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https://royalmail.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
6
REVIEW
2
PASS
5
INFO
2

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

Mobile Desktop
64
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.
73
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.

1.68 s

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

3.35 s

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

184 ms

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

0.052

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

2.83 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.

4.38 s

Page Load Progression

606 ms
1.2 s
1.8 s
2.4 s
3.0 s
3.6 s
4.2 s
4.8 s
Checks
15
5 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
3.6 MB transferred, 129 requests
FIX
3.6 MB transferred, 129 requests
Warning::
Page weighs 10.9 MB (3.6 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 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
Info::
Fonts are 299 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 299 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::
129 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.76 g CO2 per page load
3.6 MB / 2.4 MB budget
3.6 MB transferred
129 requests
0.76 g CO2 per page load
Images 1.5 MiB 42%
JavaScript 1.5 MiB 41%
Fonts 299.1 KiB 8%
CSS 219.4 KiB 6%
HTML 124.5 KiB 3%
Other 6.5 KiB 0%
Other 5.2 KiB 0%
Other 1.7 KiB 0%
Other 0 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

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 (3.6 MiB of 3.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2192ms total JS execution
FIX
2192ms total JS execution
Warning::
https://www.royalmail.com/u1jbb/Tf/Vav/-W/yyd6Czwn...: 618ms CPU time
Warning::
Unattributable: 498ms CPU time
Warning::
https://www.royalmail.com/: 326ms CPU time
Info::
https://tags.tiqcdn.com/utag/royalmail/main/prod/u...: 211ms CPU time
Info::
https://s.go-mpulse.net/boomerang/HJFQV-8LNNV-HYVX...: 127ms CPU time
Warning::
Third-party scripts: 2192ms (100% of total)

Main Thread Breakdown

Script Evaluation 50% Other 29% Style & Layout 7% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://www.royalmail.com/u1jbb/Tf/Vav/-W/yyd6Czwn/mcpiQbEp7JawQX/AHckAWsB/Yl9UY0/xFSysB618ms485ms54ms3rd
Unattributable498ms21ms0ms3rd
https://www.royalmail.com/326ms13ms1ms3rd
https://tags.tiqcdn.com/utag/royalmail/main/prod/utag.js211ms178ms18ms3rd
https://s.go-mpulse.net/boomerang/HJFQV-8LNNV-HYVXV-9PJNM-6TRGV127ms101ms20ms3rd
https://www.royalmail.com/akam/13/ea60a0a119ms107ms7ms3rd
https://unpkg.com/@dotlottie/player-component@2.7.12/dist/lottie_svg-MJGYILXD-NRTSROOT.mjs108ms54ms1ms3rd
https://www.royalmail.com/sites/royalmail.com/files/js/js_cRoecrtLpXSiC6SiRPL9n_g1wG7QJi61DyesOtDJT4g.js73ms60ms4ms3rd
https://unpkg.com/@dotlottie/player-component@2.7.12/dist/dotlottie-player.mjs61ms45ms0ms3rd
https://www.royalmail.com/sites/royalmail.com/files/js/js_WF8b4scziJlMO7peH-3VFESYy9DqB0c64wzfGPqXlI8.js51ms21ms25ms3rd
D
JS Bundles
Action
33 scripts, 382 KB unused
FIX
33 scripts, 382 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...: 61 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: 382 KB
382 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.royalmail.com/sites/royalmail.com/files/js/js_WF8b4scziJlMO7peH-3VFESYy9DqB0c64wzfGPqXlI8.js107 KB85 KB (80%)✓3rd
https://tags.tiqcdn.com/utag/royalmail/main/prod/utag.js126 KB61 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 KB25 KB (70%)✓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
129 resources · 3.6 MB · 382 KB savings available
FIX
129 resources · 3.6 MB · 382 KB savings available
Warning::
Page weight 2.6 MB over 1MB target
Got: 3.6 MB Expected: ≤ 1 MB
Info::
~382 KB of savings available
Warning::
128 third-party resources (100% of weight)
Info::
2 resources over 200KB
129 resources · 3.6 MiB · 128 third-party 2.6 MiB over 1MB target
Image 42% · 1.5 MiB
JavaScript 41% · 1.5 MiB
Font 8% · 299.1 KiB
CSS 6% · 219.4 KiB
Document 3% · 127.2 KiB
Other 0% · 9.0 KiB

~382.3 KiB of savings available

Remove unused JavaScript: 382.3 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
53 images, 0 KB saveable
REVIEW
53 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.
53 images 1.5 MB
0 oversized -0 KB
50 legacy format
8 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

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
14 fonts (299 KB)
PASS
14 fonts (299 KB)
Info::
14 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

14

299 KB total

Render-blocking

0

of 14

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 FCP 1.7 s LCP 3.4 shttps://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 — 252 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 — 35.0 KiB — 309 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 — 95 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 — 303 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 — 36 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 — 299 ms — font-display: swaphttps://www.royalmail.com/themes/custom/rmlcwr/fonts/PF_DIN_Regular/PF_DIN_Regular.woffPF_DIN_Regular.woff https://www.royalmail.com/themes/custom/rmlcwr/fonts/PF_DIN_Regular/PF_DIN_Regular.woff — 44.5 KiB — 68 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://consent.trustarc.com/get?name=PFDinTextStd-Bold.otfget https://consent.trustarc.com/get?name=PFDinTextStd-Bold.otf — 58.1 KiB — 7 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 35 ms — font-display: swap
RMFirstClass_W_In.woff woff swap
Size 16 KB
Load time 252 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
chevin-bold.woff woff swap
Size 35 KB
Load time 309 ms
Start 1.6 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 95 ms
Start 1.6 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 303 ms
Start 1.6 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 36 ms
Start 1.6 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 299 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
PF_DIN_Regular.woff woff swap
Size 45 KB
Load time 68 ms
Start 2.6 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 2.6 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 2.6 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 2.6 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 2.6 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 2.6 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
get otf swap
Size 58 KB
Load time 7 ms
Start 2.9 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 35 ms
Start 4.1 s
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~80 KB and ~160 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
129 requests over 7376ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 1.7 s LCP 3.4 shttps://royalmail.com// https://royalmail.com/ — 301 — 290 B — 934 ms — http/1.1https://www.royalmail.com/www.royalmail.com/ https://www.royalmail.com/ — 200 — 64.2 KiB — 663 ms — h2https://www.royalmail.com/themes/custom/rmlcwr/fonts/RMFirstClass/RMFirstClass_W_In.woffwww.royalmail.com/themes/custom/rml... https://www.royalmail.com/themes/custom/rmlcwr/fonts/RMFirstClass/RMFirstClass_W_In.woff — 200 — 16.2 KiB — 252 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 — 309 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 — 95 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 — 303 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 — 36 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 — 299 ms — 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https://c.go-mpulse.net/api/config.json?key=HJFQV-8LNNV-HYVXV-9PJNM-6TRGV&d=www.royalmail.com&t=5922998&v=1.632.0&if=&sl=0&si=rfqkmet8hq-tdx4b6&plugins=AK,ConfigOverride,Continuity,PageParams,IFrameDelay,AutoXHR,SPA,Angular,Backbone,Ember,History,RT,CrossDomain,BW,PaintTiming,NavigationTiming,ResourceTiming,Memory,CACHE_RELOAD,Errors,TPAnalytics,UserTiming,Akamai,LOGN&acao=&ak.ai=649681 — 200 — 214 B — 252 ms — h2https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.5f0apfZzpOA.2021.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywFg3MG1UeKh8ePjbhY_YEMv-NHjmA/m=r78Drbwww.youtube.com/s/_/ytembeds/_/js/k... https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.5f0apfZzpOA.2021.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywFg3MG1UeKh8ePjbhY_YEMv-NHjmA/m=r78Drb — 200 — 183.2 KiB — 19 ms — h2https://www.royalmail.com/akam/13/pixel_ea60a0awww.royalmail.com/akam/13/pixel_ea6... https://www.royalmail.com/akam/13/pixel_ea60a0a — 200 — 676 B — 15 ms — h2https://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 — 26 ms — h2https://yt3.ggpht.com/Ek-KTYe6mJ8wFJ1FQparwb7OtC0DlSGx47d-QSQjw1Q4WJmMV_3kPZryy4pY7A51A8EnfPPWug=s68-c-k-c0x00ffffff-no-rjyt3.ggpht.com/Ek-KTYe6mJ8wFJ1FQparw... https://yt3.ggpht.com/Ek-KTYe6mJ8wFJ1FQparwb7OtC0DlSGx47d-QSQjw1Q4WJmMV_3kPZryy4pY7A51A8EnfPPWug=s68-c-k-c0x00ffffff-no-rj — 200 — 2.8 KiB — 22 ms — h2https://www.gstatic.com/youtube/img/icons/mweb/youtube_fill/logo/v2/67px.svgwww.gstatic.com/youtube/img/icons/m... https://www.gstatic.com/youtube/img/icons/mweb/youtube_fill/logo/v2/67px.svg — 200 — 733 B — 17 ms — h2https://www.royalmail.com/favicon.icowww.royalmail.com/favicon.ico https://www.royalmail.com/favicon.ico — 404 — 1.1 KiB — 204 ms — h2https://www.google.com/js/th/qKGyavTtqsN8WEgkipKf66gOrjuRyzmwbl6TXabwSno.jswww.google.com/js/th/qKGyavTtqsN8WE... https://www.google.com/js/th/qKGyavTtqsN8WEgkipKf66gOrjuRyzmwbl6TXabwSno.js — 200 — 23.2 KiB — 18 ms — h3blob:https://www.royalmail.com/a5a3f9a4-ae3a-41be-9cfe-69a2bd02a309www.royalmail.com/a5a3f9a4-ae3a-41b... blob:https://www.royalmail.com/a5a3f9a4-ae3a-41be-9cfe-69a2bd02a309 — -1 — 0 B — 0 ms — https://www.youtube-nocookie.com/generate_204?HzGdjwwww.youtube-nocookie.com/generate_2... https://www.youtube-nocookie.com/generate_204?HzGdjw — 204 — 10 B — 4 ms — h3https://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 — 276 ms — h2https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 0 B — 19 ms — h2https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 311 B — 14 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 — 8 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 2192ms · 407KB · £23/mo
www.royalmail.com
Other
Costly
Execution 618ms
Transfer 1 KB
Unused 22%
Monthly Cost £6/mo
Unattributable
Other
Costly
Execution 498ms
Transfer 0 KB
Monthly Cost £5/mo
www.royalmail.com
Other
Costly
Execution 326ms
Transfer 64 KB
Monthly Cost £3/mo
tags.tiqcdn.com
Other
Costly
Execution 211ms
Transfer 126 KB
Unused 49%
Monthly Cost £2/mo
s.go-mpulse.net
Other
Optional
Execution 127ms
Transfer 0 KB
Unused 66%
Monthly Cost £1/mo
www.royalmail.com
Other
Optional
Execution 119ms
Transfer 1 KB
Monthly Cost £1/mo
unpkg
CDN
Optional
Execution 108ms
Transfer 64 KB
Unused 60%
Monthly Cost £1/mo
www.royalmail.com
Other
Optional
Execution 73ms
Transfer 36 KB
Monthly Cost £1/mo
unpkg
CDN
Optional
Execution 61ms
Transfer 8 KB
Monthly Cost £1/mo
www.royalmail.com
Other
Optional
Execution 51ms
Transfer 107 KB
Unused 80%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.royalmail.com adds 618ms and costs ~£6/month
  • Unattributable adds 498ms and costs ~£5/month
  • www.royalmail.com adds 326ms and costs ~£3/month
  • tags.tiqcdn.com adds 211ms and costs ~£2/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 618ms 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 498ms 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 326ms 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 211ms 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

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

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

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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