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https://indiebound.org

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
57
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.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
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.

4.22 s

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

14.57 s

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

239 ms

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

0.056

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

5.61 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.

14.57 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
F
Page Weight Budget
Action
3.0 MB transferred, 57 requests
FIX
3.0 MB transferred, 57 requests
Warning::
Page weighs 5.5 MB (3.0 MB transferred)
Warning::
Images are 1.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.8 MB
Warning::
JavaScript is 641 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 641 KB
Info::
Fonts are 380 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 380 KB
Info::
57 HTTP requests
Info::
Estimated 0.64 g CO2 per page load
3.0 MB / 2.4 MB budget
3.0 MB transferred
57 requests
0.64 g CO2 per page load
Images 1.8 MiB 60%
JavaScript 641.0 KiB 21%
Fonts 379.9 KiB 12%
CSS 115.1 KiB 4%
Other 63.3 KiB 2%
HTML 49.0 KiB 2%
Other 2.0 KiB 0%
Other 551 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

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
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (3.0 MiB of 3.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
13 scripts, 341 KB unused
FIX
13 scripts, 341 KB unused
Warning::
https://www.indiebound.org/sites/default/files/js/...: 87 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.curator.io/5.0/curator.embed.js: 74 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-582...: 63 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-NDW7...: 63 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/en_US/bundle/sdk.js/: 55 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 341 KB
341 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.indiebound.org/sites/default/files/js/js_BSv5lvt06hnnLveaEW3t_o6zVbrUvSWN9ZM8LPpry5g.js?scope=header&delta=0&language=en&theme=gavias_kunco&include=eJxtyFEKgDAIANALLTySmIjITAduwW5f39HXgycLObObvFzDjYIF5Ceb0m1U2Fdwgnqe5EfN7RbaNFNdkIJ8T-OCbzxZeCkq126 KB87 KB (69%)✓3rd
https://cdn.curator.io/5.0/curator.embed.js103 KB74 KB (72%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-5829836-1125 KB63 KB (51%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-NDW7XMP2RH&cx=c&gtm=4e64k1146 KB63 KB (43%)✓3rd
https://connect.facebook.net/en_US/bundle/sdk.js/78 KB55 KB (70%)✓3rd
https://www.indiebound.org/sites/default/files/js/js_4m8-Ps0LwjkREBxNlH-9cuudCZLcygsBzWsnBa52GTg.js?scope=footer&delta=0&language=en&theme=gavias_kunco&include=eJxtyFEKgDAIANALLTySmIjITAduwW5f39HXgycLObObvFzDjYIF5Ceb0m1U2Fdwgnqe5EfN7RbaNFNdkIJ8T-OCbzxZeCkq7 KB—✓3rd
https://cdn.curator.io/published/68f39721-20e6-4b52-a06a-87b8086fe285.js1 KB—✓3rd
https://www.google-analytics.com/analytics.js21 KB—✓3rd
https://connect.facebook.net/en_US/sdk.js5 KB—✓3rd
https://bookshop.org/widgets.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

D
Page Weight Inventory
Action
57 resources · 3.0 MB · 341 KB savings available
FIX
57 resources · 3.0 MB · 341 KB savings available
Warning::
Page weight 2.0 MB over 1MB target
Got: 3.0 MB Expected: ≤ 1 MB
Info::
~341 KB of savings available
Warning::
56 third-party resources (100% of weight)
Info::
4 resources over 200KB
57 resources · 3.0 MiB · 56 third-party 2.0 MiB over 1MB target
Image 62% · 1.9 MiB
JavaScript 21% · 641.0 KiB
Font 12% · 379.9 KiB
CSS 4% · 115.1 KiB
Document 2% · 49.4 KiB
Other 0% · 3.0 KiB

~341.2 KiB of savings available

Remove unused JavaScript: 341.2 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
15 images, 0 KB saveable
REVIEW
15 images, 0 KB saveable
Warning::
https://www.indiebound.org/sites/default/files/inl... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.indiebound.org/sites/default/files/inl... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.indiebound.org/sites/default/files/IB-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
15 images 1.8 MB
0 oversized -0 KB
13 legacy format
3 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

C
JS Execution Cost
Action
1826ms total JS execution
REVIEW
1826ms total JS execution
Warning::
https://www.indiebound.org/sites/default/files/js/...: 501ms CPU time
Warning::
https://www.indiebound.org/: 429ms CPU time
Warning::
Unattributable: 385ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=UA-582...: 162ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-NDW7...: 157ms CPU time
Warning::
Third-party scripts: 1826ms (100% of total)

Main Thread Breakdown

Script Evaluation 37% Other 26% Style & Layout 17% Script Parsing & Compilation 9% Rendering 6% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.indiebound.org/sites/default/files/js/js_BSv5lvt06hnnLveaEW3t_o6zVbrUvSWN9ZM8LPpry5g.js?scope=header&delta=0&language=en&theme=gavias_kunco&include=eJxtyFEKgDAIANALLTySmIjITAduwW5f39HXgycLObObvFzDjYIF5Ceb0m1U2Fdwgnqe5EfN7RbaNFNdkIJ8T-OCbzxZeCkq501ms227ms37ms3rd
https://www.indiebound.org/429ms5ms2ms3rd
Unattributable385ms57ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=UA-5829836-1162ms120ms33ms3rd
https://www.googletagmanager.com/gtag/js?id=G-NDW7XMP2RH&cx=c&gtm=4e64k1157ms121ms35ms3rd
https://cdn.curator.io/5.0/curator.embed.js101ms51ms46ms3rd
https://connect.facebook.net/en_US/bundle/sdk.js/92ms70ms22ms3rd
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
10 fonts (380 KB)
PASS
10 fonts (380 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

380 KB total

Render-blocking

0

of 10

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 FCP 4.2 s LCP 14.6 shttps://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 42.0 KiB — 65 ms — font-display: swaphttps://www.indiebound.org/themes/gavias_kunco/css/font-awesome/fonts/fontawesome-webfont.woff2?v=4.7.0fontawesome-webfont.woff2 https://www.indiebound.org/themes/gavias_kunco/css/font-awesome/fonts/fontawesome-webfont.woff2?v=4.7.0 — 75.7 KiB — 34 ms — font-display: swaphttps://www.indiebound.org/themes/gavias_kunco/fonts/icon/icon.ttf?blahfl=icon.ttf https://www.indiebound.org/themes/gavias_kunco/fonts/icon/icon.ttf?blahfl= — 227.6 KiB — 338 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLGT9Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLGT9Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLGT9Z1xlFd2JQEk.woff2 — 7.6 KiB — 60 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLEj6Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2 — 7.8 KiB — 36 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLCz7Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2 — 7.7 KiB — 41 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2pxiEyp8kv8JHgFVrJJfecnF... https://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2 — 7.7 KiB — 44 ms — font-display: swaphttps://bookshop.org/cf-fonts/s/ibm-plex-sans/5.0.18/latin/400/normal.woff2normal.woff2 https://bookshop.org/cf-fonts/s/ibm-plex-sans/5.0.18/latin/400/normal.woff2 — 1.2 KiB — 31 ms — font-display: swaphttps://bookshop.org/cf-fonts/s/ibm-plex-sans/5.0.18/latin/600/normal.woff2normal.woff2 https://bookshop.org/cf-fonts/s/ibm-plex-sans/5.0.18/latin/600/normal.woff2 — 1.2 KiB — 30 ms — font-display: swaphttps://bookshop.org/cf-fonts/s/pt-serif/5.0.19/latin/400/normal.woff2normal.woff2 https://bookshop.org/cf-fonts/s/pt-serif/5.0.19/latin/400/normal.woff2 — 1.2 KiB — 40 ms — font-display: swap
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 65 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.woff2 unknown swap
Size 76 KB
Load time 34 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
icon.ttf ttf swap
Size 228 KB
Load time 338 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
pxiByp8kv8JHgFVrLGT9Z1x... woff2 swap
Size 8 KB
Load time 60 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLEj6Z1x... woff2 swap
Size 8 KB
Load time 36 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLCz7Z1x... woff2 swap
Size 8 KB
Load time 41 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
pxiEyp8kv8JHgFVrJJfecnF... woff2 swap
Size 8 KB
Load time 44 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
normal.woff2 woff2 swap
Size 1 KB
Load time 31 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
normal.woff2 woff2 swap
Size 1 KB
Load time 30 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
normal.woff2 woff2 swap
Size 1 KB
Load time 40 ms
Start 1.9 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 ~205 KB and ~410 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: Cloudflare

Network Waterfall
57 requests over 2008ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 4.2 s LCP 14.6 shttps://indiebound.org// https://indiebound.org/ — 301 — 414 B — 344 ms — h2https://www.indiebound.org/www.indiebound.org/ https://www.indiebound.org/ — 200 — 43.7 KiB — 321 ms — h2https://www.googletagmanager.com/gtag/js?id=UA-5829836-1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-5829836-1 — 200 — 125.1 KiB — 170 ms — h2https://www.indiebound.org/sites/default/files/css/css_cc7mD-Z9Xe8RL1KXYnFhf5OwfF_chUxv9c1tZGjuZ0A.css?delta=0&language=en&theme=gavias_kunco&include=eJxtitEKgCAMAH_I9JNk6pLh3KJp4N_XY0RPxx2HM2bVRvigH0wgGQP-xFhwh8nDVbgILLYpWcNbvDUSf2L5LKwJeLOxmKQ6WzawhwSGNw7pMQEwww.indiebound.org/sites/default/fi... https://www.indiebound.org/sites/default/files/css/css_cc7mD-Z9Xe8RL1KXYnFhf5OwfF_chUxv9c1tZGjuZ0A.css?delta=0&language=en&theme=gavias_kunco&include=eJxtitEKgCAMAH_I9JNk6pLh3KJp4N_XY0RPxx2HM2bVRvigH0wgGQP-xFhwh8nDVbgILLYpWcNbvDUSf2L5LKwJeLOxmKQ6WzawhwSGNw7pMQE — 200 — 2.5 KiB — 312 ms — h2https://www.indiebound.org/sites/default/files/css/css_djYCW91R2br1VGcG1WHMSRiYch-H42KNCGgoB4a1keM.css?delta=1&language=en&theme=gavias_kunco&include=eJxtitEKgCAMAH_I9JNk6pLh3KJp4N_XY0RPxx2HM2bVRvigH0wgGQP-xFhwh8nDVbgILLYpWcNbvDUSf2L5LKwJeLOxmKQ6WzawhwSGNw7pMQEwww.indiebound.org/sites/default/fi... https://www.indiebound.org/sites/default/files/css/css_djYCW91R2br1VGcG1WHMSRiYch-H42KNCGgoB4a1keM.css?delta=1&language=en&theme=gavias_kunco&include=eJxtitEKgCAMAH_I9JNk6pLh3KJp4N_XY0RPxx2HM2bVRvigH0wgGQP-xFhwh8nDVbgILLYpWcNbvDUSf2L5LKwJeLOxmKQ6WzawhwSGNw7pMQE — 200 — 49.8 KiB — 506 ms — h2https://fonts.googleapis.com/css?family=Poppins:400,500,600,700fonts.googleapis.com/css?family=Pop... https://fonts.googleapis.com/css?family=Poppins:400,500,600,700 — 200 — 1013 B — 108 ms — h2https://fonts.googleapis.com/css?family=Open+Sans:400,600,700fonts.googleapis.com/css?family=Ope... https://fonts.googleapis.com/css?family=Open+Sans:400,600,700 — 200 — 1.8 KiB — 110 ms — h2https://www.indiebound.org/sites/default/files/css/css_4S21wY-zvO08bWdQrXaMF6-_sEDjk1Z95cjteRxBjio.css?delta=4&language=en&theme=gavias_kunco&include=eJxtitEKgCAMAH_I9JNk6pLh3KJp4N_XY0RPxx2HM2bVRvigH0wgGQP-xFhwh8nDVbgILLYpWcNbvDUSf2L5LKwJeLOxmKQ6WzawhwSGNw7pMQEwww.indiebound.org/sites/default/fi... https://www.indiebound.org/sites/default/files/css/css_4S21wY-zvO08bWdQrXaMF6-_sEDjk1Z95cjteRxBjio.css?delta=4&language=en&theme=gavias_kunco&include=eJxtitEKgCAMAH_I9JNk6pLh3KJp4N_XY0RPxx2HM2bVRvigH0wgGQP-xFhwh8nDVbgILLYpWcNbvDUSf2L5LKwJeLOxmKQ6WzawhwSGNw7pMQE — 200 — 41.3 KiB — 489 ms — h2https://www.indiebound.org/sites/default/files/js/js_BSv5lvt06hnnLveaEW3t_o6zVbrUvSWN9ZM8LPpry5g.js?scope=header&delta=0&language=en&theme=gavias_kunco&include=eJxtyFEKgDAIANALLTySmIjITAduwW5f39HXgycLObObvFzDjYIF5Ceb0m1U2Fdwgnqe5EfN7RbaNFNdkIJ8T-OCbzxZeCkqwww.indiebound.org/sites/default/fi... 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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 1826ms · 622KB · €20/mo
www.indiebound.org
Other
Costly
Execution 501ms
Transfer 126 KB
Unused 69%
Monthly Cost €5/mo
www.indiebound.org
Other
Costly
Execution 429ms
Transfer 44 KB
Monthly Cost €5/mo
Unattributable
Other
Costly
Execution 385ms
Transfer 0 KB
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Optional
Execution 162ms
Transfer 125 KB
Unused 51%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 157ms
Transfer 146 KB
Unused 43%
Monthly Cost €2/mo
cdn.curator.io
Other
Optional
Execution 101ms
Transfer 103 KB
Unused 72%
Monthly Cost €1/mo
Facebook Pixel
Advertising
Optional
Execution 92ms
Transfer 78 KB
Unused 70%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.indiebound.org adds 501ms and costs ~€5/month
  • www.indiebound.org adds 429ms and costs ~€5/month
  • Unattributable adds 385ms 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.indiebound.org takes 501ms 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.indiebound.org'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

www.indiebound.org takes 429ms 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 385ms 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 Google Tag Manager'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

72% of cdn.curator.io'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

70% of Facebook Pixel'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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