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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

41
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.
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.

4.84 s

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

16.13 s

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

972 ms

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

0.001

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

4.91 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.

16.39 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
17
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
2.8 MB transferred, 87 requests
FIX
2.8 MB transferred, 87 requests
Warning::
Page weighs 5.3 MB (2.8 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 830 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 830 KB
Info::
87 HTTP requests
Info::
Estimated 0.58 g CO2 per page load
2.8 MB / 2.4 MB budget
2.8 MB transferred
87 requests
0.58 g CO2 per page load
Images 1.6 MiB 59%
JavaScript 830.2 KiB 29%
Fonts 165.9 KiB 6%
CSS 118.0 KiB 4%
HTML 47.2 KiB 2%
Other 2.4 KiB 0%
Other 2.1 KiB 0%
Other 591 B 0%
Other 559 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

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 (2.8 MiB of 2.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4159ms total JS execution
FIX
4159ms total JS execution
Warning::
https://www.stanford.edu/: 1079ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-T4N...: 464ms CPU time
Warning::
Unattributable: 426ms CPU time
Warning::
https://siteimproveanalytics.com/js/siteanalyze_80...: 360ms CPU time
Warning::
https://www.stanford.edu/wp-content/themes/homesit...: 360ms CPU time
Warning::
Third-party scripts: 4159ms (100% of total)

Main Thread Breakdown

Script Evaluation 47% Style & Layout 22% Other 17% Script Parsing & Compilation 8% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.stanford.edu/1079ms107ms26ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T4N2WTT464ms397ms61ms3rd
Unattributable426ms25ms0ms3rd
https://siteimproveanalytics.com/js/siteanalyze_80352.js360ms78ms9ms3rd
https://www.stanford.edu/wp-content/themes/homesite17/js/dist/master.min.js?ver=2021.04.15.11.26360ms229ms9ms3rd
https://www.googletagmanager.com/gtag/js?id=G-RBCPHN00S7&cx=c&gtm=4e64f0287ms233ms52ms3rd
https://www.googletagmanager.com/gtag/js?id=G-E08J4Q7DG7&cx=c&_slc=1271ms217ms52ms3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js179ms146ms28ms3rd
https://js-agent.newrelic.com/nr-spa-1.312.1.min.js170ms137ms11ms3rd
https://connect.facebook.net/en_US/fbevents.js158ms114ms43ms3rd

Showing top 10 of 14 scripts

D
Page Weight Inventory
Action
87 resources · 2.8 MB · 263 KB savings available
FIX
87 resources · 2.8 MB · 263 KB savings available
Warning::
Page weight 1.8 MB over 1MB target
Got: 2.8 MB Expected: ≤ 1 MB
Info::
~263 KB of savings available
Warning::
86 third-party resources (100% of weight)
Info::
1 resources over 200KB
87 resources · 2.8 MiB · 86 third-party 1.8 MiB over 1MB target
Image 59% · 1.7 MiB
JavaScript 29% · 830.2 KiB
Font 6% · 165.9 KiB
CSS 4% · 118.0 KiB
Document 2% · 47.4 KiB
Other 0% · 2.3 KiB

~262.5 KiB of savings available

Remove unused JavaScript: 262.5 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

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

C
Image Optimization
Action
38 images, 0 KB saveable
REVIEW
38 images, 0 KB saveable
Warning::
https://www.stanford.edu/wp-content/uploads/2025/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stanford.edu/wp-content/uploads/2025/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stanford.edu/wp-content/uploads/2022/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stanford.edu/wp-content/uploads/2022/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stanford.edu/wp-content/uploads/2024/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stanford.edu/wp-content/uploads/2025/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stanford.edu/wp-content/uploads/2022/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stanford.edu/wp-content/uploads/2021/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stanford.edu/wp-content/uploads/2025/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stanford.edu/wp-content/uploads/2022/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stanford.edu/wp-content/uploads/2025/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stanford.edu/wp-content/uploads/2025/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stanford.edu/wp-content/uploads/2022/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stanford.edu/wp-content/uploads/2025/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stanford.edu/wp-content/uploads/2025/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stanford.edu/wp-content/uploads/2023/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stanford.edu/wp-content/uploads/2022/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stanford.edu/wp-content/uploads/2022/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stanford.edu/wp-content/uploads/2023/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stanford.edu/wp-content/uploads/2022/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stanford.edu/wp-content/uploads/2023/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stanford.edu/wp-content/uploads/2023/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
38 images 1.6 MB
0 oversized -0 KB
8 legacy format
22 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Bundles
Action
20 scripts, 263 KB unused
REVIEW
20 scripts, 263 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-T4N...: 65 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-E08J...: 64 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-RBCP...: 62 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://script.hotjar.com/modules.6a0f3932cb1341a3...: 38 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/en_US/fbevents.js: 34 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 263 KB
263 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-T4N2WTT161 KB65 KB (41%)3rd
https://www.googletagmanager.com/gtag/js?id=G-E08J4Q7DG7&cx=c&_slc=1148 KB64 KB (43%)3rd
https://www.googletagmanager.com/gtag/js?id=G-RBCPHN00S7&cx=c&gtm=4e64f0148 KB62 KB (42%)3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js57 KB38 KB (67%)3rd
https://connect.facebook.net/en_US/fbevents.js96 KB34 KB (36%)3rd
https://www.stanford.edu/wp-content/plugins/awesome-weather-pro/js/js-cookie.js?ver=1.11 KB3rd
https://www.stanford.edu/wp-content/plugins/stanford-fb-pixel/pixel.js?ver=1.0.11 KB3rd
https://events.stanford.edu/widget/view?schools=stanford&days=31&num=4&sponsored=1&container=localist-widget-6803070&template=stanford-4-column-cards18 KB3rd
https://siteimproveanalytics.com/js/siteanalyze_80352.js20 KB3rd
https://www.stanford.edu/wp-includes/js/jquery/jquery.min.js?ver=3.7.135 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

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
8 fonts (166 KB)
PASS
8 fonts (166 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

166 KB total

Render-blocking

0

of 8

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 FCP 4.8 s LCP 16.1 shttps://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff26xK3dSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff2 — 14.5 KiB — 5 ms — font-display: swaphttps://www.stanford.edu/wp-content/themes/homesite17/fonts/Stanford.ttf?a9awv8Stanford.ttf https://www.stanford.edu/wp-content/themes/homesite17/fonts/Stanford.ttf?a9awv8 — 4.5 KiB — 19 ms — font-display: swaphttps://www.stanford.edu/wp-content/themes/homesite17/fonts/fontawesome-webfont.woff2?v=4.7.0fontawesome-webfont.woff2 https://www.stanford.edu/wp-content/themes/homesite17/fonts/fontawesome-webfont.woff2?v=4.7.0 — 75.7 KiB — 26 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu3cOWxw.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu3cOWxw.woff2 — 14.6 KiB — 14 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu3cOWxw.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu3cOWxw.woff2 — 14.4 KiB — 15 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3iu4nwlxdu3cOWxw.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3iu4nwlxdu3cOWxw.woff2 — 13.9 KiB — 24 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ik4zwlxdu3cOWxw.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ik4zwlxdu3cOWxw.woff2 — 14.5 KiB — 21 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xK1dSBYKcSV-LCoeQqfX1RYOo3qPZ7nsDJB9cme.woff26xK1dSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xK1dSBYKcSV-LCoeQqfX1RYOo3qPZ7nsDJB9cme.woff2 — 13.9 KiB — 10 ms — font-display: swap
6xK3dSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 5 ms
Start 574 ms
Risk FOUT — text flashes from fallback to web font
Stanford.ttf ttf swap
Size 5 KB
Load time 19 ms
Start 575 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
fontawesome-webfont.woff2 woff2 swap
Size 76 KB
Load time 26 ms
Start 575 ms
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 14 ms
Start 575 ms
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 14 KB
Load time 15 ms
Start 576 ms
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 14 KB
Load time 24 ms
Start 576 ms
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 14 KB
Load time 21 ms
Start 576 ms
Risk FOUT — text flashes from fallback to web font
6xK1dSBYKcSV-LCoeQqfX1R... woff2 swap
Size 14 KB
Load time 10 ms
Start 576 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 ~1 KB and ~2 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
preload
dns-prefetch
2
prefetch

2 resource hints configured

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
87 requests over 2911ms
INFO
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https://stats.g.doubleclick.net/g/collect?v=2&tid=G-RBCPHN00S7&cid=2138129626.1776360412&gtm=45je64f0v890477239z8810131866za20gzb810131866zd810131866&rcb=14&aip=1&dma=0&gcd=13l3l3l3l1l1&npa=0&frm=0&tag_exp=0~115938466~115938468~117266400 — 204 — 559 B — 38 ms — h2https://script.hotjar.com/modules.6a0f3932cb1341a35c18.jsscript.hotjar.com/modules.6a0f3932c... https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js — 200 — 56.6 KiB — 16 ms — h2https://www.google-analytics.com/g/collect?v=2&tid=G-E08J4Q7DG7&gtm=45je64f0v9168113667za20g&_p=1776360411798&gcd=13l3l3l3l2l1&npa=0&dma=0&_eu=EBAI&are=1&cid=2138129626.1776360412&frm=0&ir=1&pscdl=noapi&rcb=2&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266400~117384406~118463261&dl=https%3A%2F%2Fwww.stanford.edu%2F&dt=Stanford%20University&sid=1776360412&sct=1&seg=0&_tu=wAQ&en=page_view&_fv=1&_ss=1&_ee=1&tfd=1175www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-E08J4Q7DG7&gtm=45je64f0v9168113667za20g&_p=1776360411798&gcd=13l3l3l3l2l1&npa=0&dma=0&_eu=EBAI&are=1&cid=2138129626.1776360412&frm=0&ir=1&pscdl=noapi&rcb=2&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266400~117384406~118463261&dl=https%3A%2F%2Fwww.stanford.edu%2F&dt=Stanford%20University&sid=1776360412&sct=1&seg=0&_tu=wAQ&en=page_view&_fv=1&_ss=1&_ee=1&tfd=1175 — 204 — 20 B — 54 ms — h3https://js-agent.newrelic.com/nr-spa-1.312.1.min.jsjs-agent.newrelic.com/nr-spa-1.312.... https://js-agent.newrelic.com/nr-spa-1.312.1.min.js — 200 — 29.9 KiB — 13 ms — h2https://www-media.stanford.edu/assets/favicon/favicon-32x32.pngwww-media.stanford.edu/assets/favic... https://www-media.stanford.edu/assets/favicon/favicon-32x32.png — 200 — 1.9 KiB — 24 ms — h2https://bam.nr-data.net/1/NRJS-a5e9036dbeb441881bb?a=1123999777&v=1.312.1&to=MlcHYUJVWxFVBxBRCgsdJFZEXVoMGwIWVwsRHxVUV1E%3D&rst=1278&ck=0&s=c32f38c59a98cf49&ref=https://www.stanford.edu/&ptid=9e20bd3846f088af&af=err,spa,xhr,stn,ins&ap=501&be=319&fe=910&dc=381&at=HhAEFwpPSB8%3D&fsh=1&perf=%7B%22timing%22:%7B%22of%22:1776360411372,%22n%22:0,%22f%22:280,%22dn%22:281,%22dne%22:294,%22c%22:294,%22s%22:295,%22ce%22:300,%22rq%22:300,%22rp%22:319,%22rpe%22:322,%22di%22:696,%22ds%22:699,%22de%22:700,%22dc%22:1226,%22l%22:1226,%22le%22:1229%7D,%22navigation%22:%7B%7D%7Dbam.nr-data.net/1/NRJS-a5e9036dbeb4... https://bam.nr-data.net/1/NRJS-a5e9036dbeb441881bb?a=1123999777&v=1.312.1&to=MlcHYUJVWxFVBxBRCgsdJFZEXVoMGwIWVwsRHxVUV1E%3D&rst=1278&ck=0&s=c32f38c59a98cf49&ref=https://www.stanford.edu/&ptid=9e20bd3846f088af&af=err,spa,xhr,stn,ins&ap=501&be=319&fe=910&dc=381&at=HhAEFwpPSB8%3D&fsh=1&perf=%7B%22timing%22:%7B%22of%22:1776360411372,%22n%22:0,%22f%22:280,%22dn%22:281,%22dne%22:294,%22c%22:294,%22s%22:295,%22ce%22:300,%22rq%22:300,%22rp%22:319,%22rpe%22:322,%22di%22:696,%22ds%22:699,%22de%22:700,%22dc%22:1226,%22l%22:1226,%22le%22:1229%7D,%22navigation%22:%7B%7D%7D — 200 — 717 B — 768 ms — http/1.1https://bam.nr-data.net/events/1/NRJS-a5e9036dbeb441881bb?a=1123999777&v=1.312.1&to=MlcHYUJVWxFVBxBRCgsdJFZEXVoMGwIWVwsRHxVUV1E%3D&rst=2058&ck=0&s=c32f38c59a98cf49&ref=https://www.stanford.edu/&ptid=9e20bd3846f088afbam.nr-data.net/events/1/NRJS-a5e90... https://bam.nr-data.net/events/1/NRJS-a5e9036dbeb441881bb?a=1123999777&v=1.312.1&to=MlcHYUJVWxFVBxBRCgsdJFZEXVoMGwIWVwsRHxVUV1E%3D&rst=2058&ck=0&s=c32f38c59a98cf49&ref=https://www.stanford.edu/&ptid=9e20bd3846f088af — 200 — 411 B — 853 ms — http/1.1https://bam.nr-data.net/jserrors/1/NRJS-a5e9036dbeb441881bb?a=1123999777&v=1.312.1&to=MlcHYUJVWxFVBxBRCgsdJFZEXVoMGwIWVwsRHxVUV1E%3D&rst=2060&ck=0&s=c32f38c59a98cf49&ref=https://www.stanford.edu/&ptid=9e20bd3846f088afbam.nr-data.net/jserrors/1/NRJS-a5e... https://bam.nr-data.net/jserrors/1/NRJS-a5e9036dbeb441881bb?a=1123999777&v=1.312.1&to=MlcHYUJVWxFVBxBRCgsdJFZEXVoMGwIWVwsRHxVUV1E%3D&rst=2060&ck=0&s=c32f38c59a98cf49&ref=https://www.stanford.edu/&ptid=9e20bd3846f088af — 200 — 418 B — 23 ms — http/1.1https://bam.nr-data.net/events/1/NRJS-a5e9036dbeb441881bb?a=1123999777&v=1.312.1&to=MlcHYUJVWxFVBxBRCgsdJFZEXVoMGwIWVwsRHxVUV1E%3D&rst=2062&ck=0&s=c32f38c59a98cf49&ref=https://www.stanford.edu/&ptid=9e20bd3846f088afbam.nr-data.net/events/1/NRJS-a5e90... https://bam.nr-data.net/events/1/NRJS-a5e9036dbeb441881bb?a=1123999777&v=1.312.1&to=MlcHYUJVWxFVBxBRCgsdJFZEXVoMGwIWVwsRHxVUV1E%3D&rst=2062&ck=0&s=c32f38c59a98cf49&ref=https://www.stanford.edu/&ptid=9e20bd3846f088af — 200 — 411 B — 62 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 4159ms · 903KB · $55/mo
www.stanford.edu
Other
Costly
Execution 1079ms
Transfer 47 KB
Monthly Cost $14/mo
Google Tag Manager
Tag Manager
Costly
Execution 464ms
Transfer 161 KB
Unused 41%
Monthly Cost $6/mo
Unattributable
Other
Costly
Execution 426ms
Transfer 0 KB
Monthly Cost $6/mo
siteimproveanalytics.com
Other
Costly
Execution 360ms
Transfer 20 KB
Monthly Cost $5/mo
www.stanford.edu
Other
Costly
Execution 360ms
Transfer 23 KB
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 287ms
Transfer 148 KB
Unused 42%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 271ms
Transfer 148 KB
Unused 43%
Monthly Cost $4/mo
Hotjar
Session Replay
Optional
Execution 179ms
Transfer 57 KB
Unused 67%
Monthly Cost $2/mo
js-agent.newrelic.com
Other
Optional
Execution 170ms
Transfer 30 KB
Monthly Cost $2/mo
Facebook Pixel
Advertising
Optional
Execution 158ms
Transfer 96 KB
Unused 36%
Monthly Cost $2/mo
Facebook Pixel
Advertising
Optional
Execution 157ms
Transfer 44 KB
Monthly Cost $2/mo
Google Analytics
Analytics
Optional
Execution 91ms
Transfer 21 KB
Monthly Cost $1/mo
www.stanford.edu
Other
Optional
Execution 83ms
Transfer 73 KB
Monthly Cost $1/mo
www.stanford.edu
Other
Optional
Execution 74ms
Transfer 35 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.stanford.edu adds 1079ms and costs ~$14/month
  • Google Tag Manager adds 464ms and costs ~$6/month
  • Unattributable adds 426ms and costs ~$6/month
  • siteimproveanalytics.com adds 360ms and costs ~$5/month
  • www.stanford.edu adds 360ms and costs ~$5/month
  • Google Tag Manager adds 287ms and costs ~$4/month
  • Google Tag Manager adds 271ms and costs ~$4/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.stanford.edu takes 1079ms 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 464ms 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 426ms 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

siteimproveanalytics.com takes 360ms 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.stanford.edu takes 360ms 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 287ms 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 271ms 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

67% of Hotjar'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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