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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
94
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
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.

1.01 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.

28 ms

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

0.008

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

1.45 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.

2.33 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
15
5 PASS 4 REVIEW 4 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 96 requests
FIX
2.2 MB transferred, 96 requests
Info::
Page weighs 4.0 MB (2.2 MB transferred)
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
Warning::
JavaScript is 639 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 639 KB
Info::
96 HTTP requests
Info::
Estimated 0.47 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
96 requests
0.47 g CO2 per page load
Images 1.3 MiB 60%
JavaScript 638.8 KiB 28%
Fonts 125.4 KiB 6%
CSS 48.7 KiB 2%
Other 35.3 KiB 2%
HTML 32.4 KiB 1%
Other 17.3 KiB 1%
Other 8.8 KiB 0%
Other 555 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

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 (2.2 MiB of 2.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
96 resources · 2.2 MB · 290 KB savings available
FIX
96 resources · 2.2 MB · 290 KB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Info::
~290 KB of savings available
Warning::
95 third-party resources (100% of weight)
Info::
3 resources over 200KB
96 resources · 2.2 MiB · 95 third-party 1.2 MiB over 1MB target
Image 60% · 1.3 MiB
JavaScript 29% · 653.2 KiB
Font 6% · 125.4 KiB
CSS 2% · 53.5 KiB
Document 2% · 38.7 KiB
Other 2% · 34.1 KiB

~290.2 KiB of savings available

Remove unused JavaScript: 290.2 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
36 images, 0 KB saveable
REVIEW
36 images, 0 KB saveable
Warning::
https://www.ala.org/themes/custom/ala/logo.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ala.org/themes/custom/ala/assets/image... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
36 images 1.3 MB
0 oversized -0 KB
18 legacy format
2 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

B
JS Execution Cost
897ms total JS execution
REVIEW
897ms total JS execution
Warning::
https://www.ala.org/: 295ms CPU time
Info::
Unattributable: 192ms CPU time
Info::
https://cookie-cdn.cookiepro.com/scripttemplates/6...: 120ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-QM62...: 117ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-PGK...: 95ms CPU time
Warning::
Third-party scripts: 897ms (100% of total)

Main Thread Breakdown

Script Evaluation 40% Other 24% Style & Layout 21% Script Parsing & Compilation 6% Parse HTML & CSS 5% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.ala.org/295ms3ms0ms3rd
Unattributable192ms20ms0ms3rd
https://cookie-cdn.cookiepro.com/scripttemplates/6.39.0/otBannerSdk.js120ms65ms12ms3rd
https://www.googletagmanager.com/gtag/js?id=G-QM624B6ZSD&cx=c&gtm=4e64h1117ms99ms17ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PGK7ZWT95ms74ms15ms3rd
https://www.ala.org/sites/default/files/js/js_2046u_XUQevkjYqSfIM_23AxrRK_TMdMWhbwcixqVSc.js?scope=footer&delta=0&language=en&theme=ala&include=eJxdjEEOgCAMBD-E8iSyUGw0lZrCQX8vMRzUy2ZmDguipiiXx4B5MS3NQeAhx1rytNXHEiQXgk1VVso2mlF9BxaNkAcbYkj9Cv3DHKuy5NDAnvv8fcaG8xv3G9DMOok78ms37ms3ms3rd
C
JS Bundles
Action
24 scripts, 290 KB unused
REVIEW
24 scripts, 290 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-QM62...: 70 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PGK...: 68 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cookie-cdn.cookiepro.com/scripttemplates/6...: 45 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://salesiq.zohopublic.com/widget: 32 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ala.org/sites/default/files/js/js_2046...: 29 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 290 KB
290 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-QM624B6ZSD&cx=c&gtm=4e64h1176 KB70 KB (40%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PGK7ZWT138 KB68 KB (49%)✓3rd
https://cookie-cdn.cookiepro.com/scripttemplates/6.39.0/otBannerSdk.js89 KB45 KB (51%)✓3rd
https://salesiq.zohopublic.com/widget48 KB32 KB (66%)✓3rd
https://www.ala.org/sites/default/files/js/js_2046u_XUQevkjYqSfIM_23AxrRK_TMdMWhbwcixqVSc.js?scope=footer&delta=0&language=en&theme=ala&include=eJxdjEEOgCAMBD-E8iSyUGw0lZrCQX8vMRzUy2ZmDguipiiXx4B5MS3NQeAhx1rytNXHEiQXgk1VVso2mlF9BxaNkAcbYkj9Cv3DHKuy5NDAnvv8fcaG8xv3G9DMOok40 KB29 KB (75%)✓3rd
https://cdn.jsdelivr.net/npm/swiper@9/swiper-bundle.min.js40 KB25 KB (64%)✓3rd
https://static.addtoany.com/menu/modules/core.ydpp7jcu.js26 KB21 KB (82%)✓3rd
https://static.addtoany.com/menu/page.js2 KB—✓3rd
https://www.ala.org/modules/contrib/google_tag/js/gtag.js?tdtaih1 KB—✓3rd
https://www.ala.org/sites/default/files/js/js_NhnB-mPnYFLm0wXapvstfan2zQUvUYFg-Fi2v1Ik8iI.js?scope=header&delta=0&language=en&theme=ala&include=eJxdjEEOgCAMBD-E8iSyUGw0lZrCQX8vMRzUy2ZmDguipiiXx4B5MS3NQeAhx1rytNXHEiQXgk1VVso2mlF9BxaNkAcbYkj9Cv3DHKuy5NDAnvv8fcaG8xv3G9DMOok1 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

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
6 fonts (125 KB)
PASS
6 fonts (125 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

125 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 500 ms 1.0 s FCP 1.0 s LCP 1.3 sdata:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA…font-woff;charset=utf-8... data:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA… — 1.6 KiB — 156 ms — font-display: swaphttps://use.typekit.net/af/2faad1/00000000000000007735a7dd/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n3&v=3l https://use.typekit.net/af/2faad1/00000000000000007735a7dd/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n3&v=3 — 22.3 KiB — 11 ms — font-display: swaphttps://fonts.gstatic.com/s/bitter/v40/rax8HiqOu8IVPmn7f4xpLjpSmw.woff2rax8HiqOu8IVPmn7f4xpLjp... https://fonts.gstatic.com/s/bitter/v40/rax8HiqOu8IVPmn7f4xpLjpSmw.woff2 — 33.4 KiB — 15 ms — font-display: swaphttps://use.typekit.net/af/63a8e1/00000000000000007735a815/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/63a8e1/00000000000000007735a815/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 22.6 KiB — 17 ms — font-display: swaphttps://use.typekit.net/af/02cde8/00000000000000007735a7f7/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i3&v=3l https://use.typekit.net/af/02cde8/00000000000000007735a7f7/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i3&v=3 — 23.1 KiB — 15 ms — font-display: swaphttps://use.typekit.net/af/45ecb0/00000000000000007735a7e3/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/45ecb0/00000000000000007735a7e3/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 22.4 KiB — 18 ms — font-display: swap
font-woff;charset=utf-8... woff swap
Size 2 KB
Load time 156 ms
Start 225 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
l woff2 swap
Size 22 KB
Load time 11 ms
Start 319 ms
Risk FOUT — text flashes from fallback to web font
rax8HiqOu8IVPmn7f4xpLjp... woff2 swap
Size 33 KB
Load time 15 ms
Start 319 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 23 KB
Load time 17 ms
Start 319 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 23 KB
Load time 15 ms
Start 320 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 22 KB
Load time 18 ms
Start 320 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
96 requests over 2845ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.0 s LCP 1.3 shttps://ala.org// https://ala.org/ — 301 — 206 B — 20 ms — h2https://www.ala.org/www.ala.org/ https://www.ala.org/ — 200 — 31.4 KiB — 28 ms — h2https://www.ala.org/sites/default/files/css/css_eqCsXtjO-JgYGXET4wR1XvAZwO8OnU4LjLktiQvqfyQ.css?delta=0&language=en&theme=ala&include=eJxNjmsOgzAMgy_U0iOhtM2gEJoqScXY6aexB_tjfbYsy5CzMdQjwAeGm3A1BwRhIo5AJzYQmATa7L0dDb1PXY03T6WuejZ0Lw1lOc0YQTG85HIbqsKE6tKKuRjLWGrGapE4reGPXWLBkKU3oAEWuL-DyrIBlQc6goO7jbEXyijBdk5Mo2KywtX9nup340qGXluPVHTG7PRQw-18-QQr12UWwww.ala.org/sites/default/files/css... https://www.ala.org/sites/default/files/css/css_eqCsXtjO-JgYGXET4wR1XvAZwO8OnU4LjLktiQvqfyQ.css?delta=0&language=en&theme=ala&include=eJxNjmsOgzAMgy_U0iOhtM2gEJoqScXY6aexB_tjfbYsy5CzMdQjwAeGm3A1BwRhIo5AJzYQmATa7L0dDb1PXY03T6WuejZ0Lw1lOc0YQTG85HIbqsKE6tKKuRjLWGrGapE4reGPXWLBkKU3oAEWuL-DyrIBlQc6goO7jbEXyijBdk5Mo2KywtX9nup340qGXluPVHTG7PRQw-18-QQr12UW — 200 — 2.3 KiB — 22 ms — h2https://www.ala.org/sites/default/files/css/css_PQygCq59F1HS8-gqwiJ4rp-cntjyDT3qjr_AQYuARGU.css?delta=1&language=en&theme=ala&include=eJxNjmsOgzAMgy_U0iOhtM2gEJoqScXY6aexB_tjfbYsy5CzMdQjwAeGm3A1BwRhIo5AJzYQmATa7L0dDb1PXY03T6WuejZ0Lw1lOc0YQTG85HIbqsKE6tKKuRjLWGrGapE4reGPXWLBkKU3oAEWuL-DyrIBlQc6goO7jbEXyijBdk5Mo2KywtX9nup340qGXluPVHTG7PRQw-18-QQr12UWwww.ala.org/sites/default/files/css... https://www.ala.org/sites/default/files/css/css_PQygCq59F1HS8-gqwiJ4rp-cntjyDT3qjr_AQYuARGU.css?delta=1&language=en&theme=ala&include=eJxNjmsOgzAMgy_U0iOhtM2gEJoqScXY6aexB_tjfbYsy5CzMdQjwAeGm3A1BwRhIo5AJzYQmATa7L0dDb1PXY03T6WuejZ0Lw1lOc0YQTG85HIbqsKE6tKKuRjLWGrGapE4reGPXWLBkKU3oAEWuL-DyrIBlQc6goO7jbEXyijBdk5Mo2KywtX9nup340qGXluPVHTG7PRQw-18-QQr12UW — 200 — 43.8 KiB — 33 ms — h2https://www.ala.org/sites/default/files/js/js_NhnB-mPnYFLm0wXapvstfan2zQUvUYFg-Fi2v1Ik8iI.js?scope=header&delta=0&language=en&theme=ala&include=eJxdjEEOgCAMBD-E8iSyUGw0lZrCQX8vMRzUy2ZmDguipiiXx4B5MS3NQeAhx1rytNXHEiQXgk1VVso2mlF9BxaNkAcbYkj9Cv3DHKuy5NDAnvv8fcaG8xv3G9DMOokwww.ala.org/sites/default/files/js/... https://www.ala.org/sites/default/files/js/js_NhnB-mPnYFLm0wXapvstfan2zQUvUYFg-Fi2v1Ik8iI.js?scope=header&delta=0&language=en&theme=ala&include=eJxdjEEOgCAMBD-E8iSyUGw0lZrCQX8vMRzUy2ZmDguipiiXx4B5MS3NQeAhx1rytNXHEiQXgk1VVso2mlF9BxaNkAcbYkj9Cv3DHKuy5NDAnvv8fcaG8xv3G9DMOok — 200 — 642 B — 30 ms — h2https://www.ala.org/modules/contrib/google_tag/js/gtag.js?tdtaihwww.ala.org/modules/contrib/google_... https://www.ala.org/modules/contrib/google_tag/js/gtag.js?tdtaih — 200 — 909 B — 27 ms — h2https://www.ala.org/modules/contrib/google_tag/js/gtm.js?tdtaihwww.ala.org/modules/contrib/google_... https://www.ala.org/modules/contrib/google_tag/js/gtm.js?tdtaih — 200 — 959 B — 24 ms — h2https://fonts.googleapis.com/css2?family=Bitter:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500;1,600;1,700&display=swapfonts.googleapis.com/css2?family=Bi... https://fonts.googleapis.com/css2?family=Bitter:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500;1,600;1,700&display=swap — 200 — 1.2 KiB — 124 ms — h2https://use.typekit.net/hww8zbp.cssuse.typekit.net/hww8zbp.css https://use.typekit.net/hww8zbp.css — 200 — 1.1 KiB — 20 ms — h2https://www.ala.org/themes/custom/ala/logo.svgwww.ala.org/themes/custom/ala/logo.... https://www.ala.org/themes/custom/ala/logo.svg — 200 — 2.8 KiB — 26 ms — h2https://www.ala.org/sites/default/files/styles/card_image_681x559/public/2026-04/for-ala-homepage3.jpg.webp?h=fcc9ac4b&itok=9aP10R8ywww.ala.org/sites/default/files/sty... https://www.ala.org/sites/default/files/styles/card_image_681x559/public/2026-04/for-ala-homepage3.jpg.webp?h=fcc9ac4b&itok=9aP10R8y — 200 — 84.3 KiB — 154 ms — 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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 897ms · 474KB · €10/mo
www.ala.org
Other
Costly
Execution 295ms
Transfer 31 KB
Monthly Cost €3/mo
Unattributable
Other
Optional
Execution 192ms
Transfer 0 KB
Monthly Cost €2/mo
cookie-cdn.cookiepro.com
Other
Optional
Execution 120ms
Transfer 89 KB
Unused 51%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 117ms
Transfer 176 KB
Unused 40%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 95ms
Transfer 138 KB
Unused 49%
Monthly Cost €1/mo
www.ala.org
Other
Optional
Execution 78ms
Transfer 40 KB
Unused 75%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.ala.org adds 295ms 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.ala.org takes 295ms 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

51% of cookie-cdn.cookiepro.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

75% of www.ala.org'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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