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https://llnl.gov

Performance

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

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

Mobile Desktop
36
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

8.80 s

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

27.21 s

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

886 ms

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

0.003

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

8.80 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.

27.39 s

Page Load Progression

410 ms
819 ms
1.2 s
1.6 s
2.0 s
2.5 s
2.9 s
3.3 s
Checks
17
7 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
4.8 MB transferred, 85 requests
FIX
4.8 MB transferred, 85 requests
Critical::
Page weighs 12.3 MB (4.8 MB transferred)
Warning::
Images are 2.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.5 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 822 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 822 KB
Info::
CSS is 279 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 279 KB
Info::
85 HTTP requests
Info::
Estimated 1.0 g CO2 per page load
4.8 MB / 2.4 MB budget
4.8 MB transferred
85 requests
1.0 g CO2 per page load
Images 2.5 MiB 52%
JavaScript 1.1 MiB 23%
Fonts 822.0 KiB 17%
CSS 279.0 KiB 6%
HTML 132.4 KiB 3%
Other 2.0 KiB 0%
Other 1.3 KiB 0%
Other 665 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

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

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 (4.8 MiB of 4.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4271ms total JS execution
FIX
4271ms total JS execution
Warning::
https://www.llnl.gov/: 1453ms CPU time
Warning::
Unattributable: 1007ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 644ms CPU time
Warning::
https://www.llnl.gov/sites/www/files/js/js_MEw8oE9...: 641ms CPU time
Info::
https://www.llnl.gov/sites/www/files/js/js_k8oXBMl...: 160ms CPU time
Warning::
Third-party scripts: 4271ms (100% of total)

Main Thread Breakdown

Script Evaluation 30% Other 26% Style & Layout 23% Rendering 7% Parse HTML & CSS 6% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://www.llnl.gov/1453ms6ms4ms3rd
Unattributable1007ms7ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L644ms561ms73ms3rd
https://www.llnl.gov/sites/www/files/js/js_MEw8oE9xi3neG9cgAsKjwho3FHhXukrcADmeP8PWbs0.js?scope=footer&delta=0&language=en&theme=sienna&include=eJxlkFFywzAIRC-kWEfSYIk4ODJoAMXJ7es2tetpvtC-XZgdgRl6Ip4xu2icbcgOyRXynXgK8GGv65oUCxpNHEYRty3c4vFKTXFbID-ZTZo8UE_ERapTC1kUY9HeoA6FoMo0wAzPgE-vxPfd-pWhVq4JqqOCk7DFl3TvI16Owj-JLOzInm59jIyrvakhaL7F9-gUFK1tN-iBaUHu8Z8ejrbBCJkhAkN9OWXbwXVLoH6Hd7LgBGetwEWWy7i1m1Q6l93othYLK45X0SX9fcwH-QJlRaXU641ms476ms101ms3rd
https://www.llnl.gov/sites/www/files/js/js_k8oXBMlzypWW_AQwngBnyY54k4NQ1OjSMji7E8hppr8.js?scope=footer&delta=2&language=en&theme=sienna&include=eJxlkFFywzAIRC-kWEfSYIk4ODJoAMXJ7es2tetpvtC-XZgdgRl6Ip4xu2icbcgOyRXynXgK8GGv65oUCxpNHEYRty3c4vFKTXFbID-ZTZo8UE_ERapTC1kUY9HeoA6FoMo0wAzPgE-vxPfd-pWhVq4JqqOCk7DFl3TvI16Owj-JLOzInm59jIyrvakhaL7F9-gUFK1tN-iBaUHu8Z8ejrbBCJkhAkN9OWXbwXVLoH6Hd7LgBGetwEWWy7i1m1Q6l93othYLK45X0SX9fcwH-QJlRaXU160ms55ms17ms3rd
https://www.llnl.gov/sites/www/files/css/css_1hneLw5EaXrWX7-Y2sIa3W4nTldQTzXrwYKkpCP5D3I.css?delta=0&language=en&theme=sienna&include=eJyFUtFu2zAM_CEtGgoM2N8QlM3YbCTREKk4-fvSTbNiq7A-GTqdqbvjoSoZcH2lyaTFSfWUREyt4QbdOLMxacCvtAmbdKUMqZtJBaObDXlSjaqtPUGlXWHDhUa8M8KZb6Q-qGxDAqH1RjMUmhkhZZkuQx4vMOFm7KIw81KLPw9DpqhRO-Zhftc1NLpSE0hYq1NXwpnrMuZJIbi-jK64-HBAs8ae1iHs7CFXsWEShRZ0zR08i9G9Z0DqvqBI4jwccWQIv37-fkQ6Ylxf_vP7PqFn6ItrqEMJd-nWk9vlmUTDJI3i3PqG-YSvePsL8GVlWYLXI3O9PNGPY8i5ZvjoCHhJ4lGSB6qEbVrj49M5vO89CpVEs--uFQ-UWtiw4eJ1XfU5-xM59br1lFlXmkMj3aQqXwmOeOM_58_if89shJdNuNq3VLW7-1yCMtWK8dg7tR_7vj-RrvusQe9exRITKoWd0uEO_uiJX5A3nO15Yw89ms0ms0ms3rd
https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js86ms82ms3ms3rd
https://www.llnl.gov/sites/www/files/css/css_4GgOo88JtCSUl2r1PteeXfdq8RXHLjH5VRSpKiuM3ZU.css?delta=2&language=en&theme=sienna&include=eJyFUtFu2zAM_CEtGgoM2N8QlM3YbCTREKk4-fvSTbNiq7A-GTqdqbvjoSoZcH2lyaTFSfWUREyt4QbdOLMxacCvtAmbdKUMqZtJBaObDXlSjaqtPUGlXWHDhUa8M8KZb6Q-qGxDAqH1RjMUmhkhZZkuQx4vMOFm7KIw81KLPw9DpqhRO-Zhftc1NLpSE0hYq1NXwpnrMuZJIbi-jK64-HBAs8ae1iHs7CFXsWEShRZ0zR08i9G9Z0DqvqBI4jwccWQIv37-fkQ6Ylxf_vP7PqFn6ItrqEMJd-nWk9vlmUTDJI3i3PqG-YSvePsL8GVlWYLXI3O9PNGPY8i5ZvjoCHhJ4lGSB6qEbVrj49M5vO89CpVEs--uFQ-UWtiw4eJ1XfU5-xM59br1lFlXmkMj3aQqXwmOeOM_58_if89shJdNuNq3VLW7-1yCMtWK8dg7tR_7vj-RrvusQe9exRITKoWd0uEO_uiJX5A3nO15Yw66ms0ms0ms3rd
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451666ms39ms5ms3rd
https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=DOE&subagency=LLNL&sdor=fda.gov&dclink=true58ms49ms8ms3rd
D
Page Weight Inventory
Action
85 resources · 4.8 MB · 186 KB savings available
FIX
85 resources · 4.8 MB · 186 KB savings available
Warning::
Page weight 3.8 MB over 1MB target
Got: 4.8 MB Expected: ≤ 1 MB
Info::
~186 KB of savings available
Warning::
84 third-party resources (100% of weight)
Info::
5 resources over 200KB
85 resources · 4.8 MiB · 84 third-party 3.8 MiB over 1MB target
Image 52% · 2.5 MiB
JavaScript 23% · 1.1 MiB
Font 17% · 822.0 KiB
CSS 6% · 279.0 KiB
Document 3% · 132.9 KiB
Other 0% · 1.4 KiB

~185.6 KiB of savings available

Remove unused JavaScript: 185.6 KiB
C
Image Optimization
Action
26 images, 0 KB saveable
REVIEW
26 images, 0 KB saveable
Warning::
https://www.llnl.gov/sites/www/files/styles/orig/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.llnl.gov/themes/custom/sienna/assets/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.llnl.gov/themes/custom/sienna/assets/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.llnl.gov/themes/custom/sienna/assets/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.llnl.gov/sites/www/files/styles/orig/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.llnl.gov/sites/www/files/styles/orig/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.llnl.gov/sites/www/files/styles/orig/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://contenthub.llnl.gov/sites/contenthub/files... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://contenthub.llnl.gov/sites/contenthub/files... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.llnl.gov/themes/custom/sienna/assets/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.llnl.gov/themes/custom/sienna/assets/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.llnl.gov/sites/www/files/styles/orig/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.llnl.gov/themes/custom/sienna/assets/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://contenthub.llnl.gov/sites/contenthub/files... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.llnl.gov/sites/www/files/styles/orig/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.llnl.gov/sites/www/files/styles/orig/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
26 images 2.5 MB
0 oversized -0 KB
24 legacy format
17 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

Performance issues directly impact user engagement and conversion rates.

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

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
JS Bundles
Action
20 scripts, 186 KB unused
REVIEW
20 scripts, 186 KB unused
Warning::
https://www.llnl.gov/sites/www/files/js/js_MEw8oE9...: 105 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 60 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.llnl.gov/sites/www/files/js/js_k8oXBMl...: 20 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 186 KB
186 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.llnl.gov/sites/www/files/js/js_MEw8oE9xi3neG9cgAsKjwho3FHhXukrcADmeP8PWbs0.js?scope=footer&delta=0&language=en&theme=sienna&include=eJxlkFFywzAIRC-kWEfSYIk4ODJoAMXJ7es2tetpvtC-XZgdgRl6Ip4xu2icbcgOyRXynXgK8GGv65oUCxpNHEYRty3c4vFKTXFbID-ZTZo8UE_ERapTC1kUY9HeoA6FoMo0wAzPgE-vxPfd-pWhVq4JqqOCk7DFl3TvI16Owj-JLOzInm59jIyrvakhaL7F9-gUFK1tN-iBaUHu8Z8ejrbBCJkhAkN9OWXbwXVLoH6Hd7LgBGetwEWWy7i1m1Q6l93othYLK45X0SX9fcwH-QJlRaXU155 KB105 KB (68%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB60 KB (41%)✓3rd
https://www.llnl.gov/sites/www/files/js/js_k8oXBMlzypWW_AQwngBnyY54k4NQ1OjSMji7E8hppr8.js?scope=footer&delta=2&language=en&theme=sienna&include=eJxlkFFywzAIRC-kWEfSYIk4ODJoAMXJ7es2tetpvtC-XZgdgRl6Ip4xu2icbcgOyRXynXgK8GGv65oUCxpNHEYRty3c4vFKTXFbID-ZTZo8UE_ERapTC1kUY9HeoA6FoMo0wAzPgE-vxPfd-pWhVq4JqqOCk7DFl3TvI16Owj-JLOzInm59jIyrvakhaL7F9-gUFK1tN-iBaUHu8Z8ejrbBCJkhAkN9OWXbwXVLoH6Hd7LgBGetwEWWy7i1m1Q6l93othYLK45X0SX9fcwH-QJlRaXU29 KB20 KB (69%)✓3rd
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=r78Drb0 KB—✓3rd
https://www.youtube.com/s/player/1bb6ee63/player_embed_es6.vflset/en_US/base.js0 KB—✓3rd
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da17715231245160 KB—✓3rd
https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.5f0apfZzpOA.2021.O/am=AAAABA/d=1/br=1/rs=AGKMywFg3MG1UeKh8ePjbhY_YEMv-NHjmA/m=root,base140 KB—✓3rd
https://www.youtube.com/s/player/1bb6ee63/player_embed_es6.vflset/en_US/base.js436 KB—✓3rd
https://www.youtube.com/iframe_api3 KB—✓3rd
https://static.doubleclick.net/instream/ad_status.js0 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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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

no-cache

DirectiveValueMeaning
no-cache—Cache but always revalidate first
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
9 fonts (822 KB)
PASS
9 fonts (822 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

822 KB total

Render-blocking

0

of 9

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 28.0 s FCP 8.8 s LCP 27.2 shttps://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://www.llnl.gov/themes/custom/sienna/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2sourcesanspro-regular-w... https://www.llnl.gov/themes/custom/sienna/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2 — 20.2 KiB — 724 ms — font-display: swaphttps://www.llnl.gov/themes/custom/sienna/fonts/OpenSans-Regular.ttfOpenSans-Regular.ttf https://www.llnl.gov/themes/custom/sienna/fonts/OpenSans-Regular.ttf — 76.6 KiB — 758 ms — font-display: swaphttps://www.llnl.gov/themes/custom/sienna/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2sourcesanspro-bold-webf... https://www.llnl.gov/themes/custom/sienna/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2 — 20.0 KiB — 647 ms — font-display: swaphttps://www.llnl.gov/themes/custom/sienna/fonts/OpenSans-Bold.ttfOpenSans-Bold.ttf https://www.llnl.gov/themes/custom/sienna/fonts/OpenSans-Bold.ttf — 74.4 KiB — 730 ms — font-display: swaphttps://www.llnl.gov/themes/custom/sienna/fonts/glyphicons-halflings-regular.woff2glyphicons-halflings-re... https://www.llnl.gov/themes/custom/sienna/fonts/glyphicons-halflings-regular.woff2 — 17.7 KiB — 715 ms — font-display: swaphttps://www.llnl.gov/themes/custom/sienna/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.llnl.gov/themes/custom/sienna/webfonts/fa-solid-900.woff2 — 253.5 KiB — 731 ms — font-display: swaphttps://www.llnl.gov/themes/custom/sienna/webfonts/fa-regular-400.woff2fa-regular-400.woff2 https://www.llnl.gov/themes/custom/sienna/webfonts/fa-regular-400.woff2 — 325.6 KiB — 755 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 0 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 25 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
sourcesanspro-regular-w... woff2 swap
Size 20 KB
Load time 724 ms
Start 2.0 s
Risk FOUT — text flashes from fallback to web font
OpenSans-Regular.ttf ttf swap
Size 77 KB
Load time 758 ms
Start 2.0 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
sourcesanspro-bold-webf... woff2 swap
Size 20 KB
Load time 647 ms
Start 2.0 s
Risk FOUT — text flashes from fallback to web font
OpenSans-Bold.ttf ttf swap
Size 74 KB
Load time 730 ms
Start 2.0 s
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 715 ms
Start 2.0 s
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 254 KB
Load time 731 ms
Start 2.2 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
fa-regular-400.woff2 woff2 swap
Size 326 KB
Load time 755 ms
Start 2.2 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
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 0 ms
Start 2.4 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 ~335 KB and ~670 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
85 requests over 7616ms
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 FCP 8.8 s LCP 27.2 shttps://llnl.gov// https://llnl.gov/ — 301 — 194 B — 695 ms — http/1.0https://www.llnl.gov/www.llnl.gov/ https://www.llnl.gov/ — 200 — 22.8 KiB — 177 ms — h2https://www.llnl.gov/sites/www/files/css/css_1hneLw5EaXrWX7-Y2sIa3W4nTldQTzXrwYKkpCP5D3I.css?delta=0&language=en&theme=sienna&include=eJyFUtFu2zAM_CEtGgoM2N8QlM3YbCTREKk4-fvSTbNiq7A-GTqdqbvjoSoZcH2lyaTFSfWUREyt4QbdOLMxacCvtAmbdKUMqZtJBaObDXlSjaqtPUGlXWHDhUa8M8KZb6Q-qGxDAqH1RjMUmhkhZZkuQx4vMOFm7KIw81KLPw9DpqhRO-Zhftc1NLpSE0hYq1NXwpnrMuZJIbi-jK64-HBAs8ae1iHs7CFXsWEShRZ0zR08i9G9Z0DqvqBI4jwccWQIv37-fkQ6Ylxf_vP7PqFn6ItrqEMJd-nWk9vlmUTDJI3i3PqG-YSvePsL8GVlWYLXI3O9PNGPY8i5ZvjoCHhJ4lGSB6qEbVrj49M5vO89CpVEs--uFQ-UWtiw4eJ1XfU5-xM59br1lFlXmkMj3aQqXwmOeOM_58_if89shJdNuNq3VLW7-1yCMtWK8dg7tR_7vj-RrvusQe9exRITKoWd0uEO_uiJX5A3nO15Ywwww.llnl.gov/sites/www/files/css/cs... 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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 4271ms · 505KB · $57/mo
www.llnl.gov
Other
Costly
Execution 1453ms
Transfer 23 KB
Monthly Cost $19/mo
Unattributable
Other
Costly
Execution 1007ms
Transfer 0 KB
Monthly Cost $13/mo
Google Tag Manager
Tag Manager
Costly
Execution 644ms
Transfer 147 KB
Unused 41%
Monthly Cost $9/mo
www.llnl.gov
Other
Costly
Execution 641ms
Transfer 155 KB
Unused 68%
Monthly Cost $9/mo
www.llnl.gov
Other
Optional
Execution 160ms
Transfer 29 KB
Unused 69%
Monthly Cost $2/mo
www.llnl.gov
Other
Optional
Execution 89ms
Transfer 86 KB
Monthly Cost $1/mo
dap.digitalgov.gov
Other
Optional
Execution 86ms
Transfer 4 KB
Monthly Cost $1/mo
www.llnl.gov
Other
Optional
Execution 66ms
Transfer 51 KB
Monthly Cost $1/mo
static.cloudflareinsights.com
Other
Optional
Execution 66ms
Transfer 0 KB
Monthly Cost $1/mo
dap.digitalgov.gov
Other
Optional
Execution 58ms
Transfer 9 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.llnl.gov adds 1453ms and costs ~$19/month
  • Unattributable adds 1007ms and costs ~$13/month
  • Google Tag Manager adds 644ms and costs ~$9/month
  • www.llnl.gov adds 641ms and costs ~$9/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.llnl.gov takes 1453ms 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 1007ms 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 644ms 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.llnl.gov takes 641ms 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

68% of www.llnl.gov'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

69% of www.llnl.gov'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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