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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
38
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.
100
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.

5.69 s

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

10.10 s

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

1.12 s

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

0.026

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

5.69 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.

12.72 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
17
8 PASS 2 REVIEW 5 FIX
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 (1.5 MiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3365ms total JS execution
FIX
3365ms total JS execution
Warning::
https://www.lanl.gov/_next/static/chunks/0mr30_9h4...: 799ms CPU time
Warning::
https://www.lanl.gov/: 698ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-WD09...: 440ms CPU time
Warning::
Unattributable: 436ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 357ms CPU time
Warning::
Third-party scripts: 3365ms (100% of total)

Main Thread Breakdown

Script Evaluation 53% Script Parsing & Compilation 15% Other 14% Style & Layout 12%
ScriptTotalScriptingParse/CompileParty
https://www.lanl.gov/_next/static/chunks/0mr30_9h44kxm.js799ms741ms30ms3rd
https://www.lanl.gov/698ms24ms54ms3rd
https://www.googletagmanager.com/gtag/js?id=G-WD0986RWM9&cx=c&gtm=4e64k0440ms364ms70ms3rd
Unattributable436ms14ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L357ms296ms59ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WSKKL6N292ms225ms54ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64k092ms34ms57ms3rd
https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js84ms79ms2ms3rd
https://www.lanl.gov/_next/static/chunks/09r11lnei.a48.js58ms1ms56ms3rd
https://www.lanl.gov/_next/static/chunks/0lo4p4.f6y6wl.js57ms1ms55ms3rd

Showing top 10 of 11 scripts

F
JS Bundles
Action
19 scripts, 620 KB unused
FIX
19 scripts, 620 KB unused
Warning::
https://www.lanl.gov/_next/static/chunks/0lo4p4.f6...: 131 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 106 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.lanl.gov/_next/static/chunks/09r11lnei...: 76 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-WD09...: 63 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 62 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 620 KB
620 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.lanl.gov/_next/static/chunks/0lo4p4.f6y6wl.js132 KB131 KB (100%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64k0147 KB106 KB (72%)✓3rd
https://www.lanl.gov/_next/static/chunks/09r11lnei.a48.js133 KB76 KB (57%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-WD0986RWM9&cx=c&gtm=4e64k0160 KB63 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB62 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WSKKL6N129 KB61 KB (47%)✓3rd
https://www.lanl.gov/_next/static/chunks/03e4iw5~sma3b.js79 KB52 KB (66%)✓3rd
https://www.lanl.gov/_next/static/chunks/0mr30_9h44kxm.js71 KB26 KB (37%)✓3rd
https://www.lanl.gov/_next/static/chunks/0kvv9024-cy43.js29 KB23 KB (79%)✓3rd
https://www.lanl.gov/_next/static/chunks/0fpgzu31bgie5.js37 KB21 KB (57%)✓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
47 resources · 1.5 MB · 620 KB savings available
FIX
47 resources · 1.5 MB · 620 KB savings available
Warning::
Page weight 532 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~620 KB of savings available
Warning::
46 third-party resources (100% of weight)
47 resources · 1.5 MiB · 46 third-party 532.1 KiB over 1MB target
JavaScript 72% · 1.1 MiB
Font 11% · 169.1 KiB
Image 10% · 161.8 KiB
Document 3% · 53.8 KiB
CSS 3% · 44.0 KiB
Other 0% · 5.3 KiB

~619.8 KiB of savings available

Remove unused JavaScript: 619.8 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.

B
Page Weight Budget
1.5 MB transferred, 47 requests
REVIEW
1.5 MB transferred, 47 requests
Info::
Page weighs 4.3 MB (1.5 MB transferred)
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::
47 HTTP requests
Info::
Estimated 0.32 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
47 requests
0.32 g CO2 per page load
JavaScript 1.1 MiB 72%
Fonts 169.1 KiB 11%
Images 158.7 KiB 10%
HTML 53.7 KiB 3%
CSS 44.0 KiB 3%
Other 4.7 KiB 0%
Other 3.2 KiB 0%
Other 556 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

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
Image Optimization
9 images, 0 KB saveable
PASS
9 images, 0 KB saveable
Warning::
https://cdn.lanl.gov/optimized/lg/e619a3ae-cb04-4e... 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.
9 images 159 KB
0 oversized -0 KB
1 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

Performance issues directly impact user engagement and conversion rates.

A+
Font Loading
5 fonts (169 KB)
PASS
5 fonts (169 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

169 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 5.7 s LCP 10.1 shttps://www.lanl.gov/_next/static/media/source-sans-pro-latin-700.00kv4unk-rml0.woff2source-sans-pro-latin-7... https://www.lanl.gov/_next/static/media/source-sans-pro-latin-700.00kv4unk-rml0.woff2 — 84.3 KiB — 714 ms — font-display: swaphttps://www.lanl.gov/_next/static/media/source-sans-pro-latin-400.0p~.zhomsa_gy.woff2source-sans-pro-latin-4... https://www.lanl.gov/_next/static/media/source-sans-pro-latin-400.0p~.zhomsa_gy.woff2 — 16.3 KiB — 717 ms — font-display: swaphttps://use.typekit.net/af/ac1071/00000000000000003b9acafe/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n8&v=3l https://use.typekit.net/af/ac1071/00000000000000003b9acafe/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n8&v=3 — 26.3 KiB — 21 ms — font-display: swaphttps://www.lanl.gov/_next/static/media/source-sans-pro-latin-600.0h96lseama~~t.woff2source-sans-pro-latin-6... https://www.lanl.gov/_next/static/media/source-sans-pro-latin-600.0h96lseama~~t.woff2 — 16.2 KiB — 706 ms — font-display: swaphttps://use.typekit.net/af/6d4bb2/00000000000000003b9acafc/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/6d4bb2/00000000000000003b9acafc/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 26.0 KiB — 16 ms — font-display: swap
source-sans-pro-latin-7... woff2 swap
Size 84 KB
Load time 714 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
source-sans-pro-latin-4... woff2 swap
Size 16 KB
Load time 717 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 26 KB
Load time 21 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
source-sans-pro-latin-6... woff2 swap
Size 16 KB
Load time 706 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 26 KB
Load time 16 ms
Start 1.9 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)
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
5 hints, 0 missing preconnects
PASS
5 hints, 0 missing preconnects
Info::
Page uses 5 resource hint(s)

Current Resource Hints

preconnect
3
preload
2
dns-prefetch
—
prefetch
—

5 resource hints configured

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
47 requests over 3442ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 5.7 s LCP 10.1 shttps://lanl.gov// https://lanl.gov/ — 301 — 83 B — 687 ms — h2https://www.lanl.gov/www.lanl.gov/ https://www.lanl.gov/ — 200 — 53.7 KiB — 30 ms — h2https://cdn.lanl.gov/optimized/lg/b3d5f31c-b6d6-4a57-b705-251bdb7280f3_768.webpcdn.lanl.gov/optimized/lg/b3d5f31c-... https://cdn.lanl.gov/optimized/lg/b3d5f31c-b6d6-4a57-b705-251bdb7280f3_768.webp — 200 — 53.4 KiB — 254 ms — h2https://cdn.lanl.gov/optimized/lg/3c25eebd-e05c-49d6-b591-18c1106532b9_325.webpcdn.lanl.gov/optimized/lg/3c25eebd-... https://cdn.lanl.gov/optimized/lg/3c25eebd-e05c-49d6-b591-18c1106532b9_325.webp — 200 — 14.8 KiB — 251 ms — h2https://www.lanl.gov/_next/static/chunks/0s6zg9ydmeq0h.csswww.lanl.gov/_next/static/chunks/0s... https://www.lanl.gov/_next/static/chunks/0s6zg9ydmeq0h.css — 200 — 6.8 KiB — 686 ms — h2https://www.lanl.gov/_next/static/chunks/0wzl9~kl66oxk.csswww.lanl.gov/_next/static/chunks/0w... https://www.lanl.gov/_next/static/chunks/0wzl9~kl66oxk.css — 200 — 15.9 KiB — 700 ms — h2https://www.lanl.gov/_next/static/chunks/0pm32aoc8ykdp.csswww.lanl.gov/_next/static/chunks/0p... https://www.lanl.gov/_next/static/chunks/0pm32aoc8ykdp.css — 200 — 9.6 KiB — 735 ms — h2https://www.lanl.gov/_next/static/chunks/0j3m5e_hb14zq.csswww.lanl.gov/_next/static/chunks/0j... https://www.lanl.gov/_next/static/chunks/0j3m5e_hb14zq.css — 200 — 10.6 KiB — 687 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-WSKKL6Nwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-WSKKL6N — 200 — 128.6 KiB — 38 ms — h2https://cdn.lanl.gov/optimized/lg/07ed8bc4-7f69-43d9-a851-cd77b8440624_325.webpcdn.lanl.gov/optimized/lg/07ed8bc4-... https://cdn.lanl.gov/optimized/lg/07ed8bc4-7f69-43d9-a851-cd77b8440624_325.webp — 200 — 2.9 KiB — 243 ms — h2https://cdn.lanl.gov/optimized/lg/a715fcc8-cb23-420c-a47f-595873150c7e_325.webpcdn.lanl.gov/optimized/lg/a715fcc8-... https://cdn.lanl.gov/optimized/lg/a715fcc8-cb23-420c-a47f-595873150c7e_325.webp — 200 — 7.6 KiB — 242 ms — h2https://cdn.lanl.gov/optimized/lg/7c601cbc-054d-4583-91b4-8d5ac486a737_325.webpcdn.lanl.gov/optimized/lg/7c601cbc-... https://cdn.lanl.gov/optimized/lg/7c601cbc-054d-4583-91b4-8d5ac486a737_325.webp — 200 — 13.6 KiB — 242 ms — h2https://cdn.lanl.gov/optimized/lg/70a766de-0520-4c31-b4bb-c075450eafb3_325.webpcdn.lanl.gov/optimized/lg/70a766de-... https://cdn.lanl.gov/optimized/lg/70a766de-0520-4c31-b4bb-c075450eafb3_325.webp — 200 — 10.3 KiB — 247 ms — h2https://www.lanl.gov/_next/static/chunks/04dn2s-x-n~kg.jswww.lanl.gov/_next/static/chunks/04... https://www.lanl.gov/_next/static/chunks/04dn2s-x-n~kg.js — 200 — 8.2 KiB — 684 ms — h2https://www.lanl.gov/_next/static/chunks/0q57lbfsz.a5x.jswww.lanl.gov/_next/static/chunks/0q... https://www.lanl.gov/_next/static/chunks/0q57lbfsz.a5x.js — 200 — 12.6 KiB — 700 ms — h2https://www.lanl.gov/_next/static/chunks/0fpgzu31bgie5.jswww.lanl.gov/_next/static/chunks/0f... https://www.lanl.gov/_next/static/chunks/0fpgzu31bgie5.js — 200 — 37.4 KiB — 745 ms — h2https://www.lanl.gov/_next/static/chunks/0mr30_9h44kxm.jswww.lanl.gov/_next/static/chunks/0m... https://www.lanl.gov/_next/static/chunks/0mr30_9h44kxm.js — 200 — 71.3 KiB — 746 ms — h2https://www.lanl.gov/_next/static/chunks/turbopack-05ly3.k0x.rzq.jswww.lanl.gov/_next/static/chunks/tu... https://www.lanl.gov/_next/static/chunks/turbopack-05ly3.k0x.rzq.js — 200 — 4.7 KiB — 685 ms — h2https://www.lanl.gov/_next/static/chunks/0tl_fj5ex-oqm.jswww.lanl.gov/_next/static/chunks/0t... https://www.lanl.gov/_next/static/chunks/0tl_fj5ex-oqm.js — 200 — 3.2 KiB — 704 ms — h2https://www.lanl.gov/_next/static/chunks/03e4iw5~sma3b.jswww.lanl.gov/_next/static/chunks/03... https://www.lanl.gov/_next/static/chunks/03e4iw5~sma3b.js — 200 — 79.4 KiB — 740 ms — h2https://www.lanl.gov/_next/static/chunks/0eewamb49pw7k.jswww.lanl.gov/_next/static/chunks/0e... https://www.lanl.gov/_next/static/chunks/0eewamb49pw7k.js — 200 — 13.3 KiB — 703 ms — h2https://www.lanl.gov/_next/static/chunks/06-8wp1c~-~1t.jswww.lanl.gov/_next/static/chunks/06... https://www.lanl.gov/_next/static/chunks/06-8wp1c~-~1t.js — 200 — 741 B — 737 ms — h2https://www.lanl.gov/_next/static/chunks/09r11lnei.a48.jswww.lanl.gov/_next/static/chunks/09... https://www.lanl.gov/_next/static/chunks/09r11lnei.a48.js — 200 — 132.7 KiB — 727 ms — h2https://www.lanl.gov/_next/static/chunks/0kvv9024-cy43.jswww.lanl.gov/_next/static/chunks/0k... https://www.lanl.gov/_next/static/chunks/0kvv9024-cy43.js — 200 — 29.4 KiB — 731 ms — h2https://www.lanl.gov/_next/static/chunks/0_z51oxa.x0va.jswww.lanl.gov/_next/static/chunks/0_... https://www.lanl.gov/_next/static/chunks/0_z51oxa.x0va.js — 200 — 1.7 KiB — 705 ms — h2https://www.lanl.gov/_next/static/chunks/0lo4p4.f6y6wl.jswww.lanl.gov/_next/static/chunks/0l... https://www.lanl.gov/_next/static/chunks/0lo4p4.f6y6wl.js — 200 — 131.5 KiB — 1.6 s — h2https://use.typekit.net/zbj3hfy.cssuse.typekit.net/zbj3hfy.css https://use.typekit.net/zbj3hfy.css — 200 — 986 B — 28 ms — h2https://p.typekit.net/p.css?s=1&k=zbj3hfy&ht=tk&f=26034.26052.26053.26054&a=141406115&app=typekit&e=cssp.typekit.net/p.css?s=1&k=zbj3hfy&h... https://p.typekit.net/p.css?s=1&k=zbj3hfy&ht=tk&f=26034.26052.26053.26054&a=141406115&app=typekit&e=css — 200 — 172 B — 9 ms — h2https://www.lanl.gov/api/footerwww.lanl.gov/api/footer https://www.lanl.gov/api/footer — 200 — 1.3 KiB — 732 ms — h2https://www.googletagmanager.com/gtag/js?id=G-WD0986RWM9&cx=c&gtm=4e64k0www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-WD0986RWM9&cx=c&gtm=4e64k0 — 200 — 159.6 KiB — 26 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 5.7 s LCP 10.1 shttps://lanl.gov// https://lanl.gov/ — 301 — 83 B — 687 ms — h2https://www.lanl.gov/www.lanl.gov/ https://www.lanl.gov/ — 200 — 53.7 KiB — 30 ms — h2https://cdn.lanl.gov/optimized/lg/b3d5f31c-b6d6-4a57-b705-251bdb7280f3_768.webpcdn.lanl.gov/optimized/lg/b3d5f31c-... https://cdn.lanl.gov/optimized/lg/b3d5f31c-b6d6-4a57-b705-251bdb7280f3_768.webp — 200 — 53.4 KiB — 254 ms — h2https://cdn.lanl.gov/optimized/lg/3c25eebd-e05c-49d6-b591-18c1106532b9_325.webpcdn.lanl.gov/optimized/lg/3c25eebd-... https://cdn.lanl.gov/optimized/lg/3c25eebd-e05c-49d6-b591-18c1106532b9_325.webp — 200 — 14.8 KiB — 251 ms — h2https://www.lanl.gov/_next/static/chunks/0s6zg9ydmeq0h.csswww.lanl.gov/_next/static/chunks/0s... https://www.lanl.gov/_next/static/chunks/0s6zg9ydmeq0h.css — 200 — 6.8 KiB — 686 ms — h2https://www.lanl.gov/_next/static/chunks/0wzl9~kl66oxk.csswww.lanl.gov/_next/static/chunks/0w... https://www.lanl.gov/_next/static/chunks/0wzl9~kl66oxk.css — 200 — 15.9 KiB — 700 ms — h2https://www.lanl.gov/_next/static/chunks/0pm32aoc8ykdp.csswww.lanl.gov/_next/static/chunks/0p... https://www.lanl.gov/_next/static/chunks/0pm32aoc8ykdp.css — 200 — 9.6 KiB — 735 ms — h2https://www.lanl.gov/_next/static/chunks/0j3m5e_hb14zq.csswww.lanl.gov/_next/static/chunks/0j... https://www.lanl.gov/_next/static/chunks/0j3m5e_hb14zq.css — 200 — 10.6 KiB — 687 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-WSKKL6Nwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-WSKKL6N — 200 — 128.6 KiB — 38 ms — h2https://cdn.lanl.gov/optimized/lg/07ed8bc4-7f69-43d9-a851-cd77b8440624_325.webpcdn.lanl.gov/optimized/lg/07ed8bc4-... https://cdn.lanl.gov/optimized/lg/07ed8bc4-7f69-43d9-a851-cd77b8440624_325.webp — 200 — 2.9 KiB — 243 ms — h2https://cdn.lanl.gov/optimized/lg/a715fcc8-cb23-420c-a47f-595873150c7e_325.webpcdn.lanl.gov/optimized/lg/a715fcc8-... 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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 3365ms · 985KB · $45/mo
www.lanl.gov
Other
Costly
Execution 799ms
Transfer 71 KB
Unused 37%
Monthly Cost $11/mo
www.lanl.gov
Other
Costly
Execution 698ms
Transfer 54 KB
Monthly Cost $9/mo
Google Tag Manager
Tag Manager
Costly
Execution 440ms
Transfer 160 KB
Unused 40%
Monthly Cost $6/mo
Unattributable
Other
Costly
Execution 436ms
Transfer 0 KB
Monthly Cost $6/mo
Google Tag Manager
Tag Manager
Costly
Execution 357ms
Transfer 147 KB
Unused 42%
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 292ms
Transfer 129 KB
Unused 47%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Optional
Execution 92ms
Transfer 147 KB
Unused 72%
Monthly Cost $1/mo
dap.digitalgov.gov
Other
Optional
Execution 84ms
Transfer 4 KB
Monthly Cost $1/mo
www.lanl.gov
Other
Optional
Execution 58ms
Transfer 133 KB
Unused 57%
Monthly Cost $1/mo
www.lanl.gov
Other
Optional
Execution 57ms
Transfer 132 KB
Unused 100%
Monthly Cost $1/mo
dap.digitalgov.gov
Other
Optional
Execution 52ms
Transfer 9 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.lanl.gov adds 799ms and costs ~$11/month
  • www.lanl.gov adds 698ms and costs ~$9/month
  • Google Tag Manager adds 440ms and costs ~$6/month
  • Unattributable adds 436ms and costs ~$6/month
  • Google Tag Manager adds 357ms and costs ~$5/month
  • Google Tag Manager adds 292ms and costs ~$4/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.lanl.gov takes 799ms 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.lanl.gov takes 698ms 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 440ms 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 436ms 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 357ms 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 292ms 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

72% of Google Tag Manager'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

57% of www.lanl.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

100% of www.lanl.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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