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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
5
REVIEW
1
PASS
9
INFO
2

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

Mobile Desktop
25
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
69
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
91
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.

18.17 s

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

29.90 s

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

5.00 s

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.

18.17 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.

34.44 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
9 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
4.9 MB transferred, 71 requests
FIX
4.9 MB transferred, 71 requests
Critical::
Page weighs 16.5 MB (4.9 MB transferred)
Warning::
JavaScript is 3.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 3.3 MB
Info::
Fonts are 797 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 797 KB
Info::
71 HTTP requests
Info::
Estimated 1.0 g CO2 per page load
4.9 MB / 2.4 MB budget
4.9 MB transferred
71 requests
1.0 g CO2 per page load
JavaScript 3.3 MiB 68%
Fonts 796.7 KiB 16%
Other 622.1 KiB 13%
CSS 100.8 KiB 2%
HTML 54.1 KiB 1%
Other 9.3 KiB 0%
Images 2.2 KiB 0%
Other 990 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

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

D
Third-Party Impact
Action
87% third-party, 0 ms blocking
FIX
87% third-party, 0 ms blocking
Warning::
Third-party code accounts for 87% of page weight (4.2 MiB of 4.9 MiB)
Info::
Third-party blocking time is low (0 ms)
87%
First-party Third-party
F
JS Execution Cost
Action
11610ms total JS execution
FIX
11610ms total JS execution
Warning::
https://ssl.gstatic.com/colaboratory-static/common...: 3093ms CPU time
Warning::
https://www.gstatic.com/recaptcha/releases/zFuF-tb...: 2190ms CPU time
Warning::
https://ssl.gstatic.com/colaboratory-static/common...: 2025ms CPU time
Warning::
https://colab.research.google.com/: 1131ms CPU time
Warning::
Unattributable: 824ms CPU time
Warning::
Third-party scripts: 9744ms (84% of total)

Main Thread Breakdown

Script Evaluation 59% Script Parsing & Compilation 16% Style & Layout 11% Other 9%
ScriptTotalScriptingParse/CompileParty
https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/js%2Fmonaco_editor%2F/vs/editor/editor.main.nls.js3093ms2618ms11ms3rd
https://www.gstatic.com/recaptcha/releases/zFuF-tbndD6YrdyXHX3EVT0n/recaptcha__en.js2190ms1530ms514ms3rd
https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/external_binary.js2025ms1202ms760ms3rd
https://colab.research.google.com/1131ms40ms22ms1st
Unattributable824ms151ms0ms3rd
https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/js%2Fmonaco_editor%2F/vs/editor/editor.main.js697ms238ms427ms3rd
https://colab.research.google.com/_/bscframe314ms90ms0ms1st
https://www.googletagmanager.com/gtag/js?id=G-S3V05QCXK5&cx=c&_slc=1260ms202ms54ms3rd
https://colab.research.google.com/static/mathjax/jax/output/HTML-CSS/fonts/TeX/fontdata.js?V=2.7.5253ms49ms5ms1st
https://www.google.com/js/bg/EXhBhUaAPGW-fRpAMA-c23Y5TFEBiEfCQpe1mRG-KHM.js194ms181ms8ms3rd

Showing top 10 of 15 scripts

F
JS Bundles
Action
27 scripts, 2.3 MB unused
FIX
27 scripts, 2.3 MB unused
Warning::
https://ssl.gstatic.com/colaboratory-static/common...: 914 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ssl.gstatic.com/colaboratory-static/common...: 603 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/zFuF-tb...: 176 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/zFuF-tb...: 176 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/zFuF-tb...: 176 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 2.3 MB
2335 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/external_binary.js1569 KB914 KB (58%)✓3rd
https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/js%2Fmonaco_editor%2F/vs/editor/editor.main.js837 KB603 KB (72%)✓3rd
https://www.gstatic.com/recaptcha/releases/zFuF-tbndD6YrdyXHX3EVT0n/recaptcha__en.js0 KB176 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/zFuF-tbndD6YrdyXHX3EVT0n/recaptcha__en.js0 KB176 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/zFuF-tbndD6YrdyXHX3EVT0n/recaptcha__en.js362 KB176 KB (49%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-S3V05QCXK5&cx=c&_slc=1148 KB64 KB (43%)✓3rd
https://colab.research.google.com/static/mathjax/config/TeX-AMS_HTML-full.js?V=2.7.589 KB58 KB (65%)✓1st
https://www.gstatic.com/og/_/js/k=og.qtm.en_US.Z6E9e-jZ3gE.2019.O/rt=j/m=qabr,q_dnp,qcwid,qapid,qads,q_dg/exm=qaaw,qadd,qaid,qein,qhaw,qhba,qhbr,qhch,qhga,qhid,qhin/d=1/ed=1/rs=AA2YrTtnYMWhnj_5JFE_4rY8kYjgFBEDSA84 KB58 KB (69%)✓3rd
https://apis.google.com/_/scs/abc-static/_/js/k=gapi.gapi.en.5G9F9JPGjf8.O/m=client/exm=gapi_iframes,googleapis_client/rt=j/sv=1/d=1/ed=1/rs=AHpOoo-OYuAVGK84U6cg5lkjGc85qYpeMw/cb=gapi.loaded_171 KB56 KB (80%)✓3rd
https://www.gstatic.com/feedback/js/help/prod/service/lazy.min.js39 KB30 KB (77%)✓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
71 resources · 4.9 MB · 2.3 MB savings available
FIX
71 resources · 4.9 MB · 2.3 MB savings available
Warning::
Page weight 3.9 MB over 1MB target
Got: 4.9 MB Expected: ≤ 1 MB
Info::
~2.3 MB of savings available
Warning::
56 third-party resources (87% of weight)
Info::
5 resources over 200KB
71 resources · 4.9 MiB · 56 third-party 3.9 MiB over 1MB target
JavaScript 71% · 3.5 MiB
Font 16% · 796.7 KiB
Other 9% · 433.3 KiB
CSS 2% · 103.0 KiB
Document 2% · 74.8 KiB
Image 0% · 11.5 KiB

~2.3 MiB of savings available

Remove unused JavaScript: 2.3 MiB
B
HTTP Caching
no-cache, must-revalidate
REVIEW
no-cache, must-revalidate
Info::
Cache-Control header is set
Got: no-cache, must-revalidate
Info::
ETag present — enables conditional (304) responses
Cache-Control

no-cache, must-revalidate

DirectiveValueMeaning
no-cache—Cache but always revalidate first
must-revalidate—Must recheck with server after expiry
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
Image Optimization
5 images, 0 KB saveable
PASS
5 images, 0 KB saveable
Warning::
data:image/webp;base64,UklGRuAWAABXRUJQVlA4TNMWAAA... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
5 images 2 KB
0 oversized -0 KB
2 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

A+
Font Loading
12 fonts (797 KB)
PASS
12 fonts (797 KB)
Info::
12 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

12

797 KB total

Render-blocking

0

of 12

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 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s FCP 18.2 s LCP 29.9 shttps://fonts.gstatic.com/s/googlesanstext/v25/5aUu9-KzpRiLCAt4Unrc-xIKmCU5qEp2i0VBuxM.woff25aUu9-KzpRiLCAt4Unrc-xI... https://fonts.gstatic.com/s/googlesanstext/v25/5aUu9-KzpRiLCAt4Unrc-xIKmCU5qEp2i0VBuxM.woff2 — 21.6 KiB — 15 ms — font-display: swaphttps://fonts.gstatic.com/s/googlesymbols/v419/HhzZU5Ak9u-oMExPeInvcuEmPosC9zS3FYkFU68cPrjdKM1XMoDZlWmzc3IiWvF1SbxVhQidBnv_C_ar1J9g0sLBUv3G8taXmBpH-Bw.woff2HhzZU5Ak9u-oMExPeInvcuE... https://fonts.gstatic.com/s/googlesymbols/v419/HhzZU5Ak9u-oMExPeInvcuEmPosC9zS3FYkFU68cPrjdKM1XMoDZlWmzc3IiWvF1SbxVhQidBnv_C_ar1J9g0sLBUv3G8taXmBpH-Bw.woff2 — 534.3 KiB — 47 ms — font-display: swaphttps://colab.research.google.com/static/mathjax/fonts/HTML-CSS/TeX/woff/MathJax_Main-Regular.woff?V=2.7.5MathJax_Main-Regular.woff https://colab.research.google.com/static/mathjax/fonts/HTML-CSS/TeX/woff/MathJax_Main-Regular.woff?V=2.7.5 — 33.4 KiB — 64 ms — font-display: swaphttps://colab.research.google.com/static/mathjax/fonts/HTML-CSS/TeX/woff/MathJax_Math-Italic.woff?V=2.7.5MathJax_Math-Italic.woff https://colab.research.google.com/static/mathjax/fonts/HTML-CSS/TeX/woff/MathJax_Math-Italic.woff?V=2.7.5 — 18.9 KiB — 179 ms — font-display: swaphttps://colab.research.google.com/static/mathjax/fonts/HTML-CSS/TeX/woff/MathJax_Size1-Regular.woff?V=2.7.5MathJax_Size1-Regular.woff https://colab.research.google.com/static/mathjax/fonts/HTML-CSS/TeX/woff/MathJax_Size1-Regular.woff?V=2.7.5 — 5.7 KiB — 174 ms — font-display: swaphttps://fonts.gstatic.com/s/googlesans/v67/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iqcsih3SAyH6cAwhX9RPjIUvbQoi-E.woff24UasrENHsxJlGDuGo1OIlJf... https://fonts.gstatic.com/s/googlesans/v67/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iqcsih3SAyH6cAwhX9RPjIUvbQoi-E.woff2 — 35.3 KiB — 15 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 11 ms — font-display: swaphttps://fonts.gstatic.com/s/googlesanstext/v25/5aUp9-KzpRiLCAt4Unrc-xIKmCU5oLlVnmhjtjm4DZw.woff25aUp9-KzpRiLCAt4Unrc-xI... https://fonts.gstatic.com/s/googlesanstext/v25/5aUp9-KzpRiLCAt4Unrc-xIKmCU5oLlVnmhjtjm4DZw.woff2 — 22.8 KiB — 10 ms — font-display: swaphttps://fonts.gstatic.com/s/googlesanstext/v25/5aUp9-KzpRiLCAt4Unrc-xIKmCU5oPFTnmhjtjm4DZw.woff25aUp9-KzpRiLCAt4Unrc-xI... https://fonts.gstatic.com/s/googlesanstext/v25/5aUp9-KzpRiLCAt4Unrc-xIKmCU5oPFTnmhjtjm4DZw.woff2 — 22.3 KiB — 17 ms — font-display: swaphttps://fonts.gstatic.com/s/googlesanstext/v25/5aUu9-KzpRiLCAt4Unrc-xIKmCU5qCR2i0VBuxOCBA.woff25aUu9-KzpRiLCAt4Unrc-xI... https://fonts.gstatic.com/s/googlesanstext/v25/5aUu9-KzpRiLCAt4Unrc-xIKmCU5qCR2i0VBuxOCBA.woff2 — 12.0 KiB — 18 ms — font-display: swaphttps://fonts.gstatic.com/s/googlesans/v67/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iqcsih3SAyH6cAwhX9RPlwUvbQoi-Entw.woff24UasrENHsxJlGDuGo1OIlJf... https://fonts.gstatic.com/s/googlesans/v67/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iqcsih3SAyH6cAwhX9RPlwUvbQoi-Entw.woff2 — 19.8 KiB — 16 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 5 ms — font-display: swap
5aUu9-KzpRiLCAt4Unrc-xI... woff2 swap
Size 22 KB
Load time 15 ms
Start 880 ms
Risk FOUT — text flashes from fallback to web font
HhzZU5Ak9u-oMExPeInvcuE... woff2 swap
Size 534 KB
Load time 47 ms
Start 880 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
MathJax_Main-Regular.woff woff swap
Size 33 KB
Load time 64 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
MathJax_Math-Italic.woff woff swap
Size 19 KB
Load time 179 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
MathJax_Size1-Regular.woff woff swap
Size 6 KB
Load time 174 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
4UasrENHsxJlGDuGo1OIlJf... woff2 swap
Size 35 KB
Load time 15 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 11 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
5aUp9-KzpRiLCAt4Unrc-xI... woff2 swap
Size 23 KB
Load time 10 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
5aUp9-KzpRiLCAt4Unrc-xI... woff2 swap
Size 22 KB
Load time 17 ms
Start 2.2 s
Risk FOUT — text flashes from fallback to web font
5aUu9-KzpRiLCAt4Unrc-xI... woff2 swap
Size 12 KB
Load time 18 ms
Start 2.2 s
Risk FOUT — text flashes from fallback to web font
4UasrENHsxJlGDuGo1OIlJf... woff2 swap
Size 20 KB
Load time 16 ms
Start 2.3 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 5 ms
Start 2.9 s
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 ~285 KB and ~570 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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Google Cloud

Network Waterfall
71 requests over 3146ms
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 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s FCP 18.2 s LCP 29.9 shttps://colab.research.google.com// https://colab.research.google.com/ — 200 — 24.8 KiB — 70 ms — h2https://fonts.googleapis.com/css2?family=Google+Symbols:FILL@0..1&display=blockfonts.googleapis.com/css2?family=Go... https://fonts.googleapis.com/css2?family=Google+Symbols:FILL@0..1&display=block — 200 — 919 B — 51 ms — h2https://fonts.googleapis.com/css?family=Roboto:300,400,500,600,700|Google+Sans:300,400,500,600,700|Google+Sans+Text:400,500,700&display=blockfonts.googleapis.com/css?family=Rob... https://fonts.googleapis.com/css?family=Roboto:300,400,500,600,700|Google+Sans:300,400,500,600,700|Google+Sans+Text:400,500,700&display=block — 200 — 4.1 KiB — 52 ms — h2https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/v2/external/bundle.cssssl.gstatic.com/colaboratory-static... https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/v2/external/bundle.css — 200 — 35.8 KiB — 40 ms — h2https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/gapi_loader.jsssl.gstatic.com/colaboratory-static... https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/gapi_loader.js — 200 — 7.1 KiB — 34 ms — h2https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/socketio_binary.jsssl.gstatic.com/colaboratory-static... https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/socketio_binary.js — 200 — 21.5 KiB — 40 ms — h2https://colab.research.google.com/static/mathjax/MathJax.js?config=TeX-AMS_HTML-full,Safe&delayStartupUntil=configured/static/mathjax/MathJax.js?config=T... https://colab.research.google.com/static/mathjax/MathJax.js?config=TeX-AMS_HTML-full,Safe&delayStartupUntil=configured — 200 — 19.0 KiB — 57 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
84% of JavaScript execution is third-party
First-party Third-party 9744ms · 2750KB · $129/mo
ssl.gstatic.com
Other
Costly
Execution 3093ms
Transfer 20 KB
Monthly Cost $41/mo
www.gstatic.com
Other
Costly
Execution 2190ms
Transfer 0 KB
Unused 49%
Monthly Cost $29/mo
ssl.gstatic.com
Other
Costly
Execution 2025ms
Transfer 1569 KB
Unused 58%
Monthly Cost $27/mo
Unattributable
Other
Costly
Execution 824ms
Transfer 0 KB
Monthly Cost $11/mo
ssl.gstatic.com
Other
Costly
Execution 697ms
Transfer 837 KB
Unused 72%
Monthly Cost $9/mo
Google Tag Manager
Tag Manager
Costly
Execution 260ms
Transfer 148 KB
Unused 43%
Monthly Cost $3/mo
www.google.com
Other
Optional
Execution 194ms
Transfer 24 KB
Monthly Cost $3/mo
www.google.com
Other
Optional
Execution 175ms
Transfer 28 KB
Monthly Cost $2/mo
www.gstatic.com
Other
Optional
Execution 175ms
Transfer 84 KB
Unused 69%
Monthly Cost $2/mo
apis.google.com
Other
Optional
Execution 109ms
Transfer 39 KB
Unused 63%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • ssl.gstatic.com adds 3093ms and costs ~$41/month
  • www.gstatic.com adds 2190ms and costs ~$29/month
  • ssl.gstatic.com adds 2025ms and costs ~$27/month
  • Unattributable adds 824ms and costs ~$11/month
  • ssl.gstatic.com adds 697ms and costs ~$9/month
  • Google Tag Manager adds 260ms and costs ~$3/month

84% 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

ssl.gstatic.com takes 3093ms 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.gstatic.com takes 2190ms 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

ssl.gstatic.com takes 2025ms 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

58% of ssl.gstatic.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

Unattributable takes 824ms 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

ssl.gstatic.com takes 697ms 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

72% of ssl.gstatic.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 260ms 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

69% of www.gstatic.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

63% of apis.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

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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