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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
82
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

1.22 s

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

1.74 s

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

124 ms

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

0.051

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

2.63 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.

3.54 s

Page Load Progression

2.4 s
4.7 s
7.1 s
9.5 s
11.9 s
14.2 s
16.6 s
19.0 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
55.6 MB transferred, 99 requests
FIX
55.6 MB transferred, 99 requests
Critical::
Page weighs 68.4 MB (55.6 MB transferred)
Warning::
Images are 1.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.6 MB
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
Fonts are 456 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 456 KB
Info::
99 HTTP requests
Info::
Estimated 11.6 g CO2 per page load
55.6 MB / 2.4 MB budget
55.6 MB transferred
99 requests
11.6 g CO2 per page load
Other 52.3 MiB 94%
Images 1.6 MiB 3%
JavaScript 1.1 MiB 2%
Fonts 456.3 KiB 1%
CSS 84.9 KiB 0%
HTML 52.9 KiB 0%
Other 12.5 KiB 0%
Other 2.3 KiB 0%
Other 910 B 0%
Other 841 B 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

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 (55.6 MiB of 55.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
36 scripts, 437 KB unused
FIX
36 scripts, 437 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-YXS8...: 116 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/destination?...: 71 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.astm.org/_next/static/chunks/7273-57e2...: 67 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-54Z...: 61 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.astm.org/_next/static/chunks/4245-8988...: 58 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 437 KB
437 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-YXS8H95P3G&cx=c&gtm=4e64h1173 KB116 KB (67%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=G-YXS8H95P3G&cx=c&gtm=4e64h1174 KB71 KB (41%)✓3rd
https://www.astm.org/_next/static/chunks/7273-57e2012880982d18.js109 KB67 KB (62%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-54ZG9PKC153 KB61 KB (40%)✓3rd
https://www.astm.org/_next/static/chunks/4245-89881a608d3d3b37.js105 KB58 KB (56%)✓3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js57 KB38 KB (67%)✓3rd
https://www.astm.org/_next/static/chunks/992-e94673434af1789a.js58 KB26 KB (46%)✓3rd
https://www.astm.org/_next/static/chunks/app/layout-49b3769bb30c5179.js2 KB—✓3rd
https://www.astm.org/_next/static/chunks/1918-2c1929e041689eff.js5 KB—✓3rd
https://www.astm.org/_next/static/chunks/140bf7e7-0d5934ba9777d20e.js2 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

F
Page Weight Inventory
Action
99 resources · 55.6 MB · 437 KB savings available
FIX
99 resources · 55.6 MB · 437 KB savings available
Warning::
Page weight 54.6 MB over 1MB target
Got: 55.6 MB Expected: ≤ 1 MB
Info::
~437 KB of savings available
Warning::
98 third-party resources (100% of weight)
Info::
5 resources over 200KB
99 resources · 55.6 MiB · 98 third-party 54.6 MiB over 1MB target
Media 94% · 52.3 MiB
Image 3% · 1.6 MiB
JavaScript 2% · 1.1 MiB
Font 1% · 456.3 KiB
CSS 0% · 84.9 KiB
Document 0% · 52.9 KiB
Other 0% · 13.4 KiB

~437.0 KiB of savings available

Remove unused JavaScript: 437.0 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
15 images, 0 KB saveable
REVIEW
15 images, 0 KB saveable
Warning::
https://www.astm.org/v3/assets/blt5eb0a2cb04534832... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.astm.org/v3/assets/blt5eb0a2cb04534832... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.astm.org/v3/assets/blt5eb0a2cb04534832... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
15 images 1.6 MB
0 oversized -0 KB
14 legacy format
3 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

C
JS Execution Cost
Action
1331ms total JS execution
REVIEW
1331ms total JS execution
Warning::
Unattributable: 463ms CPU time
Info::
https://www.astm.org/_next/static/chunks/webpack-9...: 172ms CPU time
Info::
https://www.astm.org/_next/static/chunks/3131-221e...: 155ms CPU time
Info::
https://www.astm.org/: 153ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-54Z...: 93ms CPU time
Warning::
Third-party scripts: 1331ms (100% of total)

Main Thread Breakdown

Script Evaluation 47% Other 34% Script Parsing & Compilation 6% Style & Layout 5% Garbage Collection 3%
ScriptTotalScriptingParse/CompileParty
Unattributable463ms24ms0ms3rd
https://www.astm.org/_next/static/chunks/webpack-955ea9e689c54099.js172ms170ms0ms3rd
https://www.astm.org/_next/static/chunks/3131-221e6607f27d6926.js155ms132ms3ms3rd
https://www.astm.org/153ms11ms7ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-54ZG9PKC93ms69ms14ms3rd
https://www.googletagmanager.com/gtag/destination?id=G-YXS8H95P3G&cx=c&gtm=4e64h184ms73ms10ms3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js83ms68ms6ms3rd
https://www.astm.org/_next/static/chunks/c7879cf7-fabe25011515220e.js79ms46ms4ms3rd
https://www.astm.org/_next/static/chunks/992-e94673434af1789a.js50ms29ms5ms3rd
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
5 fonts (456 KB)
PASS
5 fonts (456 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

456 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.2 s LCP 1.7 shttps://use.typekit.net/af/404934/00000000000000007735bb2a/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/404934/00000000000000007735bb2a/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 34.9 KiB — 18 ms — font-display: swaphttps://www.astm.org/_next/static/media/fa-solid-900.1c1969ce.woff2fa-solid-900.1c1969ce.w... https://www.astm.org/_next/static/media/fa-solid-900.1c1969ce.woff2 — 139.0 KiB — 66 ms — font-display: swaphttps://use.typekit.net/af/98fb6b/00000000000000007735bb14/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/98fb6b/00000000000000007735bb14/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 35.9 KiB — 23 ms — font-display: swaphttps://www.astm.org/_next/static/media/fa-brands-400.5bc0fb2c.woff2fa-brands-400.5bc0fb2c.... https://www.astm.org/_next/static/media/fa-brands-400.5bc0fb2c.woff2 — 75.4 KiB — 68 ms — font-display: swaphttps://www.astm.org/_next/static/media/fa-regular-400.c432bd7d.woff2fa-regular-400.c432bd7d... https://www.astm.org/_next/static/media/fa-regular-400.c432bd7d.woff2 — 171.0 KiB — 562 ms — font-display: swap
l woff2 swap
Size 35 KB
Load time 18 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
fa-solid-900.1c1969ce.w... woff2 swap
Size 139 KB
Load time 66 ms
Start 1.2 s
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
l woff2 swap
Size 36 KB
Load time 23 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
fa-brands-400.5bc0fb2c.... woff2 swap
Size 75 KB
Load time 68 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
fa-regular-400.c432bd7d... woff2 swap
Size 171 KB
Load time 562 ms
Start 1.6 s
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
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 ~155 KB and ~310 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
99 requests over 34641ms
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 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s FCP 1.2 s LCP 1.7 shttps://astm.org// https://astm.org/ — 301 — 242 B — 131 ms — h2https://www.astm.org/www.astm.org/ https://www.astm.org/ — 200 — 52.9 KiB — 1.2 s — h2https://www.astm.org/_next/static/css/f1571eea04d057cb.csswww.astm.org/_next/static/css/f1571... https://www.astm.org/_next/static/css/f1571eea04d057cb.css — 200 — 13.4 KiB — 13 ms — h2https://www.astm.org/_next/static/css/2e2b0d5f8f450d37.csswww.astm.org/_next/static/css/2e2b0... https://www.astm.org/_next/static/css/2e2b0d5f8f450d37.css — 200 — 30.9 KiB — 31 ms — h2https://www.astm.org/_next/static/css/34711861f0d83b3b.csswww.astm.org/_next/static/css/34711... https://www.astm.org/_next/static/css/34711861f0d83b3b.css — 200 — 24.2 KiB — 34 ms — h2https://www.astm.org/_next/static/css/8a34cce2acce2524.csswww.astm.org/_next/static/css/8a34c... https://www.astm.org/_next/static/css/8a34cce2acce2524.css — 200 — 2.9 KiB — 21 ms — h2https://www.astm.org/_next/static/css/4dd16332ec3b022d.csswww.astm.org/_next/static/css/4dd16... https://www.astm.org/_next/static/css/4dd16332ec3b022d.css — 200 — 6.6 KiB — 20 ms — h2https://www.astm.org/_next/static/css/ccfdae096b1a1c74.csswww.astm.org/_next/static/css/ccfda... https://www.astm.org/_next/static/css/ccfdae096b1a1c74.css — 200 — 3.1 KiB — 21 ms — h2https://www.astm.org/_next/static/css/b363c8227c8926ce.csswww.astm.org/_next/static/css/b363c... https://www.astm.org/_next/static/css/b363c8227c8926ce.css — 200 — 623 B — 22 ms — h2https://www.astm.org/_next/static/css/0706ba86cf3aec90.csswww.astm.org/_next/static/css/0706b... https://www.astm.org/_next/static/css/0706ba86cf3aec90.css — 200 — 1.8 KiB — 25 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 113 ms — https://cdn.cookielaw.org/consent/b207a074-2cb8-4157-afef-451fd30e1c5a-test/OtAutoBlock.jscdn.cookielaw.org/consent/b207a074-... https://cdn.cookielaw.org/consent/b207a074-2cb8-4157-afef-451fd30e1c5a-test/OtAutoBlock.js — -1 — 0 B — 120 ms — https://www.googletagmanager.com/gtm.js?id=GTM-54ZG9PKCwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-54ZG9PKC — 200 — 152.7 KiB — 183 ms — h2https://use.typekit.net/bpp4kqc.cssuse.typekit.net/bpp4kqc.css https://use.typekit.net/bpp4kqc.css — 200 — 1.1 KiB — 73 ms — h2https://www.astm.org/images/logo/astm-header-logo.svgwww.astm.org/images/logo/astm-heade... https://www.astm.org/images/logo/astm-header-logo.svg — 200 — 3.5 KiB — 328 ms — h2https://www.astm.org/images/logo/astm-header-mobile-logo.svgwww.astm.org/images/logo/astm-heade... https://www.astm.org/images/logo/astm-header-mobile-logo.svg — 200 — 2.8 KiB — 345 ms — h2https://www.astm.org/_next/static/chunks/webpack-955ea9e689c54099.jswww.astm.org/_next/static/chunks/we... https://www.astm.org/_next/static/chunks/webpack-955ea9e689c54099.js — 200 — 2.4 KiB — 30 ms — h2https://www.astm.org/_next/static/chunks/c7879cf7-fabe25011515220e.jswww.astm.org/_next/static/chunks/c7... https://www.astm.org/_next/static/chunks/c7879cf7-fabe25011515220e.js — 200 — 53.7 KiB — 67 ms — h2https://www.astm.org/_next/static/chunks/3131-221e6607f27d6926.jswww.astm.org/_next/static/chunks/31... https://www.astm.org/_next/static/chunks/3131-221e6607f27d6926.js — 200 — 45.8 KiB — 63 ms — h2https://www.astm.org/_next/static/chunks/main-app-14ca3a7cef56c1a2.jswww.astm.org/_next/static/chunks/ma... https://www.astm.org/_next/static/chunks/main-app-14ca3a7cef56c1a2.js — 200 — 1.1 KiB — 34 ms — h2https://www.astm.org/_next/static/chunks/3134-0f6a40c051d2928c.jswww.astm.org/_next/static/chunks/31... https://www.astm.org/_next/static/chunks/3134-0f6a40c051d2928c.js — 200 — 4.0 KiB — 35 ms — h2https://www.astm.org/_next/static/chunks/app/%5B%5B...slug%5D%5D/not-found-a3a6d81a99412fd9.jswww.astm.org/_next/static/chunks/ap... https://www.astm.org/_next/static/chunks/app/%5B%5B...slug%5D%5D/not-found-a3a6d81a99412fd9.js — 200 — 1.3 KiB — 30 ms — h2https://www.astm.org/_next/static/chunks/140bf7e7-0d5934ba9777d20e.jswww.astm.org/_next/static/chunks/14... https://www.astm.org/_next/static/chunks/140bf7e7-0d5934ba9777d20e.js — 200 — 1.9 KiB — 37 ms — h2https://www.astm.org/_next/static/chunks/9104-e8dc01817d8cc499.jswww.astm.org/_next/static/chunks/91... https://www.astm.org/_next/static/chunks/9104-e8dc01817d8cc499.js — 200 — 7.0 KiB — 22 ms — h2https://www.astm.org/_next/static/chunks/7273-57e2012880982d18.jswww.astm.org/_next/static/chunks/72... https://www.astm.org/_next/static/chunks/7273-57e2012880982d18.js — 200 — 108.7 KiB — 45 ms — h2https://www.astm.org/_next/static/chunks/5247-b377b12005c3b713.jswww.astm.org/_next/static/chunks/52... 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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 1331ms · 596KB · $8/mo
Unattributable
Other
Costly
Execution 463ms
Transfer 0 KB
Monthly Cost $3/mo
www.astm.org
Other
Optional
Execution 172ms
Transfer 2 KB
Monthly Cost $1/mo
www.astm.org
Other
Optional
Execution 155ms
Transfer 46 KB
Monthly Cost $1/mo
www.astm.org
Other
Optional
Execution 153ms
Transfer 53 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 93ms
Transfer 153 KB
Unused 40%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 84ms
Transfer 174 KB
Unused 41%
Monthly Cost $0/mo
Hotjar
Session Replay
Optional
Execution 83ms
Transfer 57 KB
Unused 67%
Monthly Cost $0/mo
www.astm.org
Other
Optional
Execution 79ms
Transfer 54 KB
Monthly Cost $0/mo
www.astm.org
Other
Optional
Execution 50ms
Transfer 58 KB
Unused 46%
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • Unattributable adds 463ms and costs ~$3/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

Unattributable takes 463ms 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

67% of Hotjar'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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