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https://bartleby.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
92
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

624 ms

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

1.65 s

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

19 ms

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

0.014

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

1.38 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.

2.01 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
5 PASS 3 REVIEW 5 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 131 requests
FIX
2.2 MB transferred, 131 requests
Info::
Page weighs 7.2 MB (2.2 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
Info::
Fonts are 209 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 209 KB
Warning::
131 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.46 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
131 requests
0.46 g CO2 per page load
JavaScript 1.5 MiB 67%
Images 309.7 KiB 14%
Fonts 208.9 KiB 9%
HTML 153.1 KiB 7%
CSS 58.7 KiB 3%
Other 11.4 KiB 1%
Other 3.6 KiB 0%
Other 0 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

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 (2.2 MiB of 2.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
75 scripts, 892 KB unused
FIX
75 scripts, 892 KB unused
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.bartleby.com/static/tinymce-5.9.2/js/t...: 79 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 892 KB
892 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://www.bartleby.com/static/tinymce-5.9.2/js/tinymce/themes/silver/theme.min.js115 KB79 KB (69%)✓3rd
https://www.bartleby.com/static/tinymce-5.9.2/js/tinymce/tinymce.min.js126 KB75 KB (60%)✓3rd
https://www.bartleby.com/static/tinymce-5.9.2/js/tinymce/plugins/table/plugin.min.js41 KB30 KB (74%)✓3rd
https://www.bartleby.com/_next/static/chunks/23363-2bd221815c5493c3.js4 KB—✓3rd
https://www.bartleby.com/_next/static/chunks/80463.3b16df8e650cd80a.js9 KB—✓3rd
https://www.bartleby.com/_next/static/chunks/41664-200d5d631cd6c206.js3 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
131 resources · 2.2 MB · 892 KB savings available
FIX
131 resources · 2.2 MB · 892 KB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Info::
~892 KB of savings available
Warning::
129 third-party resources (100% of weight)
Info::
2 resources over 200KB
131 resources · 2.2 MiB · 129 third-party 1.2 MiB over 1MB target
JavaScript 67% · 1.5 MiB
Image 14% · 310.5 KiB
Font 9% · 208.9 KiB
Document 7% · 153.4 KiB
CSS 3% · 58.7 KiB
Other 0% · 3.6 KiB

~892.1 KiB of savings available

Remove unused JavaScript: 892.1 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
33 images, 0 KB saveable
REVIEW
33 images, 0 KB saveable
Info::
All images are well-optimized
33 images 310 KB
0 oversized -0 KB
28 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
961ms total JS execution
REVIEW
961ms total JS execution
Warning::
https://www.bartleby.com/_next/static/chunks/frame...: 265ms CPU time
Info::
Unattributable: 191ms CPU time
Info::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 161ms CPU time
Info::
https://www.bartleby.com/: 147ms CPU time
Info::
https://www.bartleby.com/static/tinymce-5.9.2/js/t...: 116ms CPU time
Warning::
Third-party scripts: 961ms (100% of total)

Main Thread Breakdown

Script Evaluation 60% Other 17% Style & Layout 9% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
https://www.bartleby.com/_next/static/chunks/framework-75746eeb80cbf23f.js265ms236ms4ms3rd
Unattributable191ms4ms0ms3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js161ms134ms22ms3rd
https://www.bartleby.com/147ms4ms0ms3rd
https://www.bartleby.com/static/tinymce-5.9.2/js/tinymce/tinymce.min.js116ms95ms9ms3rd
https://www.bartleby.com/_next/static/chunks/pages/index-096c205973f21c01.js82ms71ms8ms3rd
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 (209 KB)
PASS
7 fonts (209 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

209 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 FCP 624 ms LCP 1.6 shttps://fonts.gstatic.com/s/sourcesanspro/v14/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7l.woff26xK3dSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v14/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7l.woff2 — 15.8 KiB — 127 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v14/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v14/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu.woff2 — 15.6 KiB — 121 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v14/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v14/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu.woff2 — 15.4 KiB — 97 ms — font-display: swaphttps://fonts.gstatic.com/s/sourceserifpro/v11/neIVzD-0qpwxpaWvjeD0X88SAOeauXEGfS-axq0r.woff2neIVzD-0qpwxpaWvjeD0X88... https://fonts.gstatic.com/s/sourceserifpro/v11/neIVzD-0qpwxpaWvjeD0X88SAOeauXEGfS-axq0r.woff2 — 20.2 KiB — 135 ms — font-display: swaphttps://fonts.gstatic.com/s/materialicons/v103/flUhRq6tzZclQEJ-Vdg-IuiaDsNc.woff2flUhRq6tzZclQEJ-Vdg-Iui... https://fonts.gstatic.com/s/materialicons/v103/flUhRq6tzZclQEJ-Vdg-IuiaDsNc.woff2 — 108.0 KiB — 153 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 64 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 0 ms — font-display: swap
6xK3dSBYKcSV-LCoeQqfX1R... woff2 swap
Size 16 KB
Load time 127 ms
Start 210 ms
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 16 KB
Load time 121 ms
Start 211 ms
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 97 ms
Start 211 ms
Risk FOUT — text flashes from fallback to web font
neIVzD-0qpwxpaWvjeD0X88... woff2 swap
Size 20 KB
Load time 135 ms
Start 211 ms
Risk FOUT — text flashes from fallback to web font
flUhRq6tzZclQEJ-Vdg-Iui... woff2 swap
Size 108 KB
Load time 153 ms
Start 211 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
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 64 ms
Start 2.4 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 0 ms
Start 3.0 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 ~54 KB and ~108 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
Network Waterfall
131 requests over 4784ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 624 ms LCP 1.6 shttps://bartleby.com// https://bartleby.com/ — 301 — 306 B — 103 ms — h2https://www.bartleby.com/www.bartleby.com/ https://www.bartleby.com/ — 200 — 123.2 KiB — 101 ms — h2https://fonts.gstatic.com/s/sourcesanspro/v14/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7l.woff2fonts.gstatic.com/s/sourcesanspro/v... https://fonts.gstatic.com/s/sourcesanspro/v14/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7l.woff2 — 200 — 15.8 KiB — 127 ms — h3https://fonts.gstatic.com/s/sourcesanspro/v14/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu.woff2fonts.gstatic.com/s/sourcesanspro/v... https://fonts.gstatic.com/s/sourcesanspro/v14/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu.woff2 — 200 — 15.6 KiB — 121 ms — h3https://fonts.gstatic.com/s/sourcesanspro/v14/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu.woff2fonts.gstatic.com/s/sourcesanspro/v... https://fonts.gstatic.com/s/sourcesanspro/v14/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu.woff2 — 200 — 15.4 KiB — 97 ms — h3https://fonts.gstatic.com/s/sourceserifpro/v11/neIVzD-0qpwxpaWvjeD0X88SAOeauXEGfS-axq0r.woff2fonts.gstatic.com/s/sourceserifpro/... https://fonts.gstatic.com/s/sourceserifpro/v11/neIVzD-0qpwxpaWvjeD0X88SAOeauXEGfS-axq0r.woff2 — 200 — 20.2 KiB — 135 ms — h3https://fonts.gstatic.com/s/materialicons/v103/flUhRq6tzZclQEJ-Vdg-IuiaDsNc.woff2fonts.gstatic.com/s/materialicons/v... https://fonts.gstatic.com/s/materialicons/v103/flUhRq6tzZclQEJ-Vdg-IuiaDsNc.woff2 — 200 — 108.0 KiB — 153 ms — h3https://www.bartleby.com/static/homepage-v4/hero-1440.jpgwww.bartleby.com/static/homepage-v4... https://www.bartleby.com/static/homepage-v4/hero-1440.jpg — 200 — 87.8 KiB — 32 ms — h2https://www.bartleby.com/static/bartleby-logo-tm.svgwww.bartleby.com/static/bartleby-lo... https://www.bartleby.com/static/bartleby-logo-tm.svg — 200 — 3.1 KiB — 10 ms — h2https://www.bartleby.com/_next/static/chunks/9574.bfddcf0f7755f042.jswww.bartleby.com/_next/static/chunk... https://www.bartleby.com/_next/static/chunks/9574.bfddcf0f7755f042.js — 200 — 1.8 KiB — 12 ms — h2https://www.bartleby.com/_next/static/chunks/webpack-760d12deaa4c1cf4.jswww.bartleby.com/_next/static/chunk... https://www.bartleby.com/_next/static/chunks/webpack-760d12deaa4c1cf4.js — 200 — 11.0 KiB — 15 ms — h2https://www.bartleby.com/_next/static/chunks/framework-75746eeb80cbf23f.jswww.bartleby.com/_next/static/chunk... https://www.bartleby.com/_next/static/chunks/framework-75746eeb80cbf23f.js — 200 — 45.5 KiB — 27 ms — h2https://www.bartleby.com/_next/static/chunks/main-4552a5059bf1b940.jswww.bartleby.com/_next/static/chunk... https://www.bartleby.com/_next/static/chunks/main-4552a5059bf1b940.js — 200 — 27.5 KiB — 26 ms — h2https://assets.bartleby.com/1.17/js/scripts.1.17.123.min.jsassets.bartleby.com/1.17/js/scripts... https://assets.bartleby.com/1.17/js/scripts.1.17.123.min.js — 200 — 3.1 KiB — 24 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 83 ms — h2https://www.bartleby.com/_next/static/chunks/pages/_app-0fbc7ad5b16ddb72.jswww.bartleby.com/_next/static/chunk... https://www.bartleby.com/_next/static/chunks/pages/_app-0fbc7ad5b16ddb72.js — 200 — 20.1 KiB — 10 ms — h2https://www.bartleby.com/_next/static/chunks/82562-b4f2d973668387bc.jswww.bartleby.com/_next/static/chunk... https://www.bartleby.com/_next/static/chunks/82562-b4f2d973668387bc.js — 200 — 8.7 KiB — 11 ms — h2https://www.bartleby.com/_next/static/chunks/85287-9ea00c9d19e82f90.jswww.bartleby.com/_next/static/chunk... https://www.bartleby.com/_next/static/chunks/85287-9ea00c9d19e82f90.js — 200 — 14.3 KiB — 18 ms — h2https://www.bartleby.com/_next/static/chunks/41664-200d5d631cd6c206.jswww.bartleby.com/_next/static/chunk... https://www.bartleby.com/_next/static/chunks/41664-200d5d631cd6c206.js — 200 — 3.2 KiB — 21 ms — h2https://www.bartleby.com/_next/static/chunks/21876-564f257da4f42e46.jswww.bartleby.com/_next/static/chunk... https://www.bartleby.com/_next/static/chunks/21876-564f257da4f42e46.js — 200 — 8.2 KiB — 21 ms — h2https://www.bartleby.com/_next/static/chunks/91036-5679ee51e38705e2.jswww.bartleby.com/_next/static/chunk... https://www.bartleby.com/_next/static/chunks/91036-5679ee51e38705e2.js — 200 — 63.6 KiB — 20 ms — h2https://www.bartleby.com/_next/static/chunks/37831-7bddb68150671f8f.jswww.bartleby.com/_next/static/chunk... https://www.bartleby.com/_next/static/chunks/37831-7bddb68150671f8f.js — 200 — 4.5 KiB — 17 ms — h2https://wurfl.io/wurfl.jswurfl.io/wurfl.js https://wurfl.io/wurfl.js — 200 — 2.5 KiB — 181 ms — http/1.1https://www.bartleby.com/_next/static/chunks/33681-6fb492a4ff3c0afd.jswww.bartleby.com/_next/static/chunk... https://www.bartleby.com/_next/static/chunks/33681-6fb492a4ff3c0afd.js — 200 — 4.5 KiB — 13 ms — h2https://www.bartleby.com/_next/static/chunks/90101-f0ebf27d2c402ce5.jswww.bartleby.com/_next/static/chunk... https://www.bartleby.com/_next/static/chunks/90101-f0ebf27d2c402ce5.js — 200 — 7.9 KiB — 8 ms — h2https://www.bartleby.com/_next/static/chunks/98588-ada148b233a2642a.jswww.bartleby.com/_next/static/chunk... https://www.bartleby.com/_next/static/chunks/98588-ada148b233a2642a.js — 200 — 5.7 KiB — 8 ms — h2https://www.bartleby.com/_next/static/chunks/84379-079906211c641de6.jswww.bartleby.com/_next/static/chunk... https://www.bartleby.com/_next/static/chunks/84379-079906211c641de6.js — 200 — 17.1 KiB — 15 ms — h2https://www.bartleby.com/_next/static/chunks/23363-2bd221815c5493c3.jswww.bartleby.com/_next/static/chunk... https://www.bartleby.com/_next/static/chunks/23363-2bd221815c5493c3.js — 200 — 4.2 KiB — 8 ms — h2https://www.bartleby.com/_next/static/chunks/33243-906580604ea032a3.jswww.bartleby.com/_next/static/chunk... 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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
100% of JavaScript execution is third-party
First-party Third-party 961ms · 313KB · $13/mo
www.bartleby.com
Other
Costly
Execution 265ms
Transfer 46 KB
Monthly Cost $4/mo
Unattributable
Other
Optional
Execution 191ms
Transfer 0 KB
Monthly Cost $3/mo
www.gstatic.com
Other
Optional
Execution 161ms
Transfer 0 KB
Unused 49%
Monthly Cost $2/mo
www.bartleby.com
Other
Optional
Execution 147ms
Transfer 123 KB
Monthly Cost $2/mo
www.bartleby.com
Other
Optional
Execution 116ms
Transfer 126 KB
Unused 60%
Monthly Cost $2/mo
www.bartleby.com
Other
Optional
Execution 82ms
Transfer 18 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.bartleby.com adds 265ms 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.bartleby.com takes 265ms 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

60% of www.bartleby.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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