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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
4
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
82
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
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.

942 ms

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

3.04 s

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

42 ms

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

0.009

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

1.13 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.

4.09 s

Page Load Progression

480 ms
961 ms
1.4 s
1.9 s
2.4 s
2.9 s
3.4 s
3.8 s
Checks
15
7 PASS 2 REVIEW 4 FIX
F
Page Weight Budget
Action
7.7 MB transferred, 116 requests
FIX
7.7 MB transferred, 116 requests
Critical::
Page weighs 11.0 MB (7.7 MB transferred)
Warning::
Images are 1.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.6 MB
Warning::
JavaScript is 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 205 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 205 KB
Warning::
116 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.6 g CO2 per page load
7.7 MB / 2.4 MB budget
7.7 MB transferred
116 requests
1.6 g CO2 per page load
Other 4.6 MiB 59%
Images 1.6 MiB 20%
JavaScript 865.0 KiB 11%
Other 457.7 KiB 6%
Fonts 204.8 KiB 3%
CSS 63.5 KiB 1%
HTML 37.2 KiB 0%
Other 3.2 KiB 0%
Other 2.1 KiB 0%
Other 547 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

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 (7.7 MiB of 7.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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/gtag/js?id=G-PSYV...: 65 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MNG...: 64 KB unused (40%)
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/gtag/js?id=G-PSYVZP8TWD&cx=c&gtm=4e64h1152 KB65 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MNGQTH163 KB64 KB (40%)✓3rd
https://cdn.jsdelivr.net/npm/c2pa@0.14.4/+esm79 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?tdlxol35 KB22 KB (63%)✓3rd
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451611 KB—✓3rd
https://www.csis.org/themes/custom/ts_csis/dist/audio-gtm-tracker.bcef1c78.js1 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
116 resources · 7.7 MB · 311 KB savings available
FIX
116 resources · 7.7 MB · 311 KB savings available
Warning::
Page weight 6.7 MB over 1MB target
Got: 7.7 MB Expected: ≤ 1 MB
Info::
~311 KB of savings available
Warning::
115 third-party resources (100% of weight)
Info::
3 resources over 200KB
116 resources · 7.7 MiB · 115 third-party 6.7 MiB over 1MB target
Media 59% · 4.6 MiB
Image 20% · 1.6 MiB
JavaScript 11% · 870.2 KiB
Other 6% · 456.6 KiB
Font 3% · 204.8 KiB
CSS 1% · 63.5 KiB
Document 0% · 38.2 KiB

~311.2 KiB of savings available

Remove unused JavaScript: 311.2 KiB
B
Image Optimization
27 images, 0 KB saveable
REVIEW
27 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.
27 images 1.6 MB
0 oversized -0 KB
27 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

B
JS Execution Cost
913ms total JS execution
REVIEW
913ms total JS execution
Warning::
https://www.csis.org/: 281ms CPU time
Info::
Unattributable: 228ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-MNG...: 117ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-0S87...: 103ms CPU time
Info::
https://www.csis.org/themes/custom/ts_csis/dist/au...: 76ms CPU time
Warning::
Third-party scripts: 913ms (100% of total)

Main Thread Breakdown

Script Evaluation 44% Other 25% Style & Layout 18% Script Parsing & Compilation 6% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.csis.org/281ms3ms0ms3rd
Unattributable228ms49ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MNGQTH117ms105ms10ms3rd
https://www.googletagmanager.com/gtag/js?id=G-0S87RLF4Y6&cx=c&gtm=4e64h1103ms84ms18ms3rd
https://www.csis.org/themes/custom/ts_csis/dist/audio-player.52f6941d.js76ms75ms1ms3rd
https://www.googletagmanager.com/gtag/js?id=G-PSYVZP8TWD&cx=c&gtm=4e64h157ms46ms11ms3rd
https://www.csis.org/themes/custom/ts_csis/dist/department-hero.90a658d6.js51ms16ms4ms3rd
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
6 fonts (205 KB)
PASS
6 fonts (205 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

205 KB total

Render-blocking

0

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 942 ms LCP 3.0 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 — 30 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 — 31 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 — 32 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 — 33 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 — 51.7 KiB — 38 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 — 40 ms — font-display: swap
l woff2 swap
Size 17 KB
Load time 30 ms
Start 336 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 17 KB
Load time 31 ms
Start 336 ms
Risk FOUT — text flashes from fallback to web font
PublicoHeadline-Bold-We... woff2 swap
Size 45 KB
Load time 32 ms
Start 336 ms
Risk FOUT — text flashes from fallback to web font
PublicoHeadline-Extrabo... woff2 swap
Size 36 KB
Load time 33 ms
Start 337 ms
Risk FOUT — text flashes from fallback to web font
PublicoText-Roman-Web.1... woff2 swap
Size 52 KB
Load time 38 ms
Start 337 ms
Risk FOUT — text flashes from fallback to web font
PublicoHeadline-Medium-... woff2 swap
Size 38 KB
Load time 40 ms
Start 337 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+
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
116 requests over 1526ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 942 ms LCP 3.0 shttps://csis.org// https://csis.org/ — 301 — 511 B — 71 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 — 546 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 — 423 B — 39 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 — 381 B — 38 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 — 492 B — 41 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 — 413 B — 38 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 — 950 B — 44 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 — 401 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 — 562 B — 41 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 — 41 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 — 423 B — 46 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 — 494 B — 42 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 — 441 B — 44 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 — 593 B — 45 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 — 539 B — 64 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 — 442 B — 47 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 — 518 B — 48 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 — 389 B — 50 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 — 554 B — 59 ms — h2https://use.typekit.net/mkb5tpc.cssuse.typekit.net/mkb5tpc.css https://use.typekit.net/mkb5tpc.css — 200 — 986 B — 14 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 — 51 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 — 696 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 — 61 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 — 605 B — 61 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 — 909 B — 61 ms — h2https://p.typekit.net/p.css?s=1&k=mkb5tpc&ht=tk&f=38207.38208.38209.38210&a=125314423&app=typekit&e=cssp.typekit.net/p.css?s=1&k=mkb5tpc&h... https://p.typekit.net/p.css?s=1&k=mkb5tpc&ht=tk&f=38207.38208.38209.38210&a=125314423&app=typekit&e=css — 200 — 172 B — 10 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 — 28 ms — h2https://www.csis.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.jswww.csis.org/cdn-cgi/scripts/5c5dd7... https://www.csis.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js — 200 — 767 B — 23 ms — h2
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https://dcs-spotify.megaphone.fm/CSIS1911647935.mp3?key=640fa0a2eae04cbc8d3c7b0b4c4dba74&request_event_id=0797e03f-b206-4fc9-beb2-74b12861a090&session_id=0797e03f-b206-4fc9-beb2-74b12861a090&timetoken=1776813991_18B89DDBE35FE51FF1D89D2C64EBE898 — 206 — 4.6 MiB — 16 ms — h2https://px4.ads.linkedin.com/collect?v=2&fmt=js&pid=6125426%2C6095810&time=1776806791820&url=https%3A%2F%2Fwww.csis.org%2F&tm=gtmv2&e_ipv6=AQJeniNIzRIgRAAAAZ2x8AsmspC0Tv8DmhQXa3hIRRssDywnflSdwLz4aNwa0SrCxfCi5ayLfhtGpx4.ads.linkedin.com/collect?v=2&fm... https://px4.ads.linkedin.com/collect?v=2&fmt=js&pid=6125426%2C6095810&time=1776806791820&url=https%3A%2F%2Fwww.csis.org%2F&tm=gtmv2&e_ipv6=AQJeniNIzRIgRAAAAZ2x8AsmspC0Tv8DmhQXa3hIRRssDywnflSdwLz4aNwa0SrCxfCi5ayLfhtG — 200 — 568 B — 185 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 — 79 ms — h3https://www.csis.org/cdn-cgi/rum?www.csis.org/cdn-cgi/rum? https://www.csis.org/cdn-cgi/rum? — 204 — 170 B — 22 ms — h2https://region1.analytics.google.com/g/collect?v=2&tid=G-0S87RLF4Y6&gtm=45je64h1v892418532z872160379za20gzb72160379zd72160379&_p=1776806791116&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=AAAAAGQ&are=1&cid=1416261207.1776806792&frm=0&pscdl=noapi&rcb=1&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=2&tag_exp=0~115616986~115938466~115938469~117266401~117884344&dp=%2F&sid=1776806791&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_meta&ep.page_url=https%3A%2F%2Fwww.csis.org%2F&ep.content_type=page&ep.month_published=&ep.date_published=&ep.parent_related=&epn.event_id=548954615&ep.year_published=&ep.page_type=Landing%20Page&_et=10&tfd=1368region1.analytics.google.com/g/coll... https://region1.analytics.google.com/g/collect?v=2&tid=G-0S87RLF4Y6&gtm=45je64h1v892418532z872160379za20gzb72160379zd72160379&_p=1776806791116&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=AAAAAGQ&are=1&cid=1416261207.1776806792&frm=0&pscdl=noapi&rcb=1&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=2&tag_exp=0~115616986~115938466~115938469~117266401~117884344&dp=%2F&sid=1776806791&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_meta&ep.page_url=https%3A%2F%2Fwww.csis.org%2F&ep.content_type=page&ep.month_published=&ep.date_published=&ep.parent_related=&epn.event_id=548954615&ep.year_published=&ep.page_type=Landing%20Page&_et=10&tfd=1368 — 204 — 48 B — 25 ms — h2https://region1.analytics.google.com/g/collect?v=2&tid=G-0S87RLF4Y6&gtm=45je64h1v892418532z872160379za20gzb72160379zd72160379&_p=1776806791116&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=AAAAAGQ&are=1&cid=1416261207.1776806792&frm=0&pscdl=noapi&rcb=1&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=3&tag_exp=0~115616986~115938466~115938469~117266401~117884344&sid=1776806791&sct=1&seg=0&dl=https%3A%2F%2Fwww.csis.org%2F&dt=CSIS%20%7C%20Center%20for%20Strategic%20and%20International%20Studies&en=scroll_depth&_c=1&epn.percent_scrolled=10&_et=314&tfd=1369region1.analytics.google.com/g/coll... https://region1.analytics.google.com/g/collect?v=2&tid=G-0S87RLF4Y6&gtm=45je64h1v892418532z872160379za20gzb72160379zd72160379&_p=1776806791116&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=AAAAAGQ&are=1&cid=1416261207.1776806792&frm=0&pscdl=noapi&rcb=1&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=3&tag_exp=0~115616986~115938466~115938469~117266401~117884344&sid=1776806791&sct=1&seg=0&dl=https%3A%2F%2Fwww.csis.org%2F&dt=CSIS%20%7C%20Center%20for%20Strategic%20and%20International%20Studies&en=scroll_depth&_c=1&epn.percent_scrolled=10&_et=314&tfd=1369 — 204 — 48 B — 25 ms — h2https://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 — 746 B — 29 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-PSYVZP8TWD&gtm=45je64h1v892418592z872160379za20gzb72160379zd72160379&_p=1776806791116&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1416261207.1776806792&frm=0&pscdl=noapi&rcb=4&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938469~117266400&sid=1776806792&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=1500region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-PSYVZP8TWD&gtm=45je64h1v892418592z872160379za20gzb72160379zd72160379&_p=1776806791116&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1416261207.1776806792&frm=0&pscdl=noapi&rcb=4&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938469~117266400&sid=1776806792&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=1500 — 204 — 290 B — 26 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 913ms · 570KB · €10/mo
www.csis.org
Other
Costly
Execution 281ms
Transfer 37 KB
Monthly Cost €3/mo
Unattributable
Other
Costly
Execution 228ms
Transfer 0 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 117ms
Transfer 163 KB
Unused 40%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 103ms
Transfer 175 KB
Unused 40%
Monthly Cost €1/mo
www.csis.org
Other
Optional
Execution 76ms
Transfer 12 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 57ms
Transfer 152 KB
Unused 43%
Monthly Cost €1/mo
www.csis.org
Other
Optional
Execution 51ms
Transfer 31 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.csis.org adds 281ms and costs ~€3/month
  • Unattributable adds 228ms 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

www.csis.org takes 281ms 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 228ms 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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