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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
4
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
39
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
87
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
75
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.

2.49 s

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

9.46 s

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

186 ms

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

0.947

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

6.51 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.

14.70 s

Page Load Progression

2.0 s
4.0 s
6.0 s
8.1 s
10.1 s
12.1 s
14.1 s
16.1 s
Checks
17
8 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
8.3 MB transferred, 101 requests
FIX
8.3 MB transferred, 101 requests
Critical::
Page weighs 11.4 MB (8.3 MB transferred)
Warning::
Images are 7.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 7.3 MB
Warning::
JavaScript is 776 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 776 KB
Warning::
101 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.7 g CO2 per page load
8.3 MB / 2.4 MB budget
8.3 MB transferred
101 requests
1.7 g CO2 per page load
Images 7.3 MiB 88%
JavaScript 776.2 KiB 9%
Fonts 99.1 KiB 1%
CSS 63.8 KiB 1%
Other 25.0 KiB 0%
HTML 19.1 KiB 0%
Other 5.4 KiB 0%
Other 318 B 0%
Other 0 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

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

F
JS Execution Cost
Action
4339ms total JS execution
FIX
4339ms total JS execution
Warning::
https://sjsu.edu/: 2118ms CPU time
Warning::
Unattributable: 1007ms CPU time
Warning::
https://script.crazyegg.com/pages/versioned/common...: 290ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PMN...: 276ms CPU time
Info::
https://www.google.com/cse/static/element/dc329f57...: 127ms CPU time
Info::
Third-party scripts: 1999ms (46% of total)

Main Thread Breakdown

Other 41% Script Evaluation 26% Style & Layout 13% Rendering 13% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://sjsu.edu/2118ms112ms6ms1st
Unattributable1007ms15ms0ms3rd
https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js290ms258ms12ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PMNG6XV276ms220ms41ms3rd
https://www.google.com/cse/static/element/dc329f57de078f5d/cse_element__en.js?usqp=CAM%3D127ms94ms24ms3rd
https://sjsu.edu/aspis/js/vendor/foundation.js127ms88ms37ms1st
https://sjsu.edu/aspis/js/vendor/jquery.js95ms37ms23ms1st
https://script.crazyegg.com/pages/versioned/tracking-scripts/158692313dc4b9f2e28d9e9025e38d6b.js81ms74ms6ms3rd
https://cse.google.com/adsense/search/async-ads.js81ms43ms34ms3rd
https://www.sjsu.edu/_resources/js/vendor/sjsu-vimeo-playlist.js?v=1.270ms61ms1ms3rd

Showing top 10 of 11 scripts

D
JS Bundles
Action
27 scripts, 315 KB unused
FIX
27 scripts, 315 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PMN...: 87 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://siteimproveanalytics.com/js/siteanalyze_66...: 72 KB unused (81%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.google.com/cse/static/element/dc329f57...: 52 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cse.google.com/adsense/search/async-ads.js: 32 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://script.crazyegg.com/pages/versioned/common...: 28 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 315 KB
315 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-PMNG6XV181 KB87 KB (48%)✓3rd
https://siteimproveanalytics.com/js/siteanalyze_66356220.js90 KB72 KB (81%)✓3rd
https://www.google.com/cse/static/element/dc329f57de078f5d/cse_element__en.js?usqp=CAM%3D103 KB52 KB (51%)✓3rd
https://cse.google.com/adsense/search/async-ads.js44 KB32 KB (73%)✓3rd
https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js55 KB28 KB (51%)✓3rd
https://www.sjsu.edu/_resources/js/vendor/swiper-bundle.min.js39 KB23 KB (60%)✓3rd
https://sjsu.edu/aspis/js/vendor/jquery.js79 KB20 KB (26%)✗1st
https://sjsu.edu/aspis/js/vendor/direct-edit.js1 KB—✓1st
https://sjsu.edu/aspis/js/vendor/what-input.js3 KB—✓1st
https://www.sjsu.edu/_resources/js/vendor/sjsu-vimeo-playlist.js?v=1.24 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
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
49 images, 0 KB saveable
REVIEW
49 images, 0 KB saveable
Warning::
https://sjsu.edu/_images/sjsu-rankings/ranking-mon... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://sjsu.edu/_images/sjsu-rankings/ranking-usn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://sjsu.edu/_images/sjsu-homepage-hero/Concep... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://sjsu.edu/_images/sjsu-homepage-hero/umc-we... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://sjsu.edu/_images/sjsu-rankings/codesignal_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://sjsu.edu/_images/sjsu-homepage-hero/sjsu-1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://sjsu.edu/aspis/media/icons/ui/icon-angle-b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://sjsu.edu/aspis/media/icons/ui/icon-angle-b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://sjsu.edu/_images/sjsu-rankings/ranking-usn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://sjsu.edu/_images/news/wsq-entrepreneurship... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://sjsu.edu/_images/news/SJSU_Online_jgenshei... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://sjsu.edu/_images/sjsu-homepage-hero/sjsu_m... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://sjsu.edu/_images/news/adrienne_headshot-40... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://sjsu.edu/_images/news/2026-fortune-ranking... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://sjsu.edu/_images/news/spartan-comeback-may... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://sjsu.edu/_images/news/hj-story-feb92026-b.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://sjsu.edu/_images/news/featured_calendar_de... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://sjsu.edu/_images/sjsu-homepage-hero/admitt... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://sjsu.edu/_images/sjsu-rankings/ranking-wsj... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://sjsu.edu/aspis/media/icons/apps/icon-calst... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://sjsu.edu/aspis/media/brand/icon-spartan-wi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://sjsu.edu/aspis/media/brand/logo-sjsu.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
49 images 7.3 MB
0 oversized -0 KB
43 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
Page Weight Inventory
Action
101 resources · 8.3 MB · 315 KB savings available
REVIEW
101 resources · 8.3 MB · 315 KB savings available
Warning::
Page weight 7.3 MB over 1MB target
Got: 8.3 MB Expected: ≤ 1 MB
Info::
~315 KB of savings available
Info::
51 third-party resources (11% of weight)
Info::
6 resources over 200KB
101 resources · 8.3 MiB · 51 third-party 7.3 MiB over 1MB target
Image 88% · 7.3 MiB
JavaScript 9% · 776.2 KiB
Font 1% · 99.1 KiB
CSS 1% · 63.8 KiB
Document 0% · 29.2 KiB
Other 0% · 15.3 KiB

~314.6 KiB of savings available

Remove unused JavaScript: 314.6 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Third-Party Impact
11% third-party, 0 ms blocking
PASS
11% third-party, 0 ms blocking
Info::
Third-party code accounts for 11% of page weight (930.2 KiB of 8.3 MiB)
Info::
Third-party blocking time is low (0 ms)
89%
First-party Third-party
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
3 fonts (99 KB)
PASS
3 fonts (99 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

99 KB total

Render-blocking

0

of 3

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 9.0 s FCP 2.5 s LCP 9.5 shttps://sjsu.edu/aspis/fonts/SJSUSpartanRegular.woffSJSUSpartanRegular.woff https://sjsu.edu/aspis/fonts/SJSUSpartanRegular.woff — 35.1 KiB — 591 ms — font-display: swaphttps://fonts.gstatic.com/s/nunitosans/v19/pe0TMImSLYBIv1o4X1M8ce2xCx3yop4tQpF_MeTm0lfGWVpNn64CL7U8upHZIbMV51Q42ptCp7t1R-tQKr51.woff2pe0TMImSLYBIv1o4X1M8ce2... https://fonts.gstatic.com/s/nunitosans/v19/pe0TMImSLYBIv1o4X1M8ce2xCx3yop4tQpF_MeTm0lfGWVpNn64CL7U8upHZIbMV51Q42ptCp7t1R-tQKr51.woff2 — 30.3 KiB — 33 ms — font-display: swaphttps://sjsu.edu/aspis/fonts/SJSUSpartanBold.woffSJSUSpartanBold.woff https://sjsu.edu/aspis/fonts/SJSUSpartanBold.woff — 33.7 KiB — 589 ms — font-display: swap
SJSUSpartanRegular.woff woff swap
Size 35 KB
Load time 591 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
pe0TMImSLYBIv1o4X1M8ce2... woff2 swap
Size 30 KB
Load time 33 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
SJSUSpartanBold.woff woff swap
Size 34 KB
Load time 589 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~21 KB and ~42 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
101 requests over 16172ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 2.5 s LCP 9.5 shttps://sjsu.edu// https://sjsu.edu/ — 200 — 13.4 KiB — 504 ms — http/1.1https://sjsu.edu/aspis/css/foundation.css/aspis/css/foundation.css https://sjsu.edu/aspis/css/foundation.css — 200 — 20.7 KiB — 331 ms — http/1.1https://sjsu.edu/aspis/css/campus.css/aspis/css/campus.css https://sjsu.edu/aspis/css/campus.css — 200 — 17.3 KiB — 348 ms — http/1.1https://fonts.googleapis.com/css?family=Nunito+Sans:400,600,800fonts.googleapis.com/css?family=Nun... https://fonts.googleapis.com/css?family=Nunito+Sans:400,600,800 — 200 — 1.1 KiB — 97 ms — h2https://sjsu.edu/aspis/css/prototype.css/aspis/css/prototype.css https://sjsu.edu/aspis/css/prototype.css — 200 — 1.5 KiB — 478 ms — http/1.1https://sjsu.edu/aspis/media/brand/logo-we-are-spartans.svg/aspis/media/brand/logo-we-are-spar... https://sjsu.edu/aspis/media/brand/logo-we-are-spartans.svg — 200 — 5.6 KiB — 479 ms — http/1.1https://sjsu.edu/_images/sjsu-homepage-hero/sjsu-1857-min-of-giving-banner.jpg/_images/sjsu-homepage-hero/sjsu-18... https://sjsu.edu/_images/sjsu-homepage-hero/sjsu-1857-min-of-giving-banner.jpg — 200 — 3.9 MiB — 13.7 s — http/1.1https://sjsu.edu/_images/sjsu-homepage-hero/admitted-spartan-enroll-banner-2026-845x565.jpg/_images/sjsu-homepage-hero/admitte... https://sjsu.edu/_images/sjsu-homepage-hero/admitted-spartan-enroll-banner-2026-845x565.jpg — 200 — 45.6 KiB — 479 ms — http/1.1https://sjsu.edu/_images/sjsu-homepage-hero/umc-website_postcard-codesignal-ranking-2026.png/_images/sjsu-homepage-hero/umc-web... https://sjsu.edu/_images/sjsu-homepage-hero/umc-website_postcard-codesignal-ranking-2026.png — 200 — 787.5 KiB — 1.4 s — http/1.1https://sjsu.edu/_images/sjsu-rankings/ranking-money-transformative-university.png/_images/sjsu-rankings/ranking-mone... https://sjsu.edu/_images/sjsu-rankings/ranking-money-transformative-university.png — 200 — 43.5 KiB — 519 ms — 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KiB — 54 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
46% of JavaScript execution is third-party
First-party Third-party 1999ms · 499KB · $27/mo
Unattributable
Other
Costly
Execution 1007ms
Transfer 0 KB
Monthly Cost $13/mo
script.crazyegg.com
Other
Costly
Execution 290ms
Transfer 55 KB
Unused 51%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 276ms
Transfer 181 KB
Unused 48%
Monthly Cost $4/mo
www.google.com
Other
Optional
Execution 127ms
Transfer 103 KB
Unused 51%
Monthly Cost $2/mo
script.crazyegg.com
Other
Optional
Execution 81ms
Transfer 23 KB
Monthly Cost $1/mo
cse.google.com
Other
Optional
Execution 81ms
Transfer 44 KB
Unused 73%
Monthly Cost $1/mo
www.sjsu.edu
Other
Optional
Execution 70ms
Transfer 4 KB
Monthly Cost $1/mo
siteimproveanalytics.com
Other
Optional
Execution 68ms
Transfer 90 KB
Unused 81%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 1007ms and costs ~$13/month
  • script.crazyegg.com adds 290ms and costs ~$4/month
  • Google Tag Manager adds 276ms and costs ~$4/month

46% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 1007ms 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

script.crazyegg.com takes 290ms 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

51% of script.crazyegg.com'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

Google Tag Manager takes 276ms 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

51% of www.google.com'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

73% of cse.google.com'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 siteimproveanalytics.com'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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