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https://bartleby.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
55
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
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.

2.32 s

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

12.29 s

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

611 ms

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

0.000

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

3.89 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.

12.68 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
8 PASS 2 REVIEW 5 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 118 requests
FIX
2.2 MB transferred, 118 requests
Info::
Page weighs 3.6 MB (2.2 MB transferred)
Warning::
Images are 1.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.5 MB
Warning::
118 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.47 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
118 requests
0.47 g CO2 per page load
Images 1.5 MiB 67%
JavaScript 451.3 KiB 20%
Fonts 175.0 KiB 8%
HTML 123.2 KiB 5%
Other 11.4 KiB 0%
Other 1.3 KiB 0%
0 2.4 MB 4.9 MB
Approaching limit

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

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
D
JS Execution Cost
Action
2391ms total JS execution
FIX
2391ms total JS execution
Warning::
https://www.bartleby.com/_next/static/chunks/frame...: 946ms CPU time
Warning::
Unattributable: 624ms CPU time
Warning::
https://www.bartleby.com/: 367ms CPU time
Warning::
https://www.bartleby.com/_next/static/chunks/pages...: 266ms CPU time
Info::
https://www.bartleby.com/_next/static/chunks/28666...: 73ms CPU time
Warning::
Third-party scripts: 2391ms (100% of total)

Main Thread Breakdown

Script Evaluation 51% Other 24% Style & Layout 13% Script Parsing & Compilation 6% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.bartleby.com/_next/static/chunks/framework-75746eeb80cbf23f.js946ms780ms21ms3rd
Unattributable624ms8ms0ms3rd
https://www.bartleby.com/367ms13ms0ms3rd
https://www.bartleby.com/_next/static/chunks/pages/index-096c205973f21c01.js266ms254ms9ms3rd
https://www.bartleby.com/_next/static/chunks/28666.47f68c2cca5ef7ea.js73ms70ms0ms3rd
https://www.bartleby.com/_next/static/chunks/90458.dae1585017fcd1ee.js59ms30ms2ms3rd
https://www.bartleby.com/_next/static/chunks/main-4552a5059bf1b940.js57ms46ms10ms3rd
D
Page Weight Inventory
Action
118 resources · 2.2 MB · 34 KB savings available
FIX
118 resources · 2.2 MB · 34 KB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Warning::
116 third-party resources (100% of weight)
118 resources · 2.2 MiB · 116 third-party 1.2 MiB over 1MB target
Image 67% · 1.5 MiB
JavaScript 20% · 461.5 KiB
Font 8% · 175.0 KiB
Document 5% · 123.5 KiB
Other 0% · 1.3 KiB

~33.9 KiB of savings available

Remove unused JavaScript: 33.9 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
55 images, 0 KB saveable
REVIEW
55 images, 0 KB saveable
Info::
All images are well-optimized
55 images 1.5 MB
0 oversized -0 KB
54 legacy format
0 missing dimensions CLS risk
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
5 fonts (175 KB)
PASS
5 fonts (175 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

175 KB total

Render-blocking

0

of 5

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 FCP 2.3 s LCP 12.3 shttps://fonts.gstatic.com/s/sourcesanspro/v14/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7l.woff26xK3dSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v14/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7l.woff2 — 15.8 KiB — 131 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 — 105 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 — 121 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 — 130 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 — 151 ms — font-display: swap
6xK3dSBYKcSV-LCoeQqfX1R... woff2 swap
Size 16 KB
Load time 131 ms
Start 223 ms
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 16 KB
Load time 105 ms
Start 223 ms
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 121 ms
Start 223 ms
Risk FOUT — text flashes from fallback to web font
neIVzD-0qpwxpaWvjeD0X88... woff2 swap
Size 20 KB
Load time 130 ms
Start 223 ms
Risk FOUT — text flashes from fallback to web font
flUhRq6tzZclQEJ-Vdg-Iui... woff2 swap
Size 108 KB
Load time 151 ms
Start 223 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
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+
JS Bundles
51 scripts, 34 KB unused
PASS
51 scripts, 34 KB unused
Warning::
https://www.bartleby.com/_next/static/chunks/91036...: 34 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 34 KB
34 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.bartleby.com/_next/static/chunks/91036-5679ee51e38705e2.js64 KB34 KB (58%)✓3rd
https://www.bartleby.com/_next/static/chunks/9574.bfddcf0f7755f042.js2 KB—✓3rd
https://www.bartleby.com/_next/static/chunks/webpack-760d12deaa4c1cf4.js11 KB—✓3rd
https://www.bartleby.com/_next/static/chunks/framework-75746eeb80cbf23f.js46 KB—✓3rd
https://www.bartleby.com/_next/static/chunks/main-4552a5059bf1b940.js28 KB—✓3rd
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js9 KB—✓3rd
https://assets.bartleby.com/1.17/js/scripts.1.17.123.min.js3 KB—✓3rd
https://www.bartleby.com/_next/static/chunks/pages/_app-0fbc7ad5b16ddb72.js20 KB—✓3rd
https://www.bartleby.com/_next/static/chunks/82562-b4f2d973668387bc.js9 KB—✓3rd
https://www.bartleby.com/_next/static/chunks/85287-9ea00c9d19e82f90.js14 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

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
118 requests over 1330ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 2.3 s LCP 12.3 shttps://bartleby.com// https://bartleby.com/ — 301 — 306 B — 111 ms — h2https://www.bartleby.com/www.bartleby.com/ https://www.bartleby.com/ — 200 — 123.2 KiB — 105 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 — 131 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 — 105 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 — 121 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 — 130 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 — 151 ms — h3https://www.bartleby.com/static/homepage-v4/hero-576.jpgwww.bartleby.com/static/homepage-v4... https://www.bartleby.com/static/homepage-v4/hero-576.jpg — 200 — 25.1 KiB — 21 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 — 16 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 — 14 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 — 19 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 — 22 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 — 21 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 105 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 — 91 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 — 11 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 — 9 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 — 17 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 — 17 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 — 18 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 — 25 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 — 18 ms — h2https://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 — 16 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 — 12 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 — 13 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 — 16 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 — 15 ms — h2https://www.bartleby.com/_next/static/chunks/33243-906580604ea032a3.jswww.bartleby.com/_next/static/chunk... https://www.bartleby.com/_next/static/chunks/33243-906580604ea032a3.js — 200 — 15.2 KiB — 13 ms — h2https://www.bartleby.com/_next/static/chunks/65228-e3d809fbbc996e89.jswww.bartleby.com/_next/static/chunk... https://www.bartleby.com/_next/static/chunks/65228-e3d809fbbc996e89.js — 200 — 4.2 KiB — 7 ms — h2https://www.bartleby.com/_next/static/chunks/43439-39ff2e778a079b0a.jswww.bartleby.com/_next/static/chunk... https://www.bartleby.com/_next/static/chunks/43439-39ff2e778a079b0a.js — 200 — 12.3 KiB — 14 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 2.3 s LCP 12.3 shttps://bartleby.com// https://bartleby.com/ — 301 — 306 B — 111 ms — h2https://www.bartleby.com/www.bartleby.com/ https://www.bartleby.com/ — 200 — 123.2 KiB — 105 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 — 131 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 — 105 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 — 121 ms — 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h2https://www.bartleby.com/static/social/footer-twitter-icon-white.svgwww.bartleby.com/static/social/foot... https://www.bartleby.com/static/social/footer-twitter-icon-white.svg — 200 — 1.1 KiB — 20 ms — h2https://www.bartleby.com/static/social/footer-instagram-icon-white.svgwww.bartleby.com/static/social/foot... https://www.bartleby.com/static/social/footer-instagram-icon-white.svg — 200 — 1.7 KiB — 19 ms — h2https://www.bartleby.com/static/social/footer-youtube-icon-white.svgwww.bartleby.com/static/social/foot... https://www.bartleby.com/static/social/footer-youtube-icon-white.svg — 200 — 1.0 KiB — 8 ms — h2https://www.bartleby.com/static/apple-store-badge.svgwww.bartleby.com/static/apple-store... https://www.bartleby.com/static/apple-store-badge.svg — 200 — 4.3 KiB — 10 ms — h2https://www.bartleby.com/static/third-party/google-play-badge-new.pngwww.bartleby.com/static/third-party... https://www.bartleby.com/static/third-party/google-play-badge-new.png — 200 — 4.3 KiB — 14 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
100% of JavaScript execution is third-party
First-party Third-party 2391ms · 226KB · $32/mo
www.bartleby.com
Other
Costly
Execution 946ms
Transfer 46 KB
Monthly Cost $13/mo
Unattributable
Other
Costly
Execution 624ms
Transfer 0 KB
Monthly Cost $8/mo
www.bartleby.com
Other
Costly
Execution 367ms
Transfer 123 KB
Monthly Cost $5/mo
www.bartleby.com
Other
Costly
Execution 266ms
Transfer 18 KB
Monthly Cost $4/mo
www.bartleby.com
Other
Optional
Execution 73ms
Transfer 2 KB
Monthly Cost $1/mo
www.bartleby.com
Other
Optional
Execution 59ms
Transfer 9 KB
Monthly Cost $1/mo
www.bartleby.com
Other
Optional
Execution 57ms
Transfer 28 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.bartleby.com adds 946ms and costs ~$13/month
  • Unattributable adds 624ms and costs ~$8/month
  • www.bartleby.com adds 367ms and costs ~$5/month
  • www.bartleby.com adds 266ms 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 946ms 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 624ms 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.bartleby.com takes 367ms 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.bartleby.com takes 266ms 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

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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