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https://royalmail.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
32
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
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.
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.

4.61 s

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

19.19 s

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

2.03 s

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

0.049

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

6.70 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.

20.28 s

Page Load Progression

490 ms
981 ms
1.5 s
2.0 s
2.5 s
2.9 s
3.4 s
3.9 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
3.4 MB transferred, 125 requests
FIX
3.4 MB transferred, 125 requests
Warning::
Page weighs 10.7 MB (3.4 MB transferred)
Warning::
JavaScript is 1.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.5 MB
Warning::
Images are 1.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.3 MB
Info::
Fonts are 255 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 255 KB
Info::
CSS is 219 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 219 KB
Warning::
125 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.71 g CO2 per page load
3.4 MB / 2.4 MB budget
3.4 MB transferred
125 requests
0.71 g CO2 per page load
JavaScript 1.5 MiB 43%
Images 1.3 MiB 39%
Fonts 254.5 KiB 7%
CSS 219.3 KiB 6%
HTML 124.8 KiB 4%
Other 6.0 KiB 0%
Other 4.5 KiB 0%
Other 1.2 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

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

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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

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 (3.4 MiB of 3.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
9685ms total JS execution
FIX
9685ms total JS execution
Warning::
https://www.royalmail.com/u1jbb/Tf/Vav/-W/yyd6Czwn...: 2583ms CPU time
Warning::
Unattributable: 2059ms CPU time
Warning::
https://www.royalmail.com/: 1274ms CPU time
Warning::
https://www.royalmail.com/akam/13/ea60a0a: 768ms CPU time
Warning::
https://tags.tiqcdn.com/utag/royalmail/main/prod/u...: 685ms CPU time
Warning::
Third-party scripts: 9685ms (100% of total)

Main Thread Breakdown

Script Evaluation 52% Other 30% Style & Layout 6% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://www.royalmail.com/u1jbb/Tf/Vav/-W/yyd6Czwn/mcpiQbEp7JawQX/AHckAWsB/Yl9UY0/xFSysB2583ms2192ms195ms3rd
Unattributable2059ms106ms0ms3rd
https://www.royalmail.com/1274ms51ms4ms3rd
https://www.royalmail.com/akam/13/ea60a0a768ms535ms11ms3rd
https://tags.tiqcdn.com/utag/royalmail/main/prod/utag.js685ms574ms71ms3rd
https://s.go-mpulse.net/boomerang/HJFQV-8LNNV-HYVXV-9PJNM-6TRGV636ms536ms79ms3rd
https://unpkg.com/@dotlottie/player-component@2.7.12/dist/lottie_svg-MJGYILXD-NRTSROOT.mjs573ms290ms1ms3rd
https://www.royalmail.com/sites/royalmail.com/files/js/js_cRoecrtLpXSiC6SiRPL9n_g1wG7QJi61DyesOtDJT4g.js277ms237ms17ms3rd
https://unpkg.com/@dotlottie/player-component@2.7.12/dist/dotlottie-player.mjs185ms149ms0ms3rd
https://www.royalmail.com/sites/royalmail.com/files/js/js_WF8b4scziJlMO7peH-3VFESYy9DqB0c64wzfGPqXlI8.js146ms76ms68ms3rd

Showing top 10 of 15 scripts

D
JS Bundles
Action
33 scripts, 367 KB unused
FIX
33 scripts, 367 KB unused
Warning::
https://www.royalmail.com/sites/royalmail.com/file...: 85 KB unused (80%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://tags.tiqcdn.com/utag/royalmail/main/prod/u...: 46 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://s.go-mpulse.net/boomerang/HJFQV-8LNNV-HYVX...: 38 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://s.go-mpulse.net/boomerang/HJFQV-8LNNV-HYVX...: 38 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://unpkg.com/@dotlottie/player-component@2.7....: 38 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 367 KB
367 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.royalmail.com/sites/royalmail.com/files/js/js_WF8b4scziJlMO7peH-3VFESYy9DqB0c64wzfGPqXlI8.js106 KB85 KB (80%)✓3rd
https://tags.tiqcdn.com/utag/royalmail/main/prod/utag.js126 KB46 KB (49%)✓3rd
https://s.go-mpulse.net/boomerang/HJFQV-8LNNV-HYVXV-9PJNM-6TRGV58 KB38 KB (66%)✓3rd
https://s.go-mpulse.net/boomerang/HJFQV-8LNNV-HYVXV-9PJNM-6TRGV0 KB38 KB (66%)✓3rd
https://unpkg.com/@dotlottie/player-component@2.7.12/dist/lottie_svg-MJGYILXD-NRTSROOT.mjs64 KB38 KB (60%)✓3rd
https://www.royalmail.com/u1jbb/Tf/Vav/-W/yyd6Czwn/mcpiQbEp7JawQX/AHckAWsB/Yl9UY0/xFSysB0 KB38 KB (22%)✓3rd
https://www.royalmail.com/u1jbb/Tf/Vav/-W/yyd6Czwn/mcpiQbEp7JawQX/AHckAWsB/Yl9UY0/xFSysB175 KB38 KB (22%)✓3rd
https://consent.trustarc.com/asset/notice.js/v/v1.7-172936 KB26 KB (71%)✓3rd
https://static.addtoany.com/menu/modules/core.ydpp7jcu.js26 KB21 KB (82%)✓3rd
https://unpkg.com/@dotlottie/player-component@2.7.12/dist/chunk-ODPU3M3Z.mjs8 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

D
Page Weight Inventory
Action
125 resources · 3.4 MB · 367 KB savings available
FIX
125 resources · 3.4 MB · 367 KB savings available
Warning::
Page weight 2.4 MB over 1MB target
Got: 3.4 MB Expected: ≤ 1 MB
Info::
~367 KB of savings available
Warning::
124 third-party resources (100% of weight)
Info::
2 resources over 200KB
125 resources · 3.4 MiB · 124 third-party 2.4 MiB over 1MB target
JavaScript 43% · 1.5 MiB
Image 39% · 1.3 MiB
Font 7% · 254.5 KiB
CSS 6% · 219.3 KiB
Document 4% · 126.6 KiB
Other 0% · 9.1 KiB

~367.4 KiB of savings available

Remove unused JavaScript: 367.4 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.

C
Image Optimization
Action
52 images, 0 KB saveable
REVIEW
52 images, 0 KB saveable
Warning::
https://www.royalmail.com/sites/royalmail.com/file... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.royalmail.com/sites/royalmail.com/file... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.royalmail.com/sites/royalmail.com/file... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.royalmail.com/sites/royalmail.com/file... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://consent.trustarc.com/get?name=royal-mail-l... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.royalmail.com/sites/royalmail.com/file... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.royalmail.com/sites/royalmail.com/file... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.royalmail.com/sites/royalmail.com/file... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.royalmail.com/sites/royalmail.com/file... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
52 images 1.3 MB
0 oversized -0 KB
48 legacy format
9 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

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

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

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

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

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

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

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

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
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
13 fonts (255 KB)
PASS
13 fonts (255 KB)
Info::
13 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

13

255 KB total

Render-blocking

0

of 13

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 14.0 s 16.0 s 18.0 s 20.0 s FCP 4.6 s LCP 19.2 shttps://www.royalmail.com/themes/custom/rmlcwr/fonts/chevin/chevin-bold/chevin-bold.woffchevin-bold.woff https://www.royalmail.com/themes/custom/rmlcwr/fonts/chevin/chevin-bold/chevin-bold.woff — 35.0 KiB — 17 ms — font-display: swaphttps://www.royalmail.com/themes/custom/rmlcwr/fonts/chevin/chevin-medium/chevin-medium.woffchevin-medium.woff https://www.royalmail.com/themes/custom/rmlcwr/fonts/chevin/chevin-medium/chevin-medium.woff — 34.1 KiB — 69 ms — font-display: swaphttps://www.royalmail.com/themes/custom/rmlcwr/fonts/pf-din-text-std/pf-din-text-std-bold/pfdintextstd-bold-webfont.woffpfdintextstd-bold-webfo... https://www.royalmail.com/themes/custom/rmlcwr/fonts/pf-din-text-std/pf-din-text-std-bold/pfdintextstd-bold-webfont.woff — 32.9 KiB — 76 ms — font-display: swaphttps://www.royalmail.com/themes/custom/rmlcwr/fonts/RMFirstClass/RMFirstClass_W_Sd.woffRMFirstClass_W_Sd.woff https://www.royalmail.com/themes/custom/rmlcwr/fonts/RMFirstClass/RMFirstClass_W_Sd.woff — 12.0 KiB — 79 ms — font-display: swaphttps://www.royalmail.com/themes/custom/rmlcwr/fonts/pf-din-text-std/pf-din-text-std-regular/pfdintextstd-reg-webfont.woffpfdintextstd-reg-webfon... https://www.royalmail.com/themes/custom/rmlcwr/fonts/pf-din-text-std/pf-din-text-std-regular/pfdintextstd-reg-webfont.woff — 32.3 KiB — 49 ms — font-display: swaphttps://www.royalmail.com/themes/custom/rmlcwr/fonts/RMFirstClass/RMFirstClass_W_In.woffRMFirstClass_W_In.woff https://www.royalmail.com/themes/custom/rmlcwr/fonts/RMFirstClass/RMFirstClass_W_In.woff — 16.2 KiB — 30 ms — font-display: swaphttps://www.royalmail.com/themes/custom/rmlcwr/fonts/chevin/chevin-bold/chevin-bold.woffchevin-bold.woff https://www.royalmail.com/themes/custom/rmlcwr/fonts/chevin/chevin-bold/chevin-bold.woff — 0 B — 0 ms — font-display: swaphttps://www.royalmail.com/themes/custom/rmlcwr/fonts/chevin/chevin-medium/chevin-medium.woffchevin-medium.woff https://www.royalmail.com/themes/custom/rmlcwr/fonts/chevin/chevin-medium/chevin-medium.woff — 0 B — 0 ms — font-display: swaphttps://www.royalmail.com/themes/custom/rmlcwr/fonts/pf-din-text-std/pf-din-text-std-bold/pfdintextstd-bold-webfont.woffpfdintextstd-bold-webfo... https://www.royalmail.com/themes/custom/rmlcwr/fonts/pf-din-text-std/pf-din-text-std-bold/pfdintextstd-bold-webfont.woff — 0 B — 0 ms — font-display: swaphttps://www.royalmail.com/themes/custom/rmlcwr/fonts/RMFirstClass/RMFirstClass_W_Sd.woffRMFirstClass_W_Sd.woff https://www.royalmail.com/themes/custom/rmlcwr/fonts/RMFirstClass/RMFirstClass_W_Sd.woff — 0 B — 0 ms — font-display: swaphttps://www.royalmail.com/themes/custom/rmlcwr/fonts/pf-din-text-std/pf-din-text-std-regular/pfdintextstd-reg-webfont.woffpfdintextstd-reg-webfon... https://www.royalmail.com/themes/custom/rmlcwr/fonts/pf-din-text-std/pf-din-text-std-regular/pfdintextstd-reg-webfont.woff — 0 B — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 25 ms — font-display: swaphttps://consent.trustarc.com/get?name=PFDinTextStd-Bold.otfget https://consent.trustarc.com/get?name=PFDinTextStd-Bold.otf — 58.1 KiB — 11 ms — font-display: swap
chevin-bold.woff woff swap
Size 35 KB
Load time 17 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
chevin-medium.woff woff swap
Size 34 KB
Load time 69 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
pfdintextstd-bold-webfo... woff swap
Size 33 KB
Load time 76 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
RMFirstClass_W_Sd.woff woff swap
Size 12 KB
Load time 79 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
pfdintextstd-reg-webfon... woff swap
Size 32 KB
Load time 49 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
RMFirstClass_W_In.woff woff swap
Size 16 KB
Load time 30 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
chevin-bold.woff woff swap
Size 0 KB
Load time 0 ms
Start 2.4 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
chevin-medium.woff woff swap
Size 0 KB
Load time 0 ms
Start 2.4 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
pfdintextstd-bold-webfo... woff swap
Size 0 KB
Load time 0 ms
Start 2.4 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
RMFirstClass_W_Sd.woff woff swap
Size 0 KB
Load time 0 ms
Start 2.4 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
pfdintextstd-reg-webfon... woff swap
Size 0 KB
Load time 0 ms
Start 2.4 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 25 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
get otf swap
Size 58 KB
Load time 11 ms
Start 3.2 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 ~66 KB and ~132 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
Network Waterfall
125 requests over 5888ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 4.6 s LCP 19.2 shttps://royalmail.com// https://royalmail.com/ — 301 — 290 B — 937 ms — http/1.1https://www.royalmail.com/www.royalmail.com/ https://www.royalmail.com/ — 200 — 64.2 KiB — 512 ms — h2https://www.royalmail.com/themes/custom/rmlcwr/fonts/chevin/chevin-bold/chevin-bold.woffwww.royalmail.com/themes/custom/rml... https://www.royalmail.com/themes/custom/rmlcwr/fonts/chevin/chevin-bold/chevin-bold.woff — 200 — 35.0 KiB — 17 ms — h2https://www.royalmail.com/themes/custom/rmlcwr/fonts/chevin/chevin-medium/chevin-medium.woffwww.royalmail.com/themes/custom/rml... https://www.royalmail.com/themes/custom/rmlcwr/fonts/chevin/chevin-medium/chevin-medium.woff — 200 — 34.1 KiB — 69 ms — h2https://www.royalmail.com/themes/custom/rmlcwr/fonts/pf-din-text-std/pf-din-text-std-bold/pfdintextstd-bold-webfont.woffwww.royalmail.com/themes/custom/rml... https://www.royalmail.com/themes/custom/rmlcwr/fonts/pf-din-text-std/pf-din-text-std-bold/pfdintextstd-bold-webfont.woff — 200 — 32.9 KiB — 76 ms — h2https://www.royalmail.com/themes/custom/rmlcwr/fonts/RMFirstClass/RMFirstClass_W_Sd.woffwww.royalmail.com/themes/custom/rml... https://www.royalmail.com/themes/custom/rmlcwr/fonts/RMFirstClass/RMFirstClass_W_Sd.woff — 200 — 12.0 KiB — 79 ms — h2https://www.royalmail.com/themes/custom/rmlcwr/fonts/pf-din-text-std/pf-din-text-std-regular/pfdintextstd-reg-webfont.woffwww.royalmail.com/themes/custom/rml... https://www.royalmail.com/themes/custom/rmlcwr/fonts/pf-din-text-std/pf-din-text-std-regular/pfdintextstd-reg-webfont.woff — 200 — 32.3 KiB — 49 ms — h2https://www.royalmail.com/sites/royalmail.com/files/css/css_ODYokhBbKR7FlzA-7fl3l0uJBWiju94YNrYAHDY3YpI.csswww.royalmail.com/sites/royalmail.c... https://www.royalmail.com/sites/royalmail.com/files/css/css_ODYokhBbKR7FlzA-7fl3l0uJBWiju94YNrYAHDY3YpI.css — 200 — 4.1 KiB — 70 ms — 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h2https://consent.trustarc.com/get?name=PFDinTextStd-Bold.otfconsent.trustarc.com/get?name=PFDin... https://consent.trustarc.com/get?name=PFDinTextStd-Bold.otf — 200 — 58.1 KiB — 11 ms — h2https://unpkg.com/@dotlottie/player-component@2.7.12/dist/lottie_svg-MJGYILXD-NRTSROOT.mjsunpkg.com/@dotlottie/player-compone... https://unpkg.com/@dotlottie/player-component@2.7.12/dist/lottie_svg-MJGYILXD-NRTSROOT.mjs — 200 — 63.5 KiB — 33 ms — h3https://i.ytimg.com/vi/Xm9EUTWd3-o/sddefault.jpg?sqp=-oaymwEmCIAFEOAD8quKqQMa8AEB-AH-CYAC0AWKAgwIABABGHIgSSg8MA8=&rs=AOn4CLAtFXFkhz_amrPi0lOfIiIQhz89iwi.ytimg.com/vi/Xm9EUTWd3-o/sddefaul... https://i.ytimg.com/vi/Xm9EUTWd3-o/sddefault.jpg?sqp=-oaymwEmCIAFEOAD8quKqQMa8AEB-AH-CYAC0AWKAgwIABABGHIgSSg8MA8=&rs=AOn4CLAtFXFkhz_amrPi0lOfIiIQhz89iw — 200 — 28.1 KiB — 21 ms — h2https://tags.tiqcdn.com/utag/royalmail/main/prod/utag.v.js?a=royalmail/main/202604171042&cb=1776899275147tags.tiqcdn.com/utag/royalmail/main... 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blob:https://www.royalmail.com/ede050f8-bf77-4971-8928-19ada981a079 — -1 — 0 B — 0 ms — https://www.royalmail.com/u1jbb/Tf/Vav/-W/yyd6Czwn/mcpiQbEp7JawQX/AHckAWsB/Yl9UY0/xFSysBwww.royalmail.com/u1jbb/Tf/Vav/-W/y... https://www.royalmail.com/u1jbb/Tf/Vav/-W/yyd6Czwn/mcpiQbEp7JawQX/AHckAWsB/Yl9UY0/xFSysB — 201 — 1.1 KiB — 617 ms — h2https://www.youtube-nocookie.com/youtubei/v1/log_event?alt=jsonwww.youtube-nocookie.com/youtubei/v... https://www.youtube-nocookie.com/youtubei/v1/log_event?alt=json — 200 — 50 B — 9 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 9685ms · 588KB · £100/mo
www.royalmail.com
Other
Costly
Execution 2583ms
Transfer 1 KB
Unused 22%
Monthly Cost £27/mo
Unattributable
Other
Costly
Execution 2059ms
Transfer 0 KB
Monthly Cost £21/mo
www.royalmail.com
Other
Costly
Execution 1274ms
Transfer 64 KB
Monthly Cost £13/mo
www.royalmail.com
Other
Costly
Execution 768ms
Transfer 1 KB
Monthly Cost £8/mo
tags.tiqcdn.com
Other
Costly
Execution 685ms
Transfer 126 KB
Unused 49%
Monthly Cost £7/mo
s.go-mpulse.net
Other
Costly
Execution 636ms
Transfer 0 KB
Unused 66%
Monthly Cost £7/mo
unpkg
CDN
Costly
Execution 573ms
Transfer 64 KB
Unused 60%
Monthly Cost £6/mo
www.royalmail.com
Other
Costly
Execution 277ms
Transfer 36 KB
Monthly Cost £3/mo
unpkg
CDN
Optional
Execution 185ms
Transfer 8 KB
Monthly Cost £2/mo
www.royalmail.com
Other
Optional
Execution 146ms
Transfer 106 KB
Unused 80%
Monthly Cost £2/mo
consent.trustarc.com
Other
Optional
Execution 134ms
Transfer 21 KB
Monthly Cost £1/mo
unpkg
CDN
Optional
Execution 106ms
Transfer 8 KB
Monthly Cost £1/mo
www.royalmail.com
Other
Optional
Execution 106ms
Transfer 111 KB
Monthly Cost £1/mo
www.royalmail.com
Other
Optional
Execution 87ms
Transfer 5 KB
Monthly Cost £1/mo
consent.trustarc.com
Other
Optional
Execution 66ms
Transfer 36 KB
Unused 71%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.royalmail.com adds 2583ms and costs ~£27/month
  • Unattributable adds 2059ms and costs ~£21/month
  • www.royalmail.com adds 1274ms and costs ~£13/month
  • www.royalmail.com adds 768ms and costs ~£8/month
  • tags.tiqcdn.com adds 685ms and costs ~£7/month
  • s.go-mpulse.net adds 636ms and costs ~£7/month
  • unpkg adds 573ms and costs ~£6/month
  • www.royalmail.com adds 277ms 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.royalmail.com takes 2583ms 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 2059ms 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.royalmail.com takes 1274ms 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.royalmail.com takes 768ms 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 685ms 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

s.go-mpulse.net takes 636ms 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

66% of s.go-mpulse.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

unpkg takes 573ms 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

60% of unpkg'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.royalmail.com takes 277ms 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 www.royalmail.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

71% of consent.trustarc.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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