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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
37
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.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

3.38 s

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

8.51 s

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

1.42 s

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

0.020

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

6.69 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

19.66 s

Page Load Progression

669 ms
1.3 s
2.0 s
2.7 s
3.3 s
4.0 s
4.7 s
5.4 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
7.0 MB transferred, 123 requests
FIX
7.0 MB transferred, 123 requests
Critical::
Page weighs 11.3 MB (7.0 MB transferred)
Warning::
JavaScript is 1.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.5 MB
Warning::
Images are 1.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.3 MB
Info::
Fonts are 220 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 220 KB
Warning::
123 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.5 g CO2 per page load
7.0 MB / 2.4 MB budget
7.0 MB transferred
123 requests
1.5 g CO2 per page load
Other 3.9 MiB 55%
JavaScript 1.5 MiB 21%
Images 1.3 MiB 18%
Fonts 220.1 KiB 3%
CSS 96.6 KiB 1%
HTML 52.4 KiB 1%
Other 9.6 KiB 0%
Other 8.0 KiB 0%
Other 5.0 KiB 0%
Other 563 B 0%
Other 0 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

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

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 (7.0 MiB of 7.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4852ms total JS execution
FIX
4852ms total JS execution
Warning::
Unattributable: 1146ms CPU time
Warning::
https://www.exploratorium.edu/: 1094ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KQZ...: 520ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-QWB2...: 408ms CPU time
Warning::
https://www.googletagmanager.com/gtag/destination?...: 286ms CPU time
Warning::
Third-party scripts: 4852ms (100% of total)

Main Thread Breakdown

Script Evaluation 49% Other 25% Style & Layout 11% Script Parsing & Compilation 10%
ScriptTotalScriptingParse/CompileParty
Unattributable1146ms70ms0ms3rd
https://www.exploratorium.edu/1094ms318ms25ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KQZNKT520ms426ms72ms3rd
https://www.googletagmanager.com/gtag/js?id=G-QWB2BS419M&cx=c&gtm=4e64k0h1408ms338ms67ms3rd
https://www.googletagmanager.com/gtag/destination?id=AW-794145459&cx=c&gtm=4e64k0h1286ms230ms54ms3rd
https://connect.facebook.net/signals/config/1437585953013227?v=2.9.303&r=stable&domain=www.exploratorium.edu&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C168223ms192ms28ms3rd
https://www.exploratorium.edu/sites/default/files/js/js_rb74UpXfxeGBk-XlzWe_JeQgAGL2KQgu2DbRlvvOKys.js?scope=footer&delta=3&language=en&theme=oppenheimer&include=eJyNjlFuxCAMRC8Ey5GQQyaEFjDCJrvt6ZtuvpJupf0ZyW9G4wnc4QKXxhVV5YZHy9xJuadRfAcF9UvnqjlV-LCSTqzWHga1ZkDytedkL5C0wadCEeJ2kr7RzbmPcuScyAuoh9XTUP79naFwbyf9lDl8XppXHl3cC-ZX0PxnyP9xUdIhJjLHDK8UXdzlet_ogx5nWAy3hroiFfSj2h6_bUEdL93Odksz-GTGzBPlEyo8XwgvS6C6kZgt4S7uqc9VPytXurs207ms141ms43ms3rd
https://js-agent.newrelic.com/nr-spa-1.313.1.min.js199ms157ms15ms3rd
https://connect.facebook.net/en_US/fbevents.js199ms148ms50ms3rd
https://www.exploratorium.edu/modules/custom/exploratorium_om/modules/exploratorium_react_frontline_chatbot/components/react_app/react_app.js?tduup7145ms128ms12ms3rd

Showing top 10 of 15 scripts

F
JS Bundles
Action
46 scripts, 749 KB unused
FIX
46 scripts, 749 KB unused
Warning::
https://www.exploratorium.edu/modules/custom/explo...: 344 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.exploratorium.edu/modules/custom/explo...: unminified — 118 KB could be saved
Warning::
https://cdn.jsdelivr.net/npm/hls.js@1.4.12/dist/hl...: 99 KB unused (90%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-QWB2...: 67 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/destination?...: 60 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KQZ...: 59 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 749 KB
749 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.exploratorium.edu/modules/custom/exploratorium_om/modules/exploratorium_react_frontline_chatbot/components/react_app/react_app.js?tduup7448 KB344 KB (77%)✗3rd
https://cdn.jsdelivr.net/npm/hls.js@1.4.12/dist/hls.min.js110 KB99 KB (90%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-QWB2BS419M&cx=c&gtm=4e64k0h1175 KB67 KB (38%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-794145459&cx=c&gtm=4e64k0h1147 KB60 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KQZNKT161 KB59 KB (37%)✓3rd
https://www.exploratorium.edu/sites/default/files/js/js_rb74UpXfxeGBk-XlzWe_JeQgAGL2KQgu2DbRlvvOKys.js?scope=footer&delta=3&language=en&theme=oppenheimer&include=eJyNjlFuxCAMRC8Ey5GQQyaEFjDCJrvt6ZtuvpJupf0ZyW9G4wnc4QKXxhVV5YZHy9xJuadRfAcF9UvnqjlV-LCSTqzWHga1ZkDytedkL5C0wadCEeJ2kr7RzbmPcuScyAuoh9XTUP79naFwbyf9lDl8XppXHl3cC-ZX0PxnyP9xUdIhJjLHDK8UXdzlet_ogx5nWAy3hroiFfSj2h6_bUEdL93Odksz-GTGzBPlEyo8XwgvS6C6kZgt4S7uqc9VPytXurs99 KB47 KB (47%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB30 KB (31%)✓3rd
https://www.exploratorium.edu/core/assets/vendor/jquery/jquery.min.js?v=4.0.032 KB22 KB (69%)✓3rd
https://static.sojern.com/sdk/latest/sojern.min.js44 KB21 KB (48%)✓3rd
https://www.exploratorium.edu/themes/custom/oppenheimer/dist/js/exploratorium/site-search/site-search.js?tduup71 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

F
Page Weight Inventory
Action
123 resources · 7.0 MB · 749 KB savings available
FIX
123 resources · 7.0 MB · 749 KB savings available
Warning::
Page weight 6.0 MB over 1MB target
Got: 7.0 MB Expected: ≤ 1 MB
Info::
~749 KB of savings available
Warning::
122 third-party resources (100% of weight)
Info::
5 resources over 200KB
123 resources · 7.0 MiB · 122 third-party 6.0 MiB over 1MB target
Media 55% · 3.9 MiB
JavaScript 21% · 1.5 MiB
Image 18% · 1.3 MiB
Font 3% · 220.1 KiB
CSS 1% · 96.6 KiB
Document 1% · 56.1 KiB
Other 0% · 9.6 KiB

~748.8 KiB of savings available

Remove unused JavaScript: 748.8 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Image Optimization
20 images, 0 KB saveable
REVIEW
20 images, 0 KB saveable
Info::
All images are well-optimized
20 images 1.3 MB
0 oversized -0 KB
9 legacy format
0 missing dimensions CLS risk
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
7 fonts (220 KB)
PASS
7 fonts (220 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

220 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 3.4 s LCP 8.5 shttps://use.typekit.net/af/3e45c4/0000000000000000000135bb/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n3&v=3l https://use.typekit.net/af/3e45c4/0000000000000000000135bb/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n3&v=3 — 18.0 KiB — 20 ms — font-display: swaphttps://use.typekit.net/af/e09cc0/0000000000000000000135bf/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/e09cc0/0000000000000000000135bf/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 17.9 KiB — 25 ms — font-display: swaphttps://use.typekit.net/af/2b0f48/0000000000000000000135bc/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i3&v=3l https://use.typekit.net/af/2b0f48/0000000000000000000135bc/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i3&v=3 — 18.7 KiB — 23 ms — font-display: swaphttps://use.typekit.net/af/309298/0000000000000000000135b4/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/309298/0000000000000000000135b4/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 18.3 KiB — 10 ms — font-display: swaphttps://use.typekit.net/af/f07d0a/0000000000000000000135bd/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3l https://use.typekit.net/af/f07d0a/0000000000000000000135bd/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3 — 18.3 KiB — 6 ms — font-display: swaphttps://www.exploratorium.edu/themes/custom/oppenheimer/libraries/bootstrap-icons/fonts/bootstrap-icons.woff2?8d200481aa7f02a2d63a331fc782cfaf=bootstrap-icons.woff2 https://www.exploratorium.edu/themes/custom/oppenheimer/libraries/bootstrap-icons/fonts/bootstrap-icons.woff2?8d200481aa7f02a2d63a331fc782cfaf= — 110.4 KiB — 60 ms — font-display: swaphttps://use.typekit.net/af/84cfef/0000000000000000000135ba/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i4&v=3l https://use.typekit.net/af/84cfef/0000000000000000000135ba/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i4&v=3 — 18.6 KiB — 8 ms — font-display: swap
l woff2 swap
Size 18 KB
Load time 20 ms
Start 207 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 18 KB
Load time 25 ms
Start 208 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 19 KB
Load time 23 ms
Start 208 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 18 KB
Load time 10 ms
Start 306 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 18 KB
Load time 6 ms
Start 307 ms
Risk FOUT — text flashes from fallback to web font
bootstrap-icons.woff2 woff2 swap
Size 110 KB
Load time 60 ms
Start 307 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
l woff2 swap
Size 19 KB
Load time 8 ms
Start 307 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)

Fixing the unchecked items could save ~55 KB and ~110 ms

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
Network Waterfall
123 requests over 3052ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 3.4 s LCP 8.5 shttps://exploratorium.edu// https://exploratorium.edu/ — 301 — 213 B — 18 ms — h2https://www.exploratorium.edu/www.exploratorium.edu/ https://www.exploratorium.edu/ — 200 — 52.0 KiB — 35 ms — h2https://use.typekit.net/lhs0rdy.cssuse.typekit.net/lhs0rdy.css https://use.typekit.net/lhs0rdy.css — 200 — 1.1 KiB — 38 ms — h2https://www.exploratorium.edu/sites/default/files/css/css_YCZZxivODCETOVErmSPSdXpLwGbvOvQQU4BmibCjeiM.css?delta=0&language=en&theme=oppenheimer&include=eJyNjkEOQiEMRC_EhyORAvWDAdq0Rb-3N2qMMXHhZhZvJi-TSTBkGkwTp6nHgzsJGElbIwpCtngSmtbbxJgrWCLbtlcBzC4_BEUWQ_dwhsN9Gyot0fCDxYpQUP6eq4EtdcSMs2IbKGHvlKA7BoFdgKu-f3yIX5NX6k0rFqc3NRwhgaK7NLxqeKYfVFbHOwXBawAwww.exploratorium.edu/sites/default... 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— 200 — 337 B — 128 ms — 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https://www.google.com/pagead/1p-conversion/794145459/?random=1633253506&cv=11&fst=1776891282628&bg=ffffff&guid=ON&async=1&en=conversion&gtm=45be64k0h1v9175386273z86773150za20gzb6773150zd6773150xea&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115616985~115938466~115938468~117266401&u_w=412&u_h=823&url=https%3A%2F%2Fwww.exploratorium.edu%2F&rcb=10&label=MBWoCObvnIwBELPl1voC&capi=1&frm=0&tiba=Experience%20the%20Exploratorium%20at%20Pier%2015&value=0&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=1745647815.1776891282&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=1&uam=moto%20g%20power%20(2022)&uap=Android&uapv=11.0&uaw=0&ec_mode=a&_tu=CA&gcl_ctr=1~0~0~0&category=acrcp_v1_512&em=tv.1&fmt=8&ct_cookie_present=false&crd=CLTesQII8t-xAgit4bECCKG4sQIIscGxAgiwwbECCLHDsQIIisWxAgjCybECCLTGsQIIk9qxAgjb3LECCIfbsQII08WxAgjrzLECCO3OsQII1c-xAgj02rECCJfUsQIIyduxAgix4bECCLPhsQIIpt2xAgiw3rECCIDbsQJKGXRyaWdnZXI9bmF2aWdhdGlvbi1zb3VyY2VaAwoBAWIDCgED&cerd=CgEA&fsk=ChEI8OOhzwYQy-2I0MH1tu65ARIsADfqr1UFkqTqaFfUJ0okBeGVYraRObOGzTTHZWw0mMAhqdmI-8PyvXwMr8MaAkGt&pscrd=IhMI_aHZ7auClAMVfoNhBh0GHRXFMgwIA2IICAAQABgAIAAyDAgEYggIABAAGAAgADIMCAdiCAgAEAAYACAAMgwICGIICAAQABgAIAAyDAgJYggIABAAGAAgADIMCApiCAgAEAAYACAAMgwIAmIICAAQABgAIAAyDAgLYggIABAAGAAgADIMCBViCAgAEAAYACAAMgwIH2IICAAQABgAIAAyDAgTYggIABAAGAAgADIMCBJiCAgAEAAYACAAOh5odHRwczovL3d3dy5leHBsb3JhdG9yaXVtLmVkdS9CV0NoRUk4T09oendZUTFjaWp4NC1nbDRhVkFSSXNBSThFS1oxdmVFYVhBRTlkRTFfWktLaElZM0VqMlpLZEs5VldCVzNpbS1oRFgtaVN0ZXp6eE10b1BINHoMCAliCAgAEAAYACAA&is_vtc=1&cid=CAQSyAEABaugfa6vrxfbHxRGnqgrMMExEydJLqSK-g-oygNZcC2yyV7Cqu-th-CrR1vYPFVsQXYDUgLzSjsE0RadomfaZqK7LUu1qjtNSBUqckBahIiYSFywYTXrSto0bRr-QJWUgNrLq__vC1zgc0KZCGmqEjIHQ1Q2h-njz8jgF_VLBgarub9fuq5JVnX20798uWEMHizpGUAtRybNrp2ziIVDeLYNB1KmznpEzegH_DPDCOyvh3_TlWavO7nmQRv37pl-_9YIw1wxtg&eitems=ChAI8OOhzwYQnf3X0YH146MTEh0AvW1FkYrtP8LP5pw217_Vr8yQ_yHCNcGabAZQEg&random=1894644699 — 302 — 22 B — 258 ms — h3https://ib.adnxs.com/bounce?%2Fpx%3Fconsent%3D1%26id%3D1962746%26t%3D1ib.adnxs.com/bounce?%2Fpx%3Fconsent... https://ib.adnxs.com/bounce?%2Fpx%3Fconsent%3D1%26id%3D1962746%26t%3D1 — 200 — 891 B — 130 ms — h2https://ib.adnxs.com/bounce?%2Fseg%3Fadd%3D42393455%26consent%3D1%26t%3D1ib.adnxs.com/bounce?%2Fseg%3Fadd%3D... https://ib.adnxs.com/bounce?%2Fseg%3Fadd%3D42393455%26consent%3D1%26t%3D1 — 200 — 890 B — 130 ms — h2https://www.google.com.br/pagead/1p-conversion/794145459/?random=1633253506&cv=11&fst=1776891282628&bg=ffffff&guid=ON&async=1&en=conversion&gtm=45be64k0h1v9175386273z86773150za20gzb6773150zd6773150xea&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115616985~115938466~115938468~117266401&u_w=412&u_h=823&url=https%3A%2F%2Fwww.exploratorium.edu%2F&rcb=10&label=MBWoCObvnIwBELPl1voC&capi=1&frm=0&tiba=Experience%20the%20Exploratorium%20at%20Pier%2015&value=0&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=1745647815.1776891282&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=1&uam=moto%20g%20power%20(2022)&uap=Android&uapv=11.0&uaw=0&ec_mode=a&_tu=CA&gcl_ctr=1~0~0~0&category=acrcp_v1_512&em=tv.1&fmt=8&ct_cookie_present=false&crd=CLTesQII8t-xAgit4bECCKG4sQIIscGxAgiwwbECCLHDsQIIisWxAgjCybECCLTGsQIIk9qxAgjb3LECCIfbsQII08WxAgjrzLECCO3OsQII1c-xAgj02rECCJfUsQIIyduxAgix4bECCLPhsQIIpt2xAgiw3rECCIDbsQJKGXRyaWdnZXI9bmF2aWdhdGlvbi1zb3VyY2VaAwoBAWIDCgED&cerd=CgEA&fsk=ChEI8OOhzwYQy-2I0MH1tu65ARIsADfqr1UFkqTqaFfUJ0okBeGVYraRObOGzTTHZWw0mMAhqdmI-8PyvXwMr8MaAkGt&is_vtc=1&cid=CAQSyAEABaugfa6vrxfbHxRGnqgrMMExEydJLqSK-g-oygNZcC2yyV7Cqu-th-CrR1vYPFVsQXYDUgLzSjsE0RadomfaZqK7LUu1qjtNSBUqckBahIiYSFywYTXrSto0bRr-QJWUgNrLq__vC1zgc0KZCGmqEjIHQ1Q2h-njz8jgF_VLBgarub9fuq5JVnX20798uWEMHizpGUAtRybNrp2ziIVDeLYNB1KmznpEzegH_DPDCOyvh3_TlWavO7nmQRv37pl-_9YIw1wxtg&eitems=ChAI8OOhzwYQnf3X0YH146MTEh0AvW1FkYrtP8LP5pw217_Vr8yQ_yHCNcGabAZQEg&random=1894644699&ipr=y&pscrd=IhMI_aHZ7auClAMVfoNhBh0GHRXFMgwIA2IICAAQABgAIAAyDAgEYggIABAAGAAgADIMCAdiCAgAEAAYACAAMgwICGIICAAQABgAIAAyDAgJYggIABAAGAAgADIMCApiCAgAEAAYACAAMgwIAmIICAAQABgAIAAyDAgLYggIABAAGAAgADIMCBViCAgAEAAYACAAMgwIH2IICAAQABgAIAAyDAgTYggIABAAGAAgADIMCBJiCAgAEAAYACAAOh5odHRwczovL3d3dy5leHBsb3JhdG9yaXVtLmVkdS9CV0NoRUk4T09oendZUTFjaWp4NC1nbDRhVkFSSXNBSThFS1oxdmVFYVhBRTlkRTFfWktLaElZM0VqMlpLZEs5VldCVzNpbS1oRFgtaVN0ZXp6eE10b1BINHoMCAliCAgAEAAYACAAggEFcAGIAQEwww.google.com.br/pagead/1p-convers... https://www.google.com.br/pagead/1p-conversion/794145459/?random=1633253506&cv=11&fst=1776891282628&bg=ffffff&guid=ON&async=1&en=conversion&gtm=45be64k0h1v9175386273z86773150za20gzb6773150zd6773150xea&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115616985~115938466~115938468~117266401&u_w=412&u_h=823&url=https%3A%2F%2Fwww.exploratorium.edu%2F&rcb=10&label=MBWoCObvnIwBELPl1voC&capi=1&frm=0&tiba=Experience%20the%20Exploratorium%20at%20Pier%2015&value=0&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=1745647815.1776891282&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=1&uam=moto%20g%20power%20(2022)&uap=Android&uapv=11.0&uaw=0&ec_mode=a&_tu=CA&gcl_ctr=1~0~0~0&category=acrcp_v1_512&em=tv.1&fmt=8&ct_cookie_present=false&crd=CLTesQII8t-xAgit4bECCKG4sQIIscGxAgiwwbECCLHDsQIIisWxAgjCybECCLTGsQIIk9qxAgjb3LECCIfbsQII08WxAgjrzLECCO3OsQII1c-xAgj02rECCJfUsQIIyduxAgix4bECCLPhsQIIpt2xAgiw3rECCIDbsQJKGXRyaWdnZXI9bmF2aWdhdGlvbi1zb3VyY2VaAwoBAWIDCgED&cerd=CgEA&fsk=ChEI8OOhzwYQy-2I0MH1tu65ARIsADfqr1UFkqTqaFfUJ0okBeGVYraRObOGzTTHZWw0mMAhqdmI-8PyvXwMr8MaAkGt&is_vtc=1&cid=CAQSyAEABaugfa6vrxfbHxRGnqgrMMExEydJLqSK-g-oygNZcC2yyV7Cqu-th-CrR1vYPFVsQXYDUgLzSjsE0RadomfaZqK7LUu1qjtNSBUqckBahIiYSFywYTXrSto0bRr-QJWUgNrLq__vC1zgc0KZCGmqEjIHQ1Q2h-njz8jgF_VLBgarub9fuq5JVnX20798uWEMHizpGUAtRybNrp2ziIVDeLYNB1KmznpEzegH_DPDCOyvh3_TlWavO7nmQRv37pl-_9YIw1wxtg&eitems=ChAI8OOhzwYQnf3X0YH146MTEh0AvW1FkYrtP8LP5pw217_Vr8yQ_yHCNcGabAZQEg&random=1894644699&ipr=y&pscrd=IhMI_aHZ7auClAMVfoNhBh0GHRXFMgwIA2IICAAQABgAIAAyDAgEYggIABAAGAAgADIMCAdiCAgAEAAYACAAMgwICGIICAAQABgAIAAyDAgJYggIABAAGAAgADIMCApiCAgAEAAYACAAMgwIAmIICAAQABgAIAAyDAgLYggIABAAGAAgADIMCBViCAgAEAAYACAAMgwIH2IICAAQABgAIAAyDAgTYggIABAAGAAgADIMCBJiCAgAEAAYACAAOh5odHRwczovL3d3dy5leHBsb3JhdG9yaXVtLmVkdS9CV0NoRUk4T09oendZUTFjaWp4NC1nbDRhVkFSSXNBSThFS1oxdmVFYVhBRTlkRTFfWktLaElZM0VqMlpLZEs5VldCVzNpbS1oRFgtaVN0ZXp6eE10b1BINHoMCAliCAgAEAAYACAAggEFcAGIAQE — 200 — 20 B — 75 ms — h3https://p.relay-t.io/beat.js?type=tg&idhotel=idH&pmsId=pms&tkraw=&tk=&ref=https%3A%2F%2Fwww.exploratorium.edu%2Fp.relay-t.io/beat.js?type=tg&idhote... https://p.relay-t.io/beat.js?type=tg&idhotel=idH&pmsId=pms&tkraw=&tk=&ref=https%3A%2F%2Fwww.exploratorium.edu%2F — 200 — 561 B — 222 ms — h2https://js-agent.newrelic.com/nr-spa-1.313.1.min.jsjs-agent.newrelic.com/nr-spa-1.313.... https://js-agent.newrelic.com/nr-spa-1.313.1.min.js — 200 — 30.3 KiB — 34 ms — h2https://insight.adsrvr.org/track/cei?advertiser_id=kyjiutn&cookie_sync=1&upv=3.0.0&upid=hclw2c7&ref=https://www.exploratorium.edu/insight.adsrvr.org/track/cei?advert... https://insight.adsrvr.org/track/cei?advertiser_id=kyjiutn&cookie_sync=1&upv=3.0.0&upid=hclw2c7&ref=https://www.exploratorium.edu/ — 302 — 279 B — 14 ms — h2https://match.adsrvr.org/track/cei?advertiser_id=kyjiutn&cookie_sync=1&upv=3.0.0&upid=hclw2c7&ref=https%3a%2f%2fwww.exploratorium.edu&redirect=1match.adsrvr.org/track/cei?advertis... https://match.adsrvr.org/track/cei?advertiser_id=kyjiutn&cookie_sync=1&upv=3.0.0&upid=hclw2c7&ref=https%3a%2f%2fwww.exploratorium.edu&redirect=1 — 200 — 369 B — 9 ms — h2https://bam.nr-data.net/1/NRJS-0cb71eaf3399e4451ff?a=1065512249&v=1.313.1&to=ZVBUMRBXVxFQBUIMX1wadwYWX1YMHiJEEEBTWWoLDVJcPnIJWBFCXVlaABBqdw1VA2AMVUV2WQsWRFYOXQNESA5EXFMS&rst=2210&ck=0&s=78b45cbeaa78553f&ref=https://www.exploratorium.edu/&ptid=1ea3ba37d0a02acb&af=err,spa,xhr,stn,ins&ap=3015&be=52&fe=2099&dc=484&at=SRdXR1hNRB8%3D&fsh=1&perf=%7B%22timing%22:%7B%22of%22:1776891281410,%22n%22:0,%22f%22:20,%22dn%22:21,%22dne%22:26,%22c%22:26,%22s%22:28,%22ce%22:34,%22rq%22:34,%22rp%22:53,%22rpe%22:56,%22di%22:477,%22ds%22:520,%22de%22:536,%22dc%22:2144,%22l%22:2146,%22le%22:2151%7D,%22navigation%22:%7B%7D%7D&fp=216&fcp=216bam.nr-data.net/1/NRJS-0cb71eaf3399... https://bam.nr-data.net/1/NRJS-0cb71eaf3399e4451ff?a=1065512249&v=1.313.1&to=ZVBUMRBXVxFQBUIMX1wadwYWX1YMHiJEEEBTWWoLDVJcPnIJWBFCXVlaABBqdw1VA2AMVUV2WQsWRFYOXQNESA5EXFMS&rst=2210&ck=0&s=78b45cbeaa78553f&ref=https://www.exploratorium.edu/&ptid=1ea3ba37d0a02acb&af=err,spa,xhr,stn,ins&ap=3015&be=52&fe=2099&dc=484&at=SRdXR1hNRB8%3D&fsh=1&perf=%7B%22timing%22:%7B%22of%22:1776891281410,%22n%22:0,%22f%22:20,%22dn%22:21,%22dne%22:26,%22c%22:26,%22s%22:28,%22ce%22:34,%22rq%22:34,%22rp%22:53,%22rpe%22:56,%22di%22:477,%22ds%22:520,%22de%22:536,%22dc%22:2144,%22l%22:2146,%22le%22:2151%7D,%22navigation%22:%7B%7D%7D&fp=216&fcp=216 — 200 — 734 B — 407 ms — http/1.1https://js.adsrvr.org/universal_pixel.jsjs.adsrvr.org/universal_pixel.js https://js.adsrvr.org/universal_pixel.js — 200 — 957 B — 12 ms — http/1.1https://www.exploratorium.edu/themes/custom/oppenheimer/favicon.icowww.exploratorium.edu/themes/custom... https://www.exploratorium.edu/themes/custom/oppenheimer/favicon.ico — 200 — 761 B — 14 ms — h3https://bam.nr-data.net/events/1/NRJS-0cb71eaf3399e4451ff?a=1065512249&v=1.313.1&to=ZVBUMRBXVxFQBUIMX1wadwYWX1YMHiJEEEBTWWoLDVJcPnIJWBFCXVlaABBqdw1VA2AMVUV2WQsWRFYOXQNESA5EXFMS&rst=2631&ck=0&s=78b45cbeaa78553f&ref=https://www.exploratorium.edu/&ptid=1ea3ba37d0a02acbbam.nr-data.net/events/1/NRJS-0cb71... https://bam.nr-data.net/events/1/NRJS-0cb71eaf3399e4451ff?a=1065512249&v=1.313.1&to=ZVBUMRBXVxFQBUIMX1wadwYWX1YMHiJEEEBTWWoLDVJcPnIJWBFCXVlaABBqdw1VA2AMVUV2WQsWRFYOXQNESA5EXFMS&rst=2631&ck=0&s=78b45cbeaa78553f&ref=https://www.exploratorium.edu/&ptid=1ea3ba37d0a02acb — 200 — 418 B — 178 ms — http/1.1https://bam.nr-data.net/jserrors/1/NRJS-0cb71eaf3399e4451ff?a=1065512249&v=1.313.1&to=ZVBUMRBXVxFQBUIMX1wadwYWX1YMHiJEEEBTWWoLDVJcPnIJWBFCXVlaABBqdw1VA2AMVUV2WQsWRFYOXQNESA5EXFMS&rst=2633&ck=0&s=78b45cbeaa78553f&ref=https://www.exploratorium.edu/&ptid=1ea3ba37d0a02acbbam.nr-data.net/jserrors/1/NRJS-0cb... https://bam.nr-data.net/jserrors/1/NRJS-0cb71eaf3399e4451ff?a=1065512249&v=1.313.1&to=ZVBUMRBXVxFQBUIMX1wadwYWX1YMHiJEEEBTWWoLDVJcPnIJWBFCXVlaABBqdw1VA2AMVUV2WQsWRFYOXQNESA5EXFMS&rst=2633&ck=0&s=78b45cbeaa78553f&ref=https://www.exploratorium.edu/&ptid=1ea3ba37d0a02acb — 200 — 418 B — 295 ms — http/1.1https://bam.nr-data.net/events/1/NRJS-0cb71eaf3399e4451ff?a=1065512249&v=1.313.1&to=ZVBUMRBXVxFQBUIMX1wadwYWX1YMHiJEEEBTWWoLDVJcPnIJWBFCXVlaABBqdw1VA2AMVUV2WQsWRFYOXQNESA5EXFMS&rst=2636&ck=0&s=78b45cbeaa78553f&ref=https://www.exploratorium.edu/&ptid=1ea3ba37d0a02acbbam.nr-data.net/events/1/NRJS-0cb71... https://bam.nr-data.net/events/1/NRJS-0cb71eaf3399e4451ff?a=1065512249&v=1.313.1&to=ZVBUMRBXVxFQBUIMX1wadwYWX1YMHiJEEEBTWWoLDVJcPnIJWBFCXVlaABBqdw1VA2AMVUV2WQsWRFYOXQNESA5EXFMS&rst=2636&ck=0&s=78b45cbeaa78553f&ref=https://www.exploratorium.edu/&ptid=1ea3ba37d0a02acb — 200 — 413 B — 416 ms — http/1.1
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 4852ms · 1516KB · $64/mo
Unattributable
Other
Costly
Execution 1146ms
Transfer 0 KB
Monthly Cost $15/mo
www.exploratorium.edu
Other
Costly
Execution 1094ms
Transfer 52 KB
Monthly Cost $15/mo
Google Tag Manager
Tag Manager
Costly
Execution 520ms
Transfer 161 KB
Unused 37%
Monthly Cost $7/mo
Google Tag Manager
Tag Manager
Costly
Execution 408ms
Transfer 175 KB
Unused 38%
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 286ms
Transfer 147 KB
Unused 41%
Monthly Cost $4/mo
Facebook Pixel
Advertising
Costly
Execution 223ms
Transfer 48 KB
Monthly Cost $3/mo
www.exploratorium.edu
Other
Costly
Execution 207ms
Transfer 99 KB
Unused 47%
Monthly Cost $3/mo
js-agent.newrelic.com
Other
Optional
Execution 199ms
Transfer 30 KB
Monthly Cost $3/mo
Facebook Pixel
Advertising
Optional
Execution 199ms
Transfer 97 KB
Unused 31%
Monthly Cost $3/mo
www.exploratorium.edu
Other
Optional
Execution 145ms
Transfer 448 KB
Unused 77%
Monthly Cost $2/mo
tags.srv.stackadapt.com
Other
Optional
Execution 111ms
Transfer 8 KB
Monthly Cost $1/mo
static.sojern.com
Other
Optional
Execution 101ms
Transfer 44 KB
Unused 48%
Monthly Cost $1/mo
www.exploratorium.edu
Other
Optional
Execution 89ms
Transfer 93 KB
Monthly Cost $1/mo
jsDelivr
CDN
Optional
Execution 71ms
Transfer 110 KB
Unused 90%
Monthly Cost $1/mo
cdn.mgln.ai
Other
Optional
Execution 53ms
Transfer 3 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 1146ms and costs ~$15/month
  • www.exploratorium.edu adds 1094ms and costs ~$15/month
  • Google Tag Manager adds 520ms and costs ~$7/month
  • Google Tag Manager adds 408ms and costs ~$5/month
  • Google Tag Manager adds 286ms and costs ~$4/month
  • Facebook Pixel adds 223ms and costs ~$3/month
  • www.exploratorium.edu adds 207ms 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

Unattributable takes 1146ms 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.exploratorium.edu takes 1094ms 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 520ms 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 408ms 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 286ms 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

Facebook Pixel takes 223ms 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.exploratorium.edu takes 207ms 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

77% of www.exploratorium.edu'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

90% of jsDelivr'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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