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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
5
REVIEW
1
PASS
9
INFO
2

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

Mobile Desktop
44
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
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.

5.38 s

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

38.10 s

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

666 ms

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

0.024

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

6.18 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.

38.25 s

Page Load Progression

490 ms
979 ms
1.5 s
2.0 s
2.4 s
2.9 s
3.4 s
3.9 s
Checks
17
9 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
6.7 MB transferred, 106 requests
FIX
6.7 MB transferred, 106 requests
Critical::
Page weighs 9.9 MB (6.7 MB transferred)
Warning::
JavaScript is 865 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 865 KB
Info::
Fonts are 262 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 262 KB
Warning::
106 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.4 g CO2 per page load
6.7 MB / 2.4 MB budget
6.7 MB transferred
106 requests
1.4 g CO2 per page load
Other 4.6 MiB 68%
JavaScript 865.0 KiB 13%
Images 497.1 KiB 7%
Other 457.6 KiB 7%
Fonts 261.6 KiB 4%
CSS 63.6 KiB 1%
HTML 37.2 KiB 1%
Other 4.2 KiB 0%
Other 2.1 KiB 0%
Other 556 B 0%
0 2.4 MB 4.9 MB
Over budget

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

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 (6.7 MiB of 6.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2764ms total JS execution
FIX
2764ms total JS execution
Warning::
Unattributable: 642ms CPU time
Warning::
https://www.csis.org/: 572ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MNG...: 337ms CPU time
Warning::
https://www.csis.org/themes/custom/ts_csis/dist/au...: 307ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-0S87...: 282ms CPU time
Warning::
Third-party scripts: 2764ms (100% of total)

Main Thread Breakdown

Script Evaluation 46% Other 23% Style & Layout 18% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
Unattributable642ms145ms0ms3rd
https://www.csis.org/572ms8ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MNGQTH337ms289ms42ms3rd
https://www.csis.org/themes/custom/ts_csis/dist/audio-player.206e771d.js307ms213ms1ms3rd
https://www.googletagmanager.com/gtag/js?id=G-0S87RLF4Y6&cx=c&gtm=4e64h1282ms236ms44ms3rd
https://www.googletagmanager.com/gtag/js?id=G-PSYVZP8TWD&cx=c&gtm=4e64h1222ms181ms40ms3rd
https://www.csis.org/themes/custom/ts_csis/dist/department-hero.90a658d6.js209ms19ms6ms3rd
https://snap.licdn.com/li.lms-analytics/insight.min.js68ms45ms14ms3rd
https://www.csis.org/core/misc/drupal.init.js?v=10.5.967ms65ms0ms3rd
https://www.google-analytics.com/analytics.js58ms45ms5ms3rd
D
JS Bundles
Action
43 scripts, 311 KB unused
FIX
43 scripts, 311 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-0S87...: 69 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MNG...: 65 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-PSYV...: 65 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.jsdelivr.net/npm/c2pa@0.14.4/+esm: 51 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.jsdelivr.net/npm/c2pa-wc@0.10.15/+esm: 39 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 311 KB
311 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-0S87RLF4Y6&cx=c&gtm=4e64h1175 KB69 KB (40%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MNGQTH163 KB65 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-PSYVZP8TWD&cx=c&gtm=4e64h1152 KB65 KB (42%)✓3rd
https://cdn.jsdelivr.net/npm/c2pa@0.14.4/+esm78 KB51 KB (66%)✓3rd
https://cdn.jsdelivr.net/npm/c2pa-wc@0.10.15/+esm61 KB39 KB (65%)✓3rd
https://www.csis.org/themes/custom/ts_csis/node_modules/jquery/dist/jquery.min.js?tdlxol36 KB22 KB (63%)✓3rd
https://www.csis.org/core/misc/debounce.js?v=10.5.91 KB—✓3rd
https://www.csis.org/themes/custom/ts_csis/dist/audio-player.206e771d.js2 KB—✓3rd
https://www.csis.org/core/misc/drupal.init.js?v=10.5.91 KB—✓3rd
https://www.csis.org/core/assets/vendor/tabbable/index.umd.min.js?v=6.2.03 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

D
Page Weight Inventory
Action
106 resources · 6.7 MB · 311 KB savings available
FIX
106 resources · 6.7 MB · 311 KB savings available
Warning::
Page weight 5.7 MB over 1MB target
Got: 6.7 MB Expected: ≤ 1 MB
Info::
~311 KB of savings available
Warning::
105 third-party resources (100% of weight)
Info::
2 resources over 200KB
106 resources · 6.7 MiB · 105 third-party 5.7 MiB over 1MB target
Media 68% · 4.6 MiB
JavaScript 13% · 870.2 KiB
Image 7% · 497.8 KiB
Other 7% · 456.5 KiB
Font 4% · 261.6 KiB
CSS 1% · 63.6 KiB
Document 1% · 39.2 KiB

~311.4 KiB of savings available

Remove unused JavaScript: 311.4 KiB
B
Image Optimization
16 images, 0 KB saveable
REVIEW
16 images, 0 KB saveable
Warning::
https://www.csis.org/themes/custom/ts_csis/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
16 images 497 KB
0 oversized -0 KB
16 legacy format
1 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

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
7 fonts (262 KB)
PASS
7 fonts (262 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

262 KB total

Render-blocking

0

of 7

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 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s FCP 5.4 s LCP 38.1 shttps://use.typekit.net/af/eaa3cc/00000000000000007735dfd6/30/l?primer=7fa3915bdafdf03041871920a205bef951d72bf64dd4c4460fb992e3ecc3a862&fvd=n7&v=3l https://use.typekit.net/af/eaa3cc/00000000000000007735dfd6/30/l?primer=7fa3915bdafdf03041871920a205bef951d72bf64dd4c4460fb992e3ecc3a862&fvd=n7&v=3 — 17.3 KiB — 22 ms — font-display: swaphttps://use.typekit.net/af/34df33/00000000000000007735dfd0/30/l?primer=7fa3915bdafdf03041871920a205bef951d72bf64dd4c4460fb992e3ecc3a862&fvd=n4&v=3l https://use.typekit.net/af/34df33/00000000000000007735dfd0/30/l?primer=7fa3915bdafdf03041871920a205bef951d72bf64dd4c4460fb992e3ecc3a862&fvd=n4&v=3 — 16.9 KiB — 29 ms — font-display: swaphttps://www.csis.org/themes/custom/ts_csis/dist/PublicoHeadline-Bold-Web.4f7a1a3f.woff2PublicoHeadline-Bold-We... https://www.csis.org/themes/custom/ts_csis/dist/PublicoHeadline-Bold-Web.4f7a1a3f.woff2 — 44.5 KiB — 33 ms — font-display: swaphttps://www.csis.org/themes/custom/ts_csis/dist/PublicoHeadline-Extrabold-Web.873f05cc.woff2PublicoHeadline-Extrabo... https://www.csis.org/themes/custom/ts_csis/dist/PublicoHeadline-Extrabold-Web.873f05cc.woff2 — 36.4 KiB — 46 ms — font-display: swaphttps://www.csis.org/themes/custom/ts_csis/dist/PublicoText-Roman-Web.1d060a37.woff2PublicoText-Roman-Web.1... https://www.csis.org/themes/custom/ts_csis/dist/PublicoText-Roman-Web.1d060a37.woff2 — 51.6 KiB — 46 ms — font-display: swaphttps://www.csis.org/themes/custom/ts_csis/dist/PublicoHeadline-Medium-Web.935a1359.woff2PublicoHeadline-Medium-... https://www.csis.org/themes/custom/ts_csis/dist/PublicoHeadline-Medium-Web.935a1359.woff2 — 38.1 KiB — 46 ms — font-display: swaphttps://www.csis.org/themes/custom/ts_csis/dist/PublicoText-Bold-Web.367796fa.woff2PublicoText-Bold-Web.36... https://www.csis.org/themes/custom/ts_csis/dist/PublicoText-Bold-Web.367796fa.woff2 — 56.8 KiB — 35 ms — font-display: swap
l woff2 swap
Size 17 KB
Load time 22 ms
Start 366 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 17 KB
Load time 29 ms
Start 366 ms
Risk FOUT — text flashes from fallback to web font
PublicoHeadline-Bold-We... woff2 swap
Size 45 KB
Load time 33 ms
Start 366 ms
Risk FOUT — text flashes from fallback to web font
PublicoHeadline-Extrabo... woff2 swap
Size 36 KB
Load time 46 ms
Start 367 ms
Risk FOUT — text flashes from fallback to web font
PublicoText-Roman-Web.1... woff2 swap
Size 52 KB
Load time 46 ms
Start 367 ms
Risk FOUT — text flashes from fallback to web font
PublicoHeadline-Medium-... woff2 swap
Size 38 KB
Load time 46 ms
Start 367 ms
Risk FOUT — text flashes from fallback to web font
PublicoText-Bold-Web.36... woff2 swap
Size 57 KB
Load time 35 ms
Start 368 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

A
HTTP Caching
max-age=86400 (1 day)
PASS
max-age=86400 (1 day)
Info::
Cache-Control header is set
Got: public, max-age=86400
Info::
Effective TTL: 1 day (max-age=86400)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=86400

DirectiveValueMeaning
public—Any cache may store this response
max-age86400Cache for 1 day
Effective TTL: 86400 seconds
Network Waterfall
106 requests over 1602ms
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 38.0 s 40.0 s FCP 5.4 s LCP 38.1 shttps://csis.org// https://csis.org/ — 301 — 512 B — 73 ms — h2https://www.csis.org/www.csis.org/ https://www.csis.org/ — 200 — 37.2 KiB — 45 ms — h2https://www.csis.org/themes/composer/stable/css/system/components/align.module.css?tdlxolwww.csis.org/themes/composer/stable... https://www.csis.org/themes/composer/stable/css/system/components/align.module.css?tdlxol — 200 — 485 B — 37 ms — h2https://www.csis.org/themes/composer/stable/css/system/components/fieldgroup.module.css?tdlxolwww.csis.org/themes/composer/stable... https://www.csis.org/themes/composer/stable/css/system/components/fieldgroup.module.css?tdlxol — 200 — 390 B — 33 ms — h2https://www.csis.org/themes/composer/stable/css/system/components/container-inline.module.css?tdlxolwww.csis.org/themes/composer/stable... https://www.csis.org/themes/composer/stable/css/system/components/container-inline.module.css?tdlxol — 200 — 402 B — 35 ms — h2https://www.csis.org/themes/composer/stable/css/system/components/clearfix.module.css?tdlxolwww.csis.org/themes/composer/stable... https://www.csis.org/themes/composer/stable/css/system/components/clearfix.module.css?tdlxol — 200 — 518 B — 38 ms — h2https://www.csis.org/themes/composer/stable/css/system/components/details.module.css?tdlxolwww.csis.org/themes/composer/stable... https://www.csis.org/themes/composer/stable/css/system/components/details.module.css?tdlxol — 200 — 471 B — 33 ms — h2https://www.csis.org/themes/composer/stable/css/system/components/hidden.module.css?tdlxolwww.csis.org/themes/composer/stable... https://www.csis.org/themes/composer/stable/css/system/components/hidden.module.css?tdlxol — 200 — 998 B — 31 ms — h2https://www.csis.org/themes/composer/stable/css/system/components/item-list.module.css?tdlxolwww.csis.org/themes/composer/stable... https://www.csis.org/themes/composer/stable/css/system/components/item-list.module.css?tdlxol — 200 — 486 B — 40 ms — h2https://www.csis.org/themes/composer/stable/css/system/components/js.module.css?tdlxolwww.csis.org/themes/composer/stable... https://www.csis.org/themes/composer/stable/css/system/components/js.module.css?tdlxol — 200 — 503 B — 38 ms — h2https://www.csis.org/themes/composer/stable/css/system/components/nowrap.module.css?tdlxolwww.csis.org/themes/composer/stable... https://www.csis.org/themes/composer/stable/css/system/components/nowrap.module.css?tdlxol — 200 — 390 B — 35 ms — h2https://www.csis.org/themes/composer/stable/css/system/components/position-container.module.css?tdlxolwww.csis.org/themes/composer/stable... https://www.csis.org/themes/composer/stable/css/system/components/position-container.module.css?tdlxol — 200 — 360 B — 42 ms — h2https://www.csis.org/themes/composer/stable/css/system/components/reset-appearance.module.css?tdlxolwww.csis.org/themes/composer/stable... https://www.csis.org/themes/composer/stable/css/system/components/reset-appearance.module.css?tdlxol — 200 — 524 B — 67 ms — h2https://www.csis.org/themes/composer/stable/css/system/components/resize.module.css?tdlxolwww.csis.org/themes/composer/stable... https://www.csis.org/themes/composer/stable/css/system/components/resize.module.css?tdlxol — 200 — 433 B — 39 ms — h2https://www.csis.org/themes/composer/stable/css/system/components/system-status-counter.css?tdlxolwww.csis.org/themes/composer/stable... https://www.csis.org/themes/composer/stable/css/system/components/system-status-counter.css?tdlxol — 200 — 616 B — 42 ms — h2https://www.csis.org/themes/composer/stable/css/system/components/system-status-report-counters.css?tdlxolwww.csis.org/themes/composer/stable... https://www.csis.org/themes/composer/stable/css/system/components/system-status-report-counters.css?tdlxol — 200 — 509 B — 52 ms — h2https://www.csis.org/themes/composer/stable/css/system/components/system-status-report-general-info.css?tdlxolwww.csis.org/themes/composer/stable... https://www.csis.org/themes/composer/stable/css/system/components/system-status-report-general-info.css?tdlxol — 200 — 421 B — 48 ms — h2https://www.csis.org/themes/composer/stable/css/system/components/tablesort.module.css?tdlxolwww.csis.org/themes/composer/stable... https://www.csis.org/themes/composer/stable/css/system/components/tablesort.module.css?tdlxol — 200 — 545 B — 49 ms — h2https://www.csis.org/modules/custom/c2pa/css/c2pa.css?tdlxolwww.csis.org/modules/custom/c2pa/cs... https://www.csis.org/modules/custom/c2pa/css/c2pa.css?tdlxol — 200 — 399 B — 54 ms — h2https://www.csis.org/modules/composer/ckeditor_indentblock/css/plugins/indentblock/ckeditor.indentblock.css?tdlxolwww.csis.org/modules/composer/ckedi... https://www.csis.org/modules/composer/ckeditor_indentblock/css/plugins/indentblock/ckeditor.indentblock.css?tdlxol — 200 — 579 B — 56 ms — h2https://use.typekit.net/mkb5tpc.cssuse.typekit.net/mkb5tpc.css https://use.typekit.net/mkb5tpc.css — 200 — 985 B — 67 ms — h2https://www.csis.org/themes/custom/ts_csis/dist/ts-csis.css?tdlxolwww.csis.org/themes/custom/ts_csis/... https://www.csis.org/themes/custom/ts_csis/dist/ts-csis.css?tdlxol — 200 — 50.4 KiB — 64 ms — h2https://www.csis.org/themes/custom/ts_csis/node_modules/jquery/dist/jquery.min.js?tdlxolwww.csis.org/themes/custom/ts_csis/... https://www.csis.org/themes/custom/ts_csis/node_modules/jquery/dist/jquery.min.js?tdlxol — 200 — 35.5 KiB — 45 ms — h2https://www.csis.org/core/misc/drupalSettingsLoader.js?v=10.5.9www.csis.org/core/misc/drupalSettin... https://www.csis.org/core/misc/drupalSettingsLoader.js?v=10.5.9 — 200 — 689 B — 63 ms — h2https://www.csis.org/modules/custom/csis_seo/js/csis_seo.js?tdlxolwww.csis.org/modules/custom/csis_se... https://www.csis.org/modules/custom/csis_seo/js/csis_seo.js?tdlxol — 200 — 3.8 KiB — 48 ms — h2https://www.csis.org/modules/custom/csis_seo/js/csis_gtm.js?tdlxolwww.csis.org/modules/custom/csis_se... https://www.csis.org/modules/custom/csis_seo/js/csis_gtm.js?tdlxol — 200 — 584 B — 51 ms — h2https://www.csis.org/modules/custom/c2pa/js/c2pa.js?tdlxolwww.csis.org/modules/custom/c2pa/js... https://www.csis.org/modules/custom/c2pa/js/c2pa.js?tdlxol — 200 — 910 B — 61 ms — h2https://www.csis.org/themes/custom/ts_csis/assets/csis-logo-white.pngwww.csis.org/themes/custom/ts_csis/... https://www.csis.org/themes/custom/ts_csis/assets/csis-logo-white.png — 200 — 21.4 KiB — 27 ms — h2https://www.csis.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.jswww.csis.org/cdn-cgi/scripts/5c5dd7... 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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 38.0 s 40.0 s FCP 5.4 s LCP 38.1 shttps://csis.org// https://csis.org/ — 301 — 512 B — 73 ms — h2https://www.csis.org/www.csis.org/ https://www.csis.org/ — 200 — 37.2 KiB — 45 ms — h2https://www.csis.org/themes/composer/stable/css/system/components/align.module.css?tdlxolwww.csis.org/themes/composer/stable... https://www.csis.org/themes/composer/stable/css/system/components/align.module.css?tdlxol — 200 — 485 B — 37 ms — h2https://www.csis.org/themes/composer/stable/css/system/components/fieldgroup.module.css?tdlxolwww.csis.org/themes/composer/stable... https://www.csis.org/themes/composer/stable/css/system/components/fieldgroup.module.css?tdlxol — 200 — 390 B — 33 ms — h2https://www.csis.org/themes/composer/stable/css/system/components/container-inline.module.css?tdlxolwww.csis.org/themes/composer/stable... 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h2https://www.csis.org/cdn-cgi/rum?www.csis.org/cdn-cgi/rum? https://www.csis.org/cdn-cgi/rum? — 204 — 170 B — 21 ms — h2https://www.googletagmanager.com/gtag/js?id=G-PSYVZP8TWD&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-PSYVZP8TWD&cx=c&gtm=4e64h1 — 200 — 152.1 KiB — 75 ms — h3https://www.csis.org/themes/custom/ts_csis/assets/favicon.icowww.csis.org/themes/custom/ts_csis/... https://www.csis.org/themes/custom/ts_csis/assets/favicon.ico — 200 — 772 B — 26 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-PSYVZP8TWD&gtm=45je64h1v892418592z872160379za20gzb72160379zd72160379&_p=1776806772256&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=927314273.1776806773&frm=0&pscdl=noapi&rcb=9&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938468~117266400~117384406~118463261&sid=1776806773&sct=1&seg=0&dl=https%3A%2F%2Fwww.csis.org%2F&dt=CSIS%20%7C%20Center%20for%20Strategic%20and%20International%20Studies&en=page_view&_fv=1&_ss=1&ep.content_type=page&ep.page_type=Landing%20Page&ep.parent_related=&ep.person_related=&ep.program_related=&ep.region_related=&ep.topic_related=&ep.content_group=page&tfd=1529region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-PSYVZP8TWD&gtm=45je64h1v892418592z872160379za20gzb72160379zd72160379&_p=1776806772256&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=927314273.1776806773&frm=0&pscdl=noapi&rcb=9&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938468~117266400~117384406~118463261&sid=1776806773&sct=1&seg=0&dl=https%3A%2F%2Fwww.csis.org%2F&dt=CSIS%20%7C%20Center%20for%20Strategic%20and%20International%20Studies&en=page_view&_fv=1&_ss=1&ep.content_type=page&ep.page_type=Landing%20Page&ep.parent_related=&ep.person_related=&ep.program_related=&ep.region_related=&ep.topic_related=&ep.content_group=page&tfd=1529 — 204 — 290 B — 72 ms — h2
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 2764ms · 601KB · €30/mo
Unattributable
Other
Costly
Execution 642ms
Transfer 0 KB
Monthly Cost €7/mo
www.csis.org
Other
Costly
Execution 572ms
Transfer 37 KB
Monthly Cost €6/mo
Google Tag Manager
Tag Manager
Costly
Execution 337ms
Transfer 163 KB
Unused 40%
Monthly Cost €4/mo
www.csis.org
Other
Costly
Execution 307ms
Transfer 2 KB
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 282ms
Transfer 175 KB
Unused 40%
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 222ms
Transfer 152 KB
Unused 42%
Monthly Cost €2/mo
www.csis.org
Other
Costly
Execution 209ms
Transfer 31 KB
Monthly Cost €2/mo
LinkedIn Insight
Advertising
Optional
Execution 68ms
Transfer 19 KB
Monthly Cost €1/mo
www.csis.org
Other
Optional
Execution 67ms
Transfer 1 KB
Monthly Cost €1/mo
Google Analytics
Analytics
Optional
Execution 58ms
Transfer 21 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 642ms and costs ~€7/month
  • www.csis.org adds 572ms and costs ~€6/month
  • Google Tag Manager adds 337ms and costs ~€4/month
  • www.csis.org adds 307ms and costs ~€3/month
  • Google Tag Manager adds 282ms and costs ~€3/month
  • Google Tag Manager adds 222ms and costs ~€2/month
  • www.csis.org adds 209ms and costs ~€2/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 642ms 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.csis.org takes 572ms 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 337ms 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.csis.org takes 307ms 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 282ms 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 222ms 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.csis.org takes 209ms 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

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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