com/_nuxt/swiper.CKPHODKt.csswww.gsk.com/_nuxt/swiper.CKPHODKt.c... https://www.gsk.com/_nuxt/swiper.CKPHODKt.css — 200 — 1.3 KiB — 218 ms — h3https://www.gsk.com/nuxtassets/fonts/gsk-light.woffwww.gsk.com/nuxtassets/fonts/gsk-li... https://www.gsk.com/nuxtassets/fonts/gsk-light.woff — 200 — 59.5 KiB — 353 ms — h3https://www.gsk.com/nuxtassets/fonts/gsk-regular.woffwww.gsk.com/nuxtassets/fonts/gsk-re... https://www.gsk.com/nuxtassets/fonts/gsk-regular.woff — 200 — 57.1 KiB — 399 ms — h3https://www.gsk.com/nuxtassets/fonts/gsk-bold.woffwww.gsk.com/nuxtassets/fonts/gsk-bo... https://www.gsk.com/nuxtassets/fonts/gsk-bold.woff — 200 — 57.3 KiB — 287 ms — h3https://www.gsk.com/nuxtassets/fonts/gsk-regularitalic.woffwww.gsk.com/nuxtassets/fonts/gsk-re... https://www.gsk.com/nuxtassets/fonts/gsk-regularitalic.woff — 200 — 56.8 KiB — 285 ms — h3https://www.gsk.com/_nuxt/BQyzoT6n.jswww.gsk.com/_nuxt/BQyzoT6n.js https://www.gsk.com/_nuxt/BQyzoT6n.js — 200 — 103.8 KiB — 763 ms — h3https://www.gsk.com/_nuxt/D5-xqjRT.jswww.gsk.com/_nuxt/D5-xqjRT.js https://www.gsk.com/_nuxt/D5-xqjRT.js — 200 — 7.8 KiB — 270 ms — h3https://www.gsk.com/_nuxt/BrrH8z0D.jswww.gsk.com/_nuxt/BrrH8z0D.js https://www.gsk.com/_nuxt/BrrH8z0D.js — 200 — 3.2 KiB — 292 ms — h3https://www.gsk.com/_nuxt/CB-xvtm1.jswww.gsk.com/_nuxt/CB-xvtm1.js https://www.gsk.com/_nuxt/CB-xvtm1.js — 200 — 288 B — 255 ms — h3https://www.gsk.com/_nuxt/CF-8EweR.jswww.gsk.com/_nuxt/CF-8EweR.js https://www.gsk.com/_nuxt/CF-8EweR.js — 200 — 774 B — 658 ms — h3https://www.gsk.com/_nuxt/_v4gJJCl.jswww.gsk.com/_nuxt/_v4gJJCl.js https://www.gsk.com/_nuxt/_v4gJJCl.js — 200 — 5.8 KiB — 298 ms — h3https://www.gsk.com/_nuxt/DeHI1n72.jswww.gsk.com/_nuxt/DeHI1n72.js https://www.gsk.com/_nuxt/DeHI1n72.js — 200 — 2.4 KiB — 258 ms — h3https://www.gsk.com/_nuxt/DiLrbaPy.jswww.gsk.com/_nuxt/DiLrbaPy.js https://www.gsk.com/_nuxt/DiLrbaPy.js — 200 — 841 B — 270 ms — h3https://www.gsk.com/_nuxt/C0DmV8Vd.jswww.gsk.com/_nuxt/C0DmV8Vd.js https://www.gsk.com/_nuxt/C0DmV8Vd.js — 200 — 524 B — 295 ms — h3https://www.gsk.com/_nuxt/Dgt8XGRz.jswww.gsk.com/_nuxt/Dgt8XGRz.js https://www.gsk.com/_nuxt/Dgt8XGRz.js — 200 — 658 B — 449 ms — h3https://www.gsk.com/_nuxt/B2k_FUN-.jswww.gsk.com/_nuxt/B2k_FUN-.js https://www.gsk.com/_nuxt/B2k_FUN-.js — 200 — 342 B — 268 ms — h3https://www.gsk.com/_nuxt/Cpm5ngHp.jswww.gsk.com/_nuxt/Cpm5ngHp.js https://www.gsk.com/_nuxt/Cpm5ngHp.js — 200 — 7.8 KiB — 290 ms — h3https://www.gsk.com/_nuxt/B6WfudZ9.jswww.gsk.com/_nuxt/B6WfudZ9.js https://www.gsk.com/_nuxt/B6WfudZ9.js — 200 — 283 B — 266 ms — h3https://www.gsk.com/_nuxt/DPqTioCl.jswww.gsk.com/_nuxt/DPqTioCl.js https://www.gsk.com/_nuxt/DPqTioCl.js — 200 — 953 B — 294 ms — h3https://www.gsk.com/_nuxt/zzE9AA-u.jswww.gsk.com/_nuxt/zzE9AA-u.js https://www.gsk.com/_nuxt/zzE9AA-u.js — 200 — 2.5 KiB — 293 ms — h3https://www.gsk.com/_nuxt/DCAsqUC5.jswww.gsk.com/_nuxt/DCAsqUC5.js https://www.gsk.com/_nuxt/DCAsqUC5.js — 200 — 2.3 KiB — 255 ms — h3https://www.gsk.com/_nuxt/DJ65BbbF.jswww.gsk.com/_nuxt/DJ65BbbF.js https://www.gsk.com/_nuxt/DJ65BbbF.js — 200 — 249 B — 654 ms — h3https://www.gsk.com/_nuxt/HgMEwF18.jswww.gsk.com/_nuxt/HgMEwF18.js https://www.gsk.com/_nuxt/HgMEwF18.js — 200 — 1.2 KiB — 216 ms — h3https://www.gsk.com/_nuxt/BECnRw6w.jswww.gsk.com/_nuxt/BECnRw6w.js https://www.gsk.com/_nuxt/BECnRw6w.js — 200 — 3.2 KiB — 284 ms — h3https://www.gsk.com/_nuxt/BWoE8uIw.jswww.gsk.com/_nuxt/BWoE8uIw.js https://www.gsk.com/_nuxt/BWoE8uIw.js — 200 — 1.6 KiB — 285 ms — h3
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.1 s LCP 1.3 shttps://gsk.com// https://gsk.com/ — 301 — 288 B — 151 ms — h2https://gsk.com/en-gb//en-gb/ https://gsk.com/en-gb/ — 301 — 1.1 KiB — 253 ms — h2https://www.gsk.com/en-gb/www.gsk.com/en-gb/ https://www.gsk.com/en-gb/ — 200 — 112.0 KiB — 202 ms — h2https://www.gsk.com/nuxtassets/fonts/fonts.csswww.gsk.com/nuxtassets/fonts/fonts.... https://www.gsk.com/nuxtassets/fonts/fonts.css — 200 — 352 B — 243 ms — h3https://www.gsk.com/_nuxt/entry.DFP45Lr9.csswww.gsk.com/_nuxt/entry.DFP45Lr9.cs... https://www.gsk.com/_nuxt/entry.DFP45Lr9.css — 200 — 3.8 KiB — 245 ms — h3https://www.gsk.com/_nuxt/swiper.CKPHODKt.csswww.gsk.com/_nuxt/swiper.CKPHODKt.c... https://www.gsk.com/_nuxt/swiper.CKPHODKt.css — 200 — 1.3 KiB — 218 ms — h3https://www.gsk.com/nuxtassets/fonts/gsk-light.woffwww.gsk.com/nuxtassets/fonts/gsk-li... https://www.gsk.com/nuxtassets/fonts/gsk-light.woff — 200 — 59.5 KiB — 353 ms — h3https://www.gsk.com/nuxtassets/fonts/gsk-regular.woffwww.gsk.com/nuxtassets/fonts/gsk-re... https://www.gsk.com/nuxtassets/fonts/gsk-regular.woff — 200 — 57.1 KiB — 399 ms — h3https://www.gsk.com/nuxtassets/fonts/gsk-bold.woffwww.gsk.com/nuxtassets/fonts/gsk-bo... https://www.gsk.com/nuxtassets/fonts/gsk-bold.woff — 200 — 57.3 KiB — 287 ms — h3https://www.gsk.com/nuxtassets/fonts/gsk-regularitalic.woffwww.gsk.com/nuxtassets/fonts/gsk-re... https://www.gsk.com/nuxtassets/fonts/gsk-regularitalic.woff — 200 — 56.8 KiB — 285 ms — h3https://www.gsk.com/_nuxt/BQyzoT6n.jswww.gsk.com/_nuxt/BQyzoT6n.js https://www.gsk.com/_nuxt/BQyzoT6n.js — 200 — 103.8 KiB — 763 ms — h3https://www.gsk.com/_nuxt/D5-xqjRT.jswww.gsk.com/_nuxt/D5-xqjRT.js https://www.gsk.com/_nuxt/D5-xqjRT.js — 200 — 7.8 KiB — 270 ms — h3https://www.gsk.com/_nuxt/BrrH8z0D.jswww.gsk.com/_nuxt/BrrH8z0D.js https://www.gsk.com/_nuxt/BrrH8z0D.js — 200 — 3.2 KiB — 292 ms — h3https://www.gsk.com/_nuxt/CB-xvtm1.jswww.gsk.com/_nuxt/CB-xvtm1.js https://www.gsk.com/_nuxt/CB-xvtm1.js — 200 — 288 B — 255 ms — h3https://www.gsk.com/_nuxt/CF-8EweR.jswww.gsk.com/_nuxt/CF-8EweR.js https://www.gsk.com/_nuxt/CF-8EweR.js — 200 — 774 B — 658 ms — h3https://www.gsk.com/_nuxt/_v4gJJCl.jswww.gsk.com/_nuxt/_v4gJJCl.js https://www.gsk.com/_nuxt/_v4gJJCl.js — 200 — 5.8 KiB — 298 ms — h3https://www.gsk.com/_nuxt/DeHI1n72.jswww.gsk.com/_nuxt/DeHI1n72.js https://www.gsk.com/_nuxt/DeHI1n72.js — 200 — 2.4 KiB — 258 ms — h3https://www.gsk.com/_nuxt/DiLrbaPy.jswww.gsk.com/_nuxt/DiLrbaPy.js https://www.gsk.com/_nuxt/DiLrbaPy.js — 200 — 841 B — 270 ms — h3https://www.gsk.com/_nuxt/C0DmV8Vd.jswww.gsk.com/_nuxt/C0DmV8Vd.js https://www.gsk.com/_nuxt/C0DmV8Vd.js — 200 — 524 B — 295 ms — h3https://www.gsk.com/_nuxt/Dgt8XGRz.jswww.gsk.com/_nuxt/Dgt8XGRz.js https://www.gsk.com/_nuxt/Dgt8XGRz.js — 200 — 658 B — 449 ms — h3https://www.gsk.com/_nuxt/B2k_FUN-.jswww.gsk.com/_nuxt/B2k_FUN-.js 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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 1615ms · 703KB · £17/mo
Unattributable
Other
Costly
Execution 591ms
Transfer 0 KB
Monthly Cost £6/mo
tags.tiqcdn.com
Other
Costly
Execution 388ms
Transfer 447 KB
Unused 34%
Monthly Cost £4/mo
www.gsk.com
Other
Costly
Execution 289ms
Transfer 112 KB
Monthly Cost £3/mo
www.gsk.com
Other
Optional
Execution 122ms
Transfer 104 KB
Unused 41%
Monthly Cost £1/mo
www.gsk.com
Other
Optional
Execution 108ms
Transfer 31 KB
Monthly Cost £1/mo
www.gsk.com
Other
Optional
Execution 60ms
Transfer 8 KB
Monthly Cost £1/mo
www.gsk.com
Other
Optional
Execution 57ms
Transfer 2 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • Unattributable adds 591ms and costs ~£6/month
  • tags.tiqcdn.com adds 388ms and costs ~£4/month
  • www.gsk.com adds 289ms 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

Unattributable takes 591ms 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

tags.tiqcdn.com takes 388ms 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.gsk.com takes 289ms 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

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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