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https://indiebound.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
5
REVIEW
1
PASS
7
INFO
2

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

Mobile Desktop
78
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.
100
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.

1.26 s

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

2.81 s

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

4 ms

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

0.080

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

1.65 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.

2.81 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
7 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
2.8 MB transferred, 56 requests
FIX
2.8 MB transferred, 56 requests
Warning::
Page weighs 5.0 MB (2.8 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 642 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 642 KB
Info::
56 HTTP requests
Info::
Estimated 0.59 g CO2 per page load
2.8 MB / 2.4 MB budget
2.8 MB transferred
56 requests
0.59 g CO2 per page load
Images 1.8 MiB 65%
JavaScript 641.7 KiB 22%
Fonts 152.3 KiB 5%
CSS 115.2 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

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 (2.8 MiB of 2.8 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=4e64k1h1146 KB63 KB (43%)✓3rd
https://connect.facebook.net/en_US/bundle/sdk.js/78 KB55 KB (70%)✓3rd
https://cdn.curator.io/published/68f39721-20e6-4b52-a06a-87b8086fe285.js1 KB—✓3rd
https://www.google-analytics.com/analytics.js21 KB—✓3rd
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451611 KB—✓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://bookshop.org/gtgbkshp/1 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
56 resources · 2.8 MB · 341 KB savings available
FIX
56 resources · 2.8 MB · 341 KB savings available
Warning::
Page weight 1.8 MB over 1MB target
Got: 2.8 MB Expected: ≤ 1 MB
Info::
~341 KB of savings available
Warning::
55 third-party resources (100% of weight)
Info::
3 resources over 200KB
56 resources · 2.8 MiB · 55 third-party 1.8 MiB over 1MB target
Image 67% · 1.9 MiB
JavaScript 22% · 641.7 KiB
Font 5% · 152.3 KiB
CSS 4% · 115.2 KiB
Document 2% · 49.4 KiB
Other 0% · 3.0 KiB

~340.8 KiB of savings available

Remove unused JavaScript: 340.8 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
15 images, 0 KB saveable
REVIEW
15 images, 0 KB saveable
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
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+
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+
JS Execution Cost
416ms total JS execution
PASS
416ms total JS execution
Info::
https://www.indiebound.org/sites/default/files/js/...: 141ms CPU time
Info::
https://www.indiebound.org/: 116ms CPU time
Info::
Unattributable: 104ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-NDW7...: 56ms CPU time
Warning::
Third-party scripts: 416ms (100% of total)

Main Thread Breakdown

Script Evaluation 39% Other 22% Style & Layout 20% Script Parsing & Compilation 9% Rendering 5% Parse HTML & CSS 5%
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-OCbzxZeCkq141ms68ms9ms3rd
https://www.indiebound.org/116ms1ms0ms3rd
Unattributable104ms18ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-NDW7XMP2RH&cx=c&gtm=4e64k1h156ms40ms11ms3rd
A+
Font Loading
9 fonts (152 KB)
PASS
9 fonts (152 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

152 KB total

Render-blocking

0

of 9

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.3 s LCP 2.8 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 — 61 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 — 28 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLGT9Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLGT9Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLGT9Z1xlFd2JQEk.woff2 — 7.6 KiB — 52 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2pxiEyp8kv8JHgFVrJJfecnF... https://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2 — 7.7 KiB — 40 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLEj6Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2 — 7.8 KiB — 29 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLCz7Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2 — 7.7 KiB — 29 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 — 25 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 — 27 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 61 ms
Start 864 ms
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.woff2 unknown swap
Size 76 KB
Load time 28 ms
Start 864 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLGT9Z1x... woff2 swap
Size 8 KB
Load time 52 ms
Start 864 ms
Risk FOUT — text flashes from fallback to web font
pxiEyp8kv8JHgFVrJJfecnF... woff2 swap
Size 8 KB
Load time 40 ms
Start 864 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLEj6Z1x... woff2 swap
Size 8 KB
Load time 29 ms
Start 959 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLCz7Z1x... woff2 swap
Size 8 KB
Load time 29 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
normal.woff2 woff2 swap
Size 1 KB
Load time 25 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
normal.woff2 woff2 swap
Size 1 KB
Load time 27 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
normal.woff2 woff2 swap
Size 1 KB
Load time 40 ms
Start 1.2 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 ~23 KB and ~46 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+
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
56 requests over 1369ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.3 s LCP 2.8 shttps://indiebound.org// https://indiebound.org/ — 301 — 415 B — 341 ms — h2https://www.indiebound.org/www.indiebound.org/ https://www.indiebound.org/ — 200 — 43.7 KiB — 486 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 — 169 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 — 47 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 — 48 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 — 89 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 — 92 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 — 41.4 KiB — 27 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... https://www.indiebound.org/sites/default/files/js/js_BSv5lvt06hnnLveaEW3t_o6zVbrUvSWN9ZM8LPpry5g.js?scope=header&delta=0&language=en&theme=gavias_kunco&include=eJxtyFEKgDAIANALLTySmIjITAduwW5f39HXgycLObObvFzDjYIF5Ceb0m1U2Fdwgnqe5EfN7RbaNFNdkIJ8T-OCbzxZeCkq — 200 — 125.7 KiB — 63 ms — h2https://www.indiebound.org/themes/gavias_kunco/css/custom.csswww.indiebound.org/themes/gavias_ku... https://www.indiebound.org/themes/gavias_kunco/css/custom.css — 200 — 304 B — 28 ms — h2https://www.indiebound.org/themes/gavias_kunco/css/update.csswww.indiebound.org/themes/gavias_ku... https://www.indiebound.org/themes/gavias_kunco/css/update.css — 200 — 1.0 KiB — 43 ms — h2https://www.indiebound.org/sites/default/files/IB-NewLogo-HeaderNav-70px.pngwww.indiebound.org/sites/default/fi... https://www.indiebound.org/sites/default/files/IB-NewLogo-HeaderNav-70px.png — 200 — 7.6 KiB — 24 ms — h2https://bookshop.org/widgets.jsbookshop.org/widgets.js https://bookshop.org/widgets.js — 200 — 2.8 KiB — 65 ms — 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— 470 B — 19 ms — h2https://cdn.curator.io/5.0/curator.embed.jscdn.curator.io/5.0/curator.embed.js https://cdn.curator.io/5.0/curator.embed.js — 200 — 103.1 KiB — 44 ms — h2https://bookshop.org/gtgbkshp/bookshop.org/gtgbkshp/ https://bookshop.org/gtgbkshp/ — 403 — 1.2 KiB — 26 ms — h3https://bookshop.org/cf-fonts/s/ibm-plex-sans/5.0.18/latin/400/normal.woff2bookshop.org/cf-fonts/s/ibm-plex-sa... https://bookshop.org/cf-fonts/s/ibm-plex-sans/5.0.18/latin/400/normal.woff2 — 403 — 1.2 KiB — 25 ms — h3https://bookshop.org/cf-fonts/s/ibm-plex-sans/5.0.18/latin/600/normal.woff2bookshop.org/cf-fonts/s/ibm-plex-sa... https://bookshop.org/cf-fonts/s/ibm-plex-sans/5.0.18/latin/600/normal.woff2 — 403 — 1.2 KiB — 27 ms — h3https://bookshop.org/cf-fonts/s/pt-serif/5.0.19/latin/400/normal.woff2bookshop.org/cf-fonts/s/pt-serif/5.... https://bookshop.org/cf-fonts/s/pt-serif/5.0.19/latin/400/normal.woff2 — 403 — 1.2 KiB — 40 ms — h3https://bookshop.org/cdn-cgi/challenge-platform/scripts/jsd/main.jsbookshop.org/cdn-cgi/challenge-plat... https://bookshop.org/cdn-cgi/challenge-platform/scripts/jsd/main.js — 302 — 468 B — 36 ms — h3https://bookshop.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?bookshop.org/cdn-cgi/challenge-plat... https://bookshop.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js? — 200 — 13.6 KiB — 23 ms — h3https://bookshop.org/cdn-cgi/rum?bookshop.org/cdn-cgi/rum? https://bookshop.org/cdn-cgi/rum? — 204 — 424 B — 22 ms — h3https://connect.facebook.net/en_US/sdk.jsconnect.facebook.net/en_US/sdk.js https://connect.facebook.net/en_US/sdk.js — 200 — 5.0 KiB — 10 ms — h3https://connect.facebook.net/en_US/bundle/sdk.js/connect.facebook.net/en_US/bundle/s... https://connect.facebook.net/en_US/bundle/sdk.js/ — 200 — 78.5 KiB — 14 ms — h3https://www.indiebound.org/sites/default/files/IndieBound-favicon.pngwww.indiebound.org/sites/default/fi... https://www.indiebound.org/sites/default/files/IndieBound-favicon.png — 200 — 62.5 KiB — 24 ms — h2https://bookshop.org/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.15003100145269122:1776899610:ocN79iLeoMzLIrbO7RufIK3kxf6HJgAQAGMI3HucTfc/9f0880005af988c5bookshop.org/cdn-cgi/challenge-plat... https://bookshop.org/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.15003100145269122:1776899610:ocN79iLeoMzLIrbO7RufIK3kxf6HJgAQAGMI3HucTfc/9f0880005af988c5 — 200 — 1.6 KiB — 23 ms — h3
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 416ms · 316KB · €5/mo
www.indiebound.org
Other
Optional
Execution 141ms
Transfer 126 KB
Unused 69%
Monthly Cost €2/mo
www.indiebound.org
Other
Optional
Execution 116ms
Transfer 44 KB
Monthly Cost €1/mo
Unattributable
Other
Optional
Execution 104ms
Transfer 0 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 56ms
Transfer 146 KB
Unused 43%
Monthly Cost €1/mo

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

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

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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