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Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
3
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
28
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
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.
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.

9.42 s

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

25.59 s

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

2.23 s

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

0.030

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

9.42 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.

28.03 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
16
7 PASS 4 REVIEW 3 FIX
F
Page Weight Budget
Action
3.8 MB transferred, 226 requests
FIX
3.8 MB transferred, 226 requests
Warning::
Page weighs 9.6 MB (3.8 MB transferred)
Warning::
JavaScript is 1.8 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.8 MB
Warning::
Images are 1.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.4 MB
Info::
Fonts are 376 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 376 KB
Warning::
226 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.80 g CO2 per page load
3.8 MB / 2.4 MB budget
3.8 MB transferred
226 requests
0.80 g CO2 per page load
JavaScript 1.8 MiB 48%
Images 1.4 MiB 36%
Fonts 376.5 KiB 10%
CSS 124.7 KiB 3%
Other 85.2 KiB 2%
HTML 28.2 KiB 1%
Other 10.6 KiB 0%
Other 8.8 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

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

F
JS Execution Cost
Action
8327ms total JS execution
FIX
8327ms total JS execution
Warning::
Unattributable: 1739ms CPU time
Warning::
https://assets.adobedtm.com/16a36399704a/2efca5d8f...: 1253ms CPU time
Warning::
https://www.redcross.org/etc/clientlibs/redcross/s...: 846ms CPU time
Warning::
https://clarachat.redcross.org/polyfills-5CFQRCPP....: 508ms CPU time
Warning::
https://cdn.cookielaw.org/scripttemplates/202507.1...: 497ms CPU time
Warning::
Third-party scripts: 6309ms (76% of total)

Main Thread Breakdown

Script Evaluation 55% Other 18% Style & Layout 12% Script Parsing & Compilation 10% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
Unattributable1739ms475ms0ms3rd
https://assets.adobedtm.com/16a36399704a/2efca5d8f658/launch-b67461f3859d.min.js1253ms690ms147ms3rd
https://www.redcross.org/etc/clientlibs/redcross/shared/dependencies.min.js846ms434ms19ms1st
https://clarachat.redcross.org/polyfills-5CFQRCPP.js508ms446ms0ms3rd
https://cdn.cookielaw.org/scripttemplates/202507.1.0/otBannerSdk.js497ms300ms66ms3rd
https://www.redcross.org/495ms143ms6ms1st
https://www.redcross.org/etc/clientlibs/redcross/shared/components.min.js375ms186ms117ms1st
https://www.googletagmanager.com/gtag/js?id=AW-999092293&cx=c&gtm=4e6460370ms316ms52ms3rd
https://www.googletagmanager.com/gtag/js?id=DC-4706068349ms262ms49ms3rd
https://maps.googleapis.com/maps/api/js?key=AIzaSyBhCHZNKMH6qZxSNJbouh31lKwqcvQU0ks&callback=initMap&libraries=geometry,marker294ms192ms97ms3rd

Showing top 10 of 23 scripts

F
JS Bundles
Action
96 scripts, 773 KB unused
FIX
96 scripts, 773 KB unused
Warning::
https://www.redcross.org/etc/clientlibs/redcross/s...: 157 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.redcross.org/etc/clientlibs/redcross/s...: unminified — 35 KB could be saved
Warning::
https://maps.googleapis.com/maps/api/js?key=AIzaSy...: 145 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://doublethedonation.com/api/js/ddplugin.js: 81 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202507.1...: 64 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.adobedtm.com/16a36399704a/2efca5d8f...: 63 KB unused (29%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 773 KB
773 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.redcross.org/etc/clientlibs/redcross/shared/components.min.js219 KB157 KB (72%)✗1st
https://maps.googleapis.com/maps/api/js?key=AIzaSyBhCHZNKMH6qZxSNJbouh31lKwqcvQU0ks&callback=initMap&libraries=geometry,marker253 KB145 KB (58%)✓3rd
https://doublethedonation.com/api/js/ddplugin.js123 KB81 KB (66%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202507.1.0/otBannerSdk.js120 KB64 KB (54%)✓3rd
https://assets.adobedtm.com/16a36399704a/2efca5d8f658/launch-b67461f3859d.min.js216 KB63 KB (29%)✓3rd
https://clarachat.redcross.org/main-VDEKQFFY.js117 KB54 KB (47%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-999092293&cx=c&gtm=4e6460137 KB54 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-4706068129 KB53 KB (42%)✓3rd
https://s.go-mpulse.net/boomerang/G5EYL-3FTNM-K2QN3-FX5YQ-53AZH58 KB38 KB (66%)✓3rd
https://connect.facebook.net/en_US/fbevents.js95 KB36 KB (38%)✓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

B
Third-Party Impact
48% third-party, 0 ms blocking
REVIEW
48% third-party, 0 ms blocking
Info::
Third-party code accounts for 48% of page weight (1.8 MiB of 3.8 MiB)
Info::
Third-party blocking time is low (0 ms)
52%
48%
First-party Third-party
C
Image Optimization
Action
52 images, 0 KB saveable
REVIEW
52 images, 0 KB saveable
Warning::
https://www.redcross.org/content/dam/icons/digital... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.redcross.org/content/dam/icons/general... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.redcross.org/content/dam/icons/general... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.redcross.org/content/dam/icons/disaste... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.redcross.org/content/dam/icons/biomed/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.redcross.org/content/dam/icons/general... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.redcross.org/content/dam/icons/biomed/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.redcross.org/content/dam/redcross/red-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
52 images 1.4 MB
0 oversized -0 KB
52 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

B
HTTP Caching
max-age=0
REVIEW
max-age=0
Info::
Cache-Control header is set
Got: max-age=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0

DirectiveValueMeaning
max-age0Cache for 0 seconds
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
6 fonts (376 KB)
PASS
6 fonts (376 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

376 KB total

Render-blocking

0

of 6

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 22.0 s 24.0 s 26.0 s FCP 9.4 s LCP 25.6 shttps://www.redcross.org/etc/clientlibs/redcross/vendor/font-awesome-6/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://www.redcross.org/etc/clientlibs/redcross/vendor/font-awesome-6/webfonts/fa-brands-400.woff2 — 115.9 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 42.0 KiB — 0 ms — font-display: swaphttps://www.redcross.org/etc/clientlibs/redcross/vendor/font-awesome-6/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.redcross.org/etc/clientlibs/redcross/vendor/font-awesome-6/webfonts/fa-solid-900.woff2 — 154.6 KiB — 0 ms — font-display: swaphttps://www.redcross.org/etc/clientlibs/redcross/vendor/rco-icons/fonts/rco-icon.ttfrco-icon.ttf https://www.redcross.org/etc/clientlibs/redcross/vendor/rco-icons/fonts/rco-icon.ttf — 9.6 KiB — 0 ms — font-display: swaphttps://www.redcross.org/etc/clientlibs/redcross/vendor/rco-icons/fonts/glyphicons-halflings-regular.woff2glyphicons-halflings-re... https://www.redcross.org/etc/clientlibs/redcross/vendor/rco-icons/fonts/glyphicons-halflings-regular.woff2 — 17.7 KiB — 0 ms — font-display: swap
fa-brands-400.woff2 woff2 swap
Size 116 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 155 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
rco-icon.ttf ttf swap
Size 10 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
glyphicons-halflings-re... woff2 swap
Size 18 KB
Load time 0 ms
Start 0 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)

Fixing the unchecked items could save ~138 KB and ~276 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
226 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
76% of JavaScript execution is third-party
First-party Third-party 6309ms · 1299KB · $84/mo
Unattributable
Other
Costly
Execution 1739ms
Transfer 0 KB
Monthly Cost $23/mo
assets.adobedtm.com
Other
Costly
Execution 1253ms
Transfer 216 KB
Unused 29%
Monthly Cost $17/mo
clarachat.redcross.org
Other
Costly
Execution 508ms
Transfer 12 KB
Monthly Cost $7/mo
OneTrust
Consent
Essential
Execution 497ms
Transfer 120 KB
Unused 54%
Monthly Cost $7/mo
Google Tag Manager
Tag Manager
Costly
Execution 370ms
Transfer 137 KB
Unused 40%
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 349ms
Transfer 129 KB
Unused 42%
Monthly Cost $5/mo
maps.googleapis.com
Other
Costly
Execution 294ms
Transfer 253 KB
Unused 58%
Monthly Cost $4/mo
assets.adobedtm.com
Other
Costly
Execution 253ms
Transfer 66 KB
Unused 39%
Monthly Cost $3/mo
Facebook Pixel
Advertising
Optional
Execution 183ms
Transfer 95 KB
Unused 38%
Monthly Cost $2/mo
doublethedonation.com
Other
Optional
Execution 172ms
Transfer 123 KB
Unused 66%
Monthly Cost $2/mo
js-agent.newrelic.com
Other
Optional
Execution 132ms
Transfer 27 KB
Monthly Cost $2/mo
clarachat.redcross.org
Other
Optional
Execution 131ms
Transfer 3 KB
Monthly Cost $2/mo
Facebook Pixel
Advertising
Optional
Execution 130ms
Transfer 34 KB
Monthly Cost $2/mo
openfpcdn.io
Other
Optional
Execution 114ms
Transfer 5 KB
Monthly Cost $2/mo
s.go-mpulse.net
Other
Optional
Execution 74ms
Transfer 58 KB
Unused 66%
Monthly Cost $1/mo
OneTrust
Consent
Essential
Execution 56ms
Transfer 9 KB
Monthly Cost $1/mo
js.adsrvr.org
Other
Optional
Execution 56ms
Transfer 11 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 1739ms and costs ~$23/month
  • assets.adobedtm.com adds 1253ms and costs ~$17/month
  • clarachat.redcross.org adds 508ms and costs ~$7/month
  • Google Tag Manager adds 370ms and costs ~$5/month
  • Google Tag Manager adds 349ms and costs ~$5/month
  • maps.googleapis.com adds 294ms and costs ~$4/month
  • assets.adobedtm.com adds 253ms and costs ~$3/month

76% 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 1739ms 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

assets.adobedtm.com takes 1253ms 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

clarachat.redcross.org takes 508ms 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

54% of OneTrust'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

Google Tag Manager takes 370ms 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

Google Tag Manager takes 349ms 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

maps.googleapis.com takes 294ms 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

58% of maps.googleapis.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

assets.adobedtm.com takes 253ms 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 doublethedonation.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

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

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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