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https://nypl.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
92
GRADE
A
FIX
6
REVIEW
2
PASS
5
INFO
2

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

68
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.
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.

1.25 s

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

688 ms

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

0.000

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

1.42 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.

5.00 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
5 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
4.8 MB transferred, 92 requests
FIX
4.8 MB transferred, 92 requests
Critical::
Page weighs 13.0 MB (4.8 MB transferred)
Warning::
JavaScript is 2.9 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.9 MB
Warning::
Images are 1.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.7 MB
Info::
92 HTTP requests
Info::
Estimated 1.0 g CO2 per page load
4.8 MB / 2.4 MB budget
4.8 MB transferred
92 requests
1.0 g CO2 per page load
JavaScript 2.9 MiB 61%
Images 1.7 MiB 35%
HTML 67.8 KiB 1%
Other 58.3 KiB 1%
CSS 18.9 KiB 0%
Other 15.3 KiB 0%
Other 1.8 KiB 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

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

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (4.8 MiB of 4.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2704ms total JS execution
FIX
2704ms total JS execution
Warning::
https://a.optmnstr.com/app/js/25.7ea6f63f.min.js: 468ms CPU time
Warning::
https://www.nypl.org/scout/_next/static/chunks/fra...: 436ms CPU time
Warning::
https://www.nypl.org/: 413ms CPU time
Info::
https://ds-header.nypl.org/header.min.js?container...: 210ms CPU time
Info::
Unattributable: 198ms CPU time
Warning::
Third-party scripts: 2704ms (100% of total)

Main Thread Breakdown

Script Evaluation 66% Other 12% Script Parsing & Compilation 10% Style & Layout 7%
ScriptTotalScriptingParse/CompileParty
https://a.optmnstr.com/app/js/25.7ea6f63f.min.js468ms446ms0ms3rd
https://www.nypl.org/scout/_next/static/chunks/framework-3bc9684f49160ebb.js436ms394ms10ms3rd
https://www.nypl.org/413ms11ms0ms3rd
https://ds-header.nypl.org/header.min.js?containerId=nypl-header210ms152ms57ms3rd
Unattributable198ms4ms0ms3rd
https://ds-header.nypl.org/footer.min.js?containerId=nypl-footer178ms110ms57ms3rd
https://www.nypl.org/scout/_next/static/chunks/pages/index-3442857d06f9fe36.js171ms170ms0ms3rd
https://www.nypl.org/scout/_next/static/chunks/pages/_app-87b548fdd4e15b52.js156ms97ms55ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-RKWC143ms121ms16ms3rd
https://www.googletagmanager.com/gtag/js?id=G-P03CNT7C31&cx=c&gtm=4e64h1137ms114ms21ms3rd

Showing top 10 of 13 scripts

F
JS Bundles
Action
40 scripts, 1.9 MB unused
FIX
40 scripts, 1.9 MB unused
Warning::
https://ds-header.nypl.org/footer.min.js?container...: 449 KB unused (81%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.nypl.org/scout/_next/static/chunks/pag...: 447 KB unused (84%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ds-header.nypl.org/header.min.js?container...: 445 KB unused (80%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.nypl.org/scout/_next/static/chunks/854...: 398 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.nypl.org/scout/_next/static/chunks/fec...: 98 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.9 MB
1989 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://ds-header.nypl.org/footer.min.js?containerId=nypl-footer552 KB449 KB (81%)3rd
https://www.nypl.org/scout/_next/static/chunks/pages/_app-87b548fdd4e15b52.js531 KB447 KB (84%)3rd
https://ds-header.nypl.org/header.min.js?containerId=nypl-header556 KB445 KB (80%)3rd
https://www.nypl.org/scout/_next/static/chunks/8548-197d8009f521d522.js612 KB398 KB (69%)3rd
https://www.nypl.org/scout/_next/static/chunks/fec483df-fabc1ee4c428b220.js99 KB98 KB (100%)3rd
https://www.googletagmanager.com/gtm.js?id=GTM-RKWC172 KB64 KB (37%)3rd
https://www.googletagmanager.com/gtag/js?id=G-P03CNT7C31&cx=c&gtm=4e64h1172 KB54 KB (31%)3rd
https://www.nypl.org/scout/_next/static/chunks/framework-3bc9684f49160ebb.js65 KB34 KB (53%)3rd
https://assets.nypl.org/js/advocacy.js1 KB3rd
https://a.optmnstr.com/app/js/5.e5885c40.min.js5 KB3rd

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
92 resources · 4.8 MB · 1.9 MB savings available
FIX
92 resources · 4.8 MB · 1.9 MB savings available
Warning::
Page weight 3.8 MB over 1MB target
Got: 4.8 MB Expected: ≤ 1 MB
Info::
~1.9 MB of savings available
Warning::
91 third-party resources (100% of weight)
Info::
4 resources over 200KB
92 resources · 4.8 MiB · 91 third-party 3.8 MiB over 1MB target
JavaScript 61% · 2.9 MiB
Image 36% · 1.7 MiB
Document 1% · 67.8 KiB
Other 1% · 60.1 KiB
CSS 0% · 18.9 KiB

~1.9 MiB of savings available

Remove unused JavaScript: 1.9 MiB
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
Image Optimization
38 images, 0 KB saveable
REVIEW
38 images, 0 KB saveable
Warning::
https://cdn-d8.nypl.org/s3fs-public/2020-05/NYPL_M... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
38 images 1.7 MB
0 oversized -0 KB
5 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

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+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
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
92 requests over 6412ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 1.1 s LCP 1.3 shttps://nypl.org// https://nypl.org/ — 301 — 53 B — 42 ms — h2https://www.nypl.org/www.nypl.org/ https://www.nypl.org/ — 200 — 444 B — 26 ms — h2https://www.nypl.org/_Incapsula_Resource?SWJIYLWA=5074a744e2e3d891814e9a2dace20bd4,719d34d31c8e3a6e6fffd425f7e032f3www.nypl.org/_Incapsula_Resource?SW... https://www.nypl.org/_Incapsula_Resource?SWJIYLWA=5074a744e2e3d891814e9a2dace20bd4,719d34d31c8e3a6e6fffd425f7e032f3 — 200 — 25.8 KiB — 28 ms — h2https://www.nypl.org/_Incapsula_Resource?SWHANEDL=6565489651573482811,11432664611168296622,18407362602574252930,228428www.nypl.org/_Incapsula_Resource?SW... https://www.nypl.org/_Incapsula_Resource?SWHANEDL=6565489651573482811,11432664611168296622,18407362602574252930,228428 — 200 — 57 B — 16 ms — h2https://www.nypl.org/www.nypl.org/ https://www.nypl.org/ — 200 — 67.4 KiB — 487 ms — h2https://www.nypl.org/_Incapsula_Resource?SWKMTFSR=1&e=0.195991038971415www.nypl.org/_Incapsula_Resource?SW... https://www.nypl.org/_Incapsula_Resource?SWKMTFSR=1&e=0.195991038971415 — 200 — 36 B — 6 ms — h2https://www.nypl.org/_Incapsula_Resource?ES2LURCT=67&t=78&d=complete%20(s%3A2%2Cc%3A19%2Cr%3A409)www.nypl.org/_Incapsula_Resource?ES... https://www.nypl.org/_Incapsula_Resource?ES2LURCT=67&t=78&d=complete%20(s%3A2%2Cc%3A19%2Cr%3A409) — -1 — 0 B — 0 ms — https://www.nypl.org/scout/_next/static/css/324bf731318319c7.csswww.nypl.org/scout/_next/static/css... https://www.nypl.org/scout/_next/static/css/324bf731318319c7.css — 200 — 15.9 KiB — 172 ms — h2https://www.nypl.org/scout/_next/static/chunks/webpack-ad39fe35ba91a40c.jswww.nypl.org/scout/_next/static/chu... https://www.nypl.org/scout/_next/static/chunks/webpack-ad39fe35ba91a40c.js — 200 — 1.6 KiB — 107 ms — h2https://www.nypl.org/scout/_next/static/chunks/framework-3bc9684f49160ebb.jswww.nypl.org/scout/_next/static/chu... https://www.nypl.org/scout/_next/static/chunks/framework-3bc9684f49160ebb.js — 200 — 65.3 KiB — 252 ms — h2https://www.nypl.org/scout/_next/static/chunks/main-e0143e4eaaf0ea82.jswww.nypl.org/scout/_next/static/chu... https://www.nypl.org/scout/_next/static/chunks/main-e0143e4eaaf0ea82.js — 200 — 38.4 KiB — 186 ms — h2https://www.nypl.org/scout/_next/static/chunks/pages/_app-87b548fdd4e15b52.jswww.nypl.org/scout/_next/static/chu... https://www.nypl.org/scout/_next/static/chunks/pages/_app-87b548fdd4e15b52.js — 200 — 530.6 KiB — 4.1 s — h2https://www.nypl.org/scout/_next/static/chunks/1f383bf6-5eaad99ab9d2732c.jswww.nypl.org/scout/_next/static/chu... https://www.nypl.org/scout/_next/static/chunks/1f383bf6-5eaad99ab9d2732c.js — 200 — 13.2 KiB — 194 ms — h2https://www.nypl.org/scout/_next/static/chunks/c5968a44-09339db0b7f76f16.jswww.nypl.org/scout/_next/static/chu... https://www.nypl.org/scout/_next/static/chunks/c5968a44-09339db0b7f76f16.js — 200 — 13.2 KiB — 194 ms — h2https://www.nypl.org/scout/_next/static/chunks/fec483df-fabc1ee4c428b220.jswww.nypl.org/scout/_next/static/chu... https://www.nypl.org/scout/_next/static/chunks/fec483df-fabc1ee4c428b220.js — 200 — 98.7 KiB — 507 ms — h2https://www.nypl.org/scout/_next/static/chunks/8548-197d8009f521d522.jswww.nypl.org/scout/_next/static/chu... https://www.nypl.org/scout/_next/static/chunks/8548-197d8009f521d522.js — 200 — 611.6 KiB — 1.4 s — h2https://www.nypl.org/scout/_next/static/chunks/5675-7fae0d4b6ca70f05.jswww.nypl.org/scout/_next/static/chu... https://www.nypl.org/scout/_next/static/chunks/5675-7fae0d4b6ca70f05.js — 200 — 4.3 KiB — 295 ms — h2https://www.nypl.org/scout/_next/static/chunks/3445-8e6fa341edd97395.jswww.nypl.org/scout/_next/static/chu... https://www.nypl.org/scout/_next/static/chunks/3445-8e6fa341edd97395.js — 200 — 28.0 KiB — 361 ms — h2https://www.nypl.org/scout/_next/static/chunks/6795-75b21ac99b31fcb0.jswww.nypl.org/scout/_next/static/chu... https://www.nypl.org/scout/_next/static/chunks/6795-75b21ac99b31fcb0.js — 200 — 12.2 KiB — 343 ms — h2https://www.nypl.org/scout/_next/static/chunks/pages/index-3442857d06f9fe36.jswww.nypl.org/scout/_next/static/chu... https://www.nypl.org/scout/_next/static/chunks/pages/index-3442857d06f9fe36.js — 200 — 794 B — 399 ms — h2https://www.nypl.org/scout/_next/static/scout/_buildManifest.jswww.nypl.org/scout/_next/static/sco... https://www.nypl.org/scout/_next/static/scout/_buildManifest.js — 200 — 1.8 KiB — 435 ms — h2https://www.nypl.org/scout/_next/static/scout/_ssgManifest.jswww.nypl.org/scout/_next/static/sco... https://www.nypl.org/scout/_next/static/scout/_ssgManifest.js — 200 — 923 B — 456 ms — h2https://www.nypl.org/_Incapsula_Resource?SWJIYLWA=719d34d31c8e3a6e6fffd425f7e032f3&ns=3&cb=2123714118www.nypl.org/_Incapsula_Resource?SW... https://www.nypl.org/_Incapsula_Resource?SWJIYLWA=719d34d31c8e3a6e6fffd425f7e032f3&ns=3&cb=2123714118 — 200 — 20.2 KiB — 17 ms — h2https://www.nypl.org/_Incapsula_Resource?SWKMTFSR=1&e=0.35883264984803775www.nypl.org/_Incapsula_Resource?SW... https://www.nypl.org/_Incapsula_Resource?SWKMTFSR=1&e=0.35883264984803775 — 200 — 82 B — 7 ms — h2https://drupal.nypl.org/sites-drupal/default/files/styles/hero_header_focal_point_2400x400/public/2025-04/WLAF_Graphics_250316.png?h=ef32067e&itok=OPrjHcl1drupal.nypl.org/sites-drupal/defaul... https://drupal.nypl.org/sites-drupal/default/files/styles/hero_header_focal_point_2400x400/public/2025-04/WLAF_Graphics_250316.png?h=ef32067e&itok=OPrjHcl1 — 200 — 21.9 KiB — 30 ms — h2https://www.nypl.org/scout/_next/image?url=https%3A%2F%2Fdrupal.nypl.org%2Fsites-drupal%2Fdefault%2Ffiles%2Fstyles%2F2_1_960%2Fpublic%2F2024-03%2FAAH_Month_1000x500%2520%25281%2529.png%3Fh%3D5dabf909%26itok%3DA1keyngv&w=1920&q=90www.nypl.org/scout/_next/image?url=... https://www.nypl.org/scout/_next/image?url=https%3A%2F%2Fdrupal.nypl.org%2Fsites-drupal%2Fdefault%2Ffiles%2Fstyles%2F2_1_960%2Fpublic%2F2024-03%2FAAH_Month_1000x500%2520%25281%2529.png%3Fh%3D5dabf909%26itok%3DA1keyngv&w=1920&q=90 — 200 — 15.3 KiB — 298 ms — h2https://www.nypl.org/scout/_next/image?url=https%3A%2F%2Fdrupal.nypl.org%2Fsites-drupal%2Fdefault%2Ffiles%2Fstyles%2F2_1_960%2Fpublic%2F2024-03%2FPoetry%2520Month%2520Web%2520Graphics_2024_Identity%25201000x500.png%3Fh%3D5dabf909%26itok%3DL82UwlEJ&w=1920&q=90www.nypl.org/scout/_next/image?url=... https://www.nypl.org/scout/_next/image?url=https%3A%2F%2Fdrupal.nypl.org%2Fsites-drupal%2Fdefault%2Ffiles%2Fstyles%2F2_1_960%2Fpublic%2F2024-03%2FPoetry%2520Month%2520Web%2520Graphics_2024_Identity%25201000x500.png%3Fh%3D5dabf909%26itok%3DL82UwlEJ&w=1920&q=90 — 200 — 22.4 KiB — 379 ms — h2https://www.nypl.org/scout/_next/image?url=https%3A%2F%2Fdrupal.nypl.org%2Fsites-drupal%2Fdefault%2Ffiles%2Fstyles%2F2_1_960%2Fpublic%2F2026-03%2FGetLit_Homepage_Social_1200x600_Apr.png%3Fh%3Dbde28bee%26itok%3DLawmJ9hi&w=1920&q=90www.nypl.org/scout/_next/image?url=... https://www.nypl.org/scout/_next/image?url=https%3A%2F%2Fdrupal.nypl.org%2Fsites-drupal%2Fdefault%2Ffiles%2Fstyles%2F2_1_960%2Fpublic%2F2026-03%2FGetLit_Homepage_Social_1200x600_Apr.png%3Fh%3Dbde28bee%26itok%3DLawmJ9hi&w=1920&q=90 — 200 — 40.4 KiB — 451 ms — h2https://www.nypl.org/scout/_next/image?url=https%3A%2F%2Fdrupal.nypl.org%2Fsites-drupal%2Fdefault%2Ffiles%2Fstyles%2F2_1_960%2Fpublic%2F2025-01%2FSC%2520Feb%2520Launch_header%25201000x500%2520%25282%2529.png%3Fh%3D1ff4b6c7%26itok%3DTQOCOP_H&w=1920&q=90www.nypl.org/scout/_next/image?url=... https://www.nypl.org/scout/_next/image?url=https%3A%2F%2Fdrupal.nypl.org%2Fsites-drupal%2Fdefault%2Ffiles%2Fstyles%2F2_1_960%2Fpublic%2F2025-01%2FSC%2520Feb%2520Launch_header%25201000x500%2520%25282%2529.png%3Fh%3D1ff4b6c7%26itok%3DTQOCOP_H&w=1920&q=90 — 200 — 31.2 KiB — 503 ms — h2https://www.nypl.org/scout/_next/image?url=https%3A%2F%2Fdrupal.nypl.org%2Fsites-drupal%2Fdefault%2Ffiles%2Fstyles%2F2_1_960%2Fpublic%2F2026-04%2FThe%2520Anatomy%2520of%2520a%2520Disappearance%2520%25281%2529.png%3Fh%3D2c61325d%26itok%3DsEejUESe&w=1920&q=90www.nypl.org/scout/_next/image?url=... https://www.nypl.org/scout/_next/image?url=https%3A%2F%2Fdrupal.nypl.org%2Fsites-drupal%2Fdefault%2Ffiles%2Fstyles%2F2_1_960%2Fpublic%2F2026-04%2FThe%2520Anatomy%2520of%2520a%2520Disappearance%2520%25281%2529.png%3Fh%3D2c61325d%26itok%3DsEejUESe&w=1920&q=90 — 200 — 91.9 KiB — 1.5 s — h2
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46 ms — h3https://a.optmnstr.com/app/js/4.5e4ec97b.min.jsa.optmnstr.com/app/js/4.5e4ec97b.mi... https://a.optmnstr.com/app/js/4.5e4ec97b.min.js — 200 — 14.7 KiB — 11 ms — h2https://a.optmnstr.com/app/js/12.429229cc.min.jsa.optmnstr.com/app/js/12.429229cc.m... https://a.optmnstr.com/app/js/12.429229cc.min.js — 200 — 1.5 KiB — 9 ms — h2https://a.optmnstr.com/app/js/24.4a2cb029.min.jsa.optmnstr.com/app/js/24.4a2cb029.m... https://a.optmnstr.com/app/js/24.4a2cb029.min.js — 200 — 1.7 KiB — 5 ms — h2https://www.google.com/pagead/1p-user-list/1071887486/?random=1776810803919&cv=11&fst=1776808800000&bg=ffffff&guid=ON&async=1&en=gtag.config&gtm=45je64h1v9115477143z86109239za20gzb6109239zd6109239xec&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115616985~115938466~115938468~117227715~117266400~117512543&u_w=800&u_h=600&url=https%3A%2F%2Fwww.nypl.org%2F&ref=https%3A%2F%2Fwww.nypl.org%2F&rcb=7&frm=0&tiba=The%20New%20York%20Public%20Library&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=1665460431.1776810804&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=0&uam=&uap=macOS&uapv=10.15.7&uaw=0&data=event%3Dgtag.config&rfmt=3&fmt=3&is_vtc=1&cid=CAQSsAEABaugfUWZKbJUuVvPhu8GYUwhZ1fqYbw83FPKtBWf0TvIcmtyYKz57PwgSsO4g1UPiC376mrJUMI-sFdMz8gLhIXIz0Sr-bwN-vZNStw9xnas_XCwfkNuJM-hVzU2N2e8viGORvJrtTPyqJuhBqE2KhIvxLCfw7eMB_F2Wi6TML17PXvEwNtLT-XouaPolGuJW0biOSBXq54HLurjA1flr3MHxNVb4S_ntgxO_Xe8wQ&random=4210220330&rmt_tld=0&ipr=ywww.google.com/pagead/1p-user-list/... https://www.google.com/pagead/1p-user-list/1071887486/?random=1776810803919&cv=11&fst=1776808800000&bg=ffffff&guid=ON&async=1&en=gtag.config&gtm=45je64h1v9115477143z86109239za20gzb6109239zd6109239xec&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115616985~115938466~115938468~117227715~117266400~117512543&u_w=800&u_h=600&url=https%3A%2F%2Fwww.nypl.org%2F&ref=https%3A%2F%2Fwww.nypl.org%2F&rcb=7&frm=0&tiba=The%20New%20York%20Public%20Library&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=1665460431.1776810804&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=0&uam=&uap=macOS&uapv=10.15.7&uaw=0&data=event%3Dgtag.config&rfmt=3&fmt=3&is_vtc=1&cid=CAQSsAEABaugfUWZKbJUuVvPhu8GYUwhZ1fqYbw83FPKtBWf0TvIcmtyYKz57PwgSsO4g1UPiC376mrJUMI-sFdMz8gLhIXIz0Sr-bwN-vZNStw9xnas_XCwfkNuJM-hVzU2N2e8viGORvJrtTPyqJuhBqE2KhIvxLCfw7eMB_F2Wi6TML17PXvEwNtLT-XouaPolGuJW0biOSBXq54HLurjA1flr3MHxNVb4S_ntgxO_Xe8wQ&random=4210220330&rmt_tld=0&ipr=y — 200 — 64 B — 69 ms — h3https://a.optmnstr.com/app/js/18.fd565c76.min.jsa.optmnstr.com/app/js/18.fd565c76.m... https://a.optmnstr.com/app/js/18.fd565c76.min.js — 200 — 2.6 KiB — 44 ms — h2https://a.optmnstr.com/app/js/26.cce526bd.min.jsa.optmnstr.com/app/js/26.cce526bd.m... https://a.optmnstr.com/app/js/26.cce526bd.min.js — 200 — 2.6 KiB — 60 ms — h2https://a.optmnstr.com/app/js/32.0d845025.min.jsa.optmnstr.com/app/js/32.0d845025.m... https://a.optmnstr.com/app/js/32.0d845025.min.js — 200 — 10.3 KiB — 23 ms — h2https://a.optmnstr.com/app/js/9.a3de2dc4.min.jsa.optmnstr.com/app/js/9.a3de2dc4.mi... https://a.optmnstr.com/app/js/9.a3de2dc4.min.js — 200 — 10.7 KiB — 38 ms — h2https://a.optmnstr.com/app/js/0.1f0bc4b7.min.jsa.optmnstr.com/app/js/0.1f0bc4b7.mi... https://a.optmnstr.com/app/js/0.1f0bc4b7.min.js — 200 — 3.0 KiB — 23 ms — h2https://a.optmnstr.com/app/js/8.072a9e09.min.jsa.optmnstr.com/app/js/8.072a9e09.mi... https://a.optmnstr.com/app/js/8.072a9e09.min.js — 200 — 1.5 KiB — 40 ms — h2https://a.optmnstr.com/app/js/10.99a11d53.min.jsa.optmnstr.com/app/js/10.99a11d53.m... https://a.optmnstr.com/app/js/10.99a11d53.min.js — 200 — 1.6 KiB — 57 ms — h2https://a.optmnstr.com/app/js/27.24395f55.min.jsa.optmnstr.com/app/js/27.24395f55.m... https://a.optmnstr.com/app/js/27.24395f55.min.js — 200 — 2.2 KiB — 28 ms — h2https://a.optmnstr.com/app/js/25.7ea6f63f.min.jsa.optmnstr.com/app/js/25.7ea6f63f.m... https://a.optmnstr.com/app/js/25.7ea6f63f.min.js — 200 — 1.2 KiB — 57 ms — h2https://a.optmnstr.com/app/js/15.c4821833.min.jsa.optmnstr.com/app/js/15.c4821833.m... https://a.optmnstr.com/app/js/15.c4821833.min.js — 200 — 1.2 KiB — 29 ms — h2https://a.optmnstr.com/app/js/1.1dbc4ebc.min.jsa.optmnstr.com/app/js/1.1dbc4ebc.mi... https://a.optmnstr.com/app/js/1.1dbc4ebc.min.js — 200 — 3.1 KiB — 43 ms — h2https://a.optmnstr.com/app/js/20.30b8c296.min.jsa.optmnstr.com/app/js/20.30b8c296.m... https://a.optmnstr.com/app/js/20.30b8c296.min.js — 200 — 1.5 KiB — 42 ms — h2https://cdn-d8.nypl.org/s3fs-public/2020-05/NYPL_MainFacadeRev2Cam2.pngcdn-d8.nypl.org/s3fs-public/2020-05... https://cdn-d8.nypl.org/s3fs-public/2020-05/NYPL_MainFacadeRev2Cam2.png — 200 — 150.0 KiB — 85 ms — h2https://drupal.nypl.org/api/alerts/alldrupal.nypl.org/api/alerts/all https://drupal.nypl.org/api/alerts/all — 200 — 1.2 KiB — 18 ms — h2https://www.nypl.org/favicon.icowww.nypl.org/favicon.ico https://www.nypl.org/favicon.ico — 200 — 15.3 KiB — 240 ms — h2https://www.google-analytics.com/g/collect?v=2&tid=G-P03CNT7C31&gtm=45je64h1v9115477143z86109239za20gzb6109239zd6109239&_p=1776810803430&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=EAAAAAQ&are=1&cid=1041595483.1776810804&frm=0&ir=1&pscdl=noapi&rcb=7&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&tag_exp=0~115616985~115938466~115938468~117227715~117266400~117512543&dl=https%3A%2F%2Fwww.nypl.org%2F&dr=https%3A%2F%2Fwww.nypl.org%2F&sid=1776810803&sct=1&seg=0&dt=The%20New%20York%20Public%20Library&_s=2&tfd=6237www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-P03CNT7C31&gtm=45je64h1v9115477143z86109239za20gzb6109239zd6109239&_p=1776810803430&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=EAAAAAQ&are=1&cid=1041595483.1776810804&frm=0&ir=1&pscdl=noapi&rcb=7&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&tag_exp=0~115616985~115938466~115938468~117227715~117266400~117512543&dl=https%3A%2F%2Fwww.nypl.org%2F&dr=https%3A%2F%2Fwww.nypl.org%2F&sid=1776810803&sct=1&seg=0&dt=The%20New%20York%20Public%20Library&_s=2&tfd=6237 — 204 — 48 B — 38 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 2704ms · 2758KB · $36/mo
a.optmnstr.com
Other
Costly
Execution 468ms
Transfer 1 KB
Monthly Cost $6/mo
www.nypl.org
Other
Costly
Execution 436ms
Transfer 65 KB
Unused 53%
Monthly Cost $6/mo
www.nypl.org
Other
Costly
Execution 413ms
Transfer 67 KB
Monthly Cost $5/mo
ds-header.nypl.org
Other
Costly
Execution 210ms
Transfer 556 KB
Unused 80%
Monthly Cost $3/mo
Unattributable
Other
Optional
Execution 198ms
Transfer 0 KB
Monthly Cost $3/mo
ds-header.nypl.org
Other
Optional
Execution 178ms
Transfer 552 KB
Unused 81%
Monthly Cost $2/mo
www.nypl.org
Other
Optional
Execution 171ms
Transfer 1 KB
Monthly Cost $2/mo
www.nypl.org
Other
Optional
Execution 156ms
Transfer 531 KB
Unused 84%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 143ms
Transfer 172 KB
Unused 37%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 137ms
Transfer 172 KB
Unused 31%
Monthly Cost $2/mo
a.optmnstr.com
Other
Optional
Execution 75ms
Transfer 2 KB
Monthly Cost $1/mo
www.nypl.org
Other
Optional
Execution 65ms
Transfer 26 KB
Monthly Cost $1/mo
www.nypl.org
Other
Optional
Execution 53ms
Transfer 612 KB
Unused 69%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • a.optmnstr.com adds 468ms and costs ~$6/month
  • www.nypl.org adds 436ms and costs ~$6/month
  • www.nypl.org adds 413ms and costs ~$5/month
  • ds-header.nypl.org adds 210ms and costs ~$3/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

a.optmnstr.com takes 468ms 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.nypl.org 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

53% of www.nypl.org'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

www.nypl.org takes 413ms 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

ds-header.nypl.org takes 210ms 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

80% of ds-header.nypl.org'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

81% of ds-header.nypl.org'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

84% of www.nypl.org's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

69% of www.nypl.org'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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