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https://lanl.gov

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
92
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.

1.09 s

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

1.61 s

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

46 ms

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

0.010

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

1.18 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.

2.25 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
6 PASS 3 REVIEW 4 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 (1.9 MiB of 1.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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...: 75 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-WD09...: 64 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 63 KB unused (43%)
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.js131 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 KB75 KB (57%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-WD0986RWM9&cx=c&gtm=4e64k0160 KB64 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB63 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WSKKL6N129 KB61 KB (48%)✓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 (36%)✓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
53 resources · 1.9 MB · 620 KB savings available
FIX
53 resources · 1.9 MB · 620 KB savings available
Warning::
Page weight 897 KB over 1MB target
Got: 1.9 MB Expected: ≤ 1 MB
Info::
~620 KB of savings available
Warning::
52 third-party resources (100% of weight)
53 resources · 1.9 MiB · 52 third-party 896.7 KiB over 1MB target
JavaScript 58% · 1.1 MiB
Image 27% · 527.5 KiB
Font 9% · 169.1 KiB
Document 3% · 53.8 KiB
CSS 2% · 44.0 KiB
Other 0% · 4.2 KiB

~620.2 KiB of savings available

Remove unused JavaScript: 620.2 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
Page Weight Budget
Action
1.9 MB transferred, 53 requests
REVIEW
1.9 MB transferred, 53 requests
Info::
Page weighs 4.6 MB (1.9 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::
53 HTTP requests
Info::
Estimated 0.39 g CO2 per page load
1.9 MB / 2.4 MB budget
1.9 MB transferred
53 requests
0.39 g CO2 per page load
JavaScript 1.1 MiB 58%
Images 524.3 KiB 27%
Fonts 169.1 KiB 9%
HTML 53.7 KiB 3%
CSS 44.0 KiB 2%
Other 3.7 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

B
JS Execution Cost
731ms total JS execution
REVIEW
731ms total JS execution
Info::
https://www.lanl.gov/: 175ms CPU time
Info::
https://www.lanl.gov/_next/static/chunks/0mr30_9h4...: 145ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-WD09...: 98ms CPU time
Info::
Unattributable: 92ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 77ms CPU time
Warning::
Third-party scripts: 731ms (100% of total)

Main Thread Breakdown

Script Evaluation 53% Script Parsing & Compilation 18% Other 13% Style & Layout 10%
ScriptTotalScriptingParse/CompileParty
https://www.lanl.gov/175ms12ms19ms3rd
https://www.lanl.gov/_next/static/chunks/0mr30_9h44kxm.js145ms127ms12ms3rd
https://www.googletagmanager.com/gtag/js?id=G-WD0986RWM9&cx=c&gtm=4e64k098ms76ms20ms3rd
Unattributable92ms4ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L77ms62ms15ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WSKKL6N75ms60ms13ms3rd
https://www.lanl.gov/_next/static/chunks/04dn2s-x-n~kg.js68ms68ms1ms3rd
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
15 images, 0 KB saveable
PASS
15 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.
15 images 524 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 500 ms 1.0 s 1.5 s FCP 1.1 s LCP 1.6 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 — 25 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 — 18 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 — 35 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 — 20 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 — 61 ms — font-display: swap
source-sans-pro-latin-7... woff2 swap
Size 84 KB
Load time 25 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
source-sans-pro-latin-4... woff2 swap
Size 16 KB
Load time 18 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 26 KB
Load time 35 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
source-sans-pro-latin-6... woff2 swap
Size 16 KB
Load time 20 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 26 KB
Load time 61 ms
Start 1.1 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
53 requests over 2027ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.1 s LCP 1.6 shttps://lanl.gov// https://lanl.gov/ — 301 — 83 B — 692 ms — h2https://www.lanl.gov/www.lanl.gov/ https://www.lanl.gov/ — 200 — 53.7 KiB — 31 ms — h2https://cdn.lanl.gov/optimized/lg/b3d5f31c-b6d6-4a57-b705-251bdb7280f3_1024.webpcdn.lanl.gov/optimized/lg/b3d5f31c-... https://cdn.lanl.gov/optimized/lg/b3d5f31c-b6d6-4a57-b705-251bdb7280f3_1024.webp — 200 — 77.8 KiB — 253 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 — 244 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 — 20 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 — 20 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 — 22 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 — 26 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 — 65 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 — 244 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 — 243 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 — 49 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 — 40 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 — 51 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 — 53 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 — 39 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 — 48 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 — 57 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 — 39 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 — 744 B — 30 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 — 62 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 — 35 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 — 46 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 — 131.3 KiB — 72 ms — h2https://use.typekit.net/zbj3hfy.cssuse.typekit.net/zbj3hfy.css https://use.typekit.net/zbj3hfy.css — 200 — 987 B — 68 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 — 23 ms — h2https://cdn.lanl.gov/optimized/lg/e619a3ae-cb04-4e6d-b931-d7cc8573a12f_1440.webpcdn.lanl.gov/optimized/lg/e619a3ae-... https://cdn.lanl.gov/optimized/lg/e619a3ae-cb04-4e6d-b931-d7cc8573a12f_1440.webp — 200 — 55.7 KiB — 743 ms — h2https://cdn.lanl.gov/optimized/lg/55e5b016-247f-4678-af90-a5bd0a98ef9d_1440.webpcdn.lanl.gov/optimized/lg/55e5b016-... https://cdn.lanl.gov/optimized/lg/55e5b016-247f-4678-af90-a5bd0a98ef9d_1440.webp — 200 — 75.4 KiB — 541 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.1 s LCP 1.6 shttps://lanl.gov// https://lanl.gov/ — 301 — 83 B — 692 ms — h2https://www.lanl.gov/www.lanl.gov/ https://www.lanl.gov/ — 200 — 53.7 KiB — 31 ms — h2https://cdn.lanl.gov/optimized/lg/b3d5f31c-b6d6-4a57-b705-251bdb7280f3_1024.webpcdn.lanl.gov/optimized/lg/b3d5f31c-... https://cdn.lanl.gov/optimized/lg/b3d5f31c-b6d6-4a57-b705-251bdb7280f3_1024.webp — 200 — 77.8 KiB — 253 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 — 244 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 — 20 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 — 20 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 — 22 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 — 26 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 — 65 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 — 244 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 — 243 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 — 49 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 — 40 ms — h2https://www.lanl.gov/_next/static/chunks/0fpgzu31bgie5.jswww.lanl.gov/_next/static/chunks/0f... 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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 731ms · 568KB · $10/mo
www.lanl.gov
Other
Optional
Execution 175ms
Transfer 54 KB
Monthly Cost $2/mo
www.lanl.gov
Other
Optional
Execution 145ms
Transfer 71 KB
Unused 36%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 98ms
Transfer 160 KB
Unused 40%
Monthly Cost $1/mo
Unattributable
Other
Optional
Execution 92ms
Transfer 0 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 77ms
Transfer 147 KB
Unused 43%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 75ms
Transfer 129 KB
Unused 48%
Monthly Cost $1/mo
www.lanl.gov
Other
Optional
Execution 68ms
Transfer 8 KB
Monthly Cost $1/mo

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

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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