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https://overdrive.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
83
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.
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.

870 ms

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

2.83 s

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

0 ms

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

0.035

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

1.27 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.

2.84 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
6 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
3.7 MB transferred, 70 requests
FIX
3.7 MB transferred, 70 requests
Warning::
Page weighs 4.2 MB (3.7 MB transferred)
Warning::
Images are 2.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.5 MB
Warning::
JavaScript is 653 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 653 KB
Info::
Fonts are 424 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 424 KB
Info::
70 HTTP requests
Info::
Estimated 0.77 g CO2 per page load
3.7 MB / 2.4 MB budget
3.7 MB transferred
70 requests
0.77 g CO2 per page load
Images 2.5 MiB 67%
JavaScript 653.4 KiB 17%
Fonts 423.5 KiB 11%
CSS 131.0 KiB 4%
HTML 7.4 KiB 0%
Other 5.5 KiB 0%
Other 1.8 KiB 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 (3.7 MiB of 3.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
6 scripts, 343 KB unused
FIX
6 scripts, 343 KB unused
Warning::
https://www.overdrive.com/bundles/js?v=2gydoUhtk4t...: 343 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.overdrive.com/bundles/js?v=2gydoUhtk4t...: unminified — 297 KB could be saved
Info::
Total unused JavaScript: 343 KB
343 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.overdrive.com/bundles/js?v=2gydoUhtk4txS1onfETaiECQZhP-o5fvkYEoj-ZhDkQ1604 KB343 KB (57%)✗3rd
https://www.overdrive.com/Content/js/vendor/modernizr.min.js4 KB—✓3rd
https://www.overdrive.com/bundles/Allv2js?v=EDFeTXn4IfYeLRbrLiObpYLHjDBlnGsxgK_mJKwcSTM133 KB—✓3rd
https://www.overdrive.com/Content/js/v2/bundles/All_bundle.js4 KB—✓3rd
https://www.overdrive.com/Content/js/v2/bundles/MainNavigationV2_bundle.js1 KB—✓3rd
https://www.overdrive.com/bundles/SiteSearchV2js?v=N2x1dGX8mPeiaJjC4ZoQru8FV8LqFnEM5oNJtI7eYsI17 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

D
Page Weight Inventory
Action
70 resources · 3.7 MB · 343 KB savings available
FIX
70 resources · 3.7 MB · 343 KB savings available
Warning::
Page weight 2.7 MB over 1MB target
Got: 3.7 MB Expected: ≤ 1 MB
Info::
~343 KB of savings available
Warning::
69 third-party resources (100% of weight)
Info::
3 resources over 200KB
70 resources · 3.7 MiB · 69 third-party 2.7 MiB over 1MB target
Image 67% · 2.5 MiB
JavaScript 17% · 653.4 KiB
Font 11% · 423.5 KiB
CSS 4% · 131.0 KiB
Document 0% · 12.9 KiB
Other 0% · 201 B

~343.1 KiB of savings available

Remove unused JavaScript: 343.1 KiB
C
Image Optimization
Action
42 images, 0 KB saveable
REVIEW
42 images, 0 KB saveable
Warning::
https://img1.od-cdn.com/ImageType-400/0017-1/%7B52... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img1.od-cdn.com/ImageType-400/0111-1/%7B44... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.overdrive.com/Content/img/apps/libby-w... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.overdrive.com/Content/img/B-Corp.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img1.od-cdn.com/ImageType-400/0111-1/CC2/8... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img1.od-cdn.com/ImageType-400/0111-1/%7B7B... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.overdrive.com/Content/img/org-innovate... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.overdrive.com/Content/img/OverDrive_Lo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.overdrive.com/Content/img/apps/kanopy-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.overdrive.com/Content/img/apps/tb-word... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img1.od-cdn.com/ImageType-400/0017-1/%7B1B... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.overdrive.com/Content/img/org-educate.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img1.od-cdn.com/ImageType-400/0439-1/%7B7A... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.overdrive.com/Content/img/apps/LibbyDe... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.overdrive.com/Content/img/social/Linke... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img1.od-cdn.com/ImageType-400/0111-1/%7BAD... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img1.od-cdn.com/ImageType-400/0111-1/%7BC1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.overdrive.com/Content/img/social/Faceb... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.overdrive.com/Content/img/social/youtu... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img1.od-cdn.com/ImageType-400/1209-1/%7BB1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img1.od-cdn.com/ImageType-400/2343-1/%7BE4... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img1.od-cdn.com/ImageType-400/1191-1/%7BCE... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.overdrive.com/Content/img/apps/sora-wo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.overdrive.com/Content/img/social/blues... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.overdrive.com/Content/img/social/threa... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img1.od-cdn.com/ImageType-400/2363-1/%7B93... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img1.od-cdn.com/ImageType-400/16996-1/%7B6... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img1.od-cdn.com/ImageType-400/0017-1/%7BF6... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.overdrive.com/Content/img/apps/libby-l... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.overdrive.com/Content/img/kanopy/kanop... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.overdrive.com/Content/img/org-discover... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img1.od-cdn.com/ImageType-400/0111-1/%7B9B... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.overdrive.com/Content/img/OverDrive_Lo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.overdrive.com/Content/img/social/Insta... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
42 images 2.5 MB
0 oversized -0 KB
39 legacy format
34 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

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

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

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

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

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

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

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

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

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

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

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
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
no-cache
REVIEW
no-cache
Info::
Cache-Control header is set
Got: no-cache
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-cache

DirectiveValueMeaning
no-cache—Cache but always revalidate first
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
354ms total JS execution
PASS
354ms total JS execution
Info::
https://www.overdrive.com/: 155ms CPU time
Info::
Unattributable: 111ms CPU time
Info::
https://www.overdrive.com/bundles/js?v=2gydoUhtk4t...: 88ms CPU time
Warning::
Third-party scripts: 354ms (100% of total)

Main Thread Breakdown

Other 36% Style & Layout 31% Script Evaluation 16% Rendering 9% Script Parsing & Compilation 5% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.overdrive.com/155ms3ms1ms3rd
Unattributable111ms3ms0ms3rd
https://www.overdrive.com/bundles/js?v=2gydoUhtk4txS1onfETaiECQZhP-o5fvkYEoj-ZhDkQ188ms41ms16ms3rd
A+
Font Loading
7 fonts (424 KB)
PASS
7 fonts (424 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

424 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 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 870 ms LCP 2.8 shttps://www.overdrive.com/Content/fonts/lineto-brown-light.wofflineto-brown-light.woff https://www.overdrive.com/Content/fonts/lineto-brown-light.woff — 64.1 KiB — 318 ms — font-display: swaphttps://www.overdrive.com/Content/fonts/2D64F3_3_0.woff22D64F3_3_0.woff2 https://www.overdrive.com/Content/fonts/2D64F3_3_0.woff2 — 54.2 KiB — 315 ms — font-display: swaphttps://www.overdrive.com/Content/fonts/lineto-brown-bold.wofflineto-brown-bold.woff https://www.overdrive.com/Content/fonts/lineto-brown-bold.woff — 65.5 KiB — 317 ms — font-display: swaphttps://static.od-cdn.com/lineto-brown-regular.wofflineto-brown-regular.woff https://static.od-cdn.com/lineto-brown-regular.woff — 62.6 KiB — 101 ms — font-display: swaphttps://www.overdrive.com/Content/fonts/2D64F3_8_0.woff22D64F3_8_0.woff2 https://www.overdrive.com/Content/fonts/2D64F3_8_0.woff2 — 48.4 KiB — 237 ms — font-display: swaphttps://www.overdrive.com/Content/fonts/lineto-brown-bolditalic.wofflineto-brown-bolditalic... https://www.overdrive.com/Content/fonts/lineto-brown-bolditalic.woff — 65.1 KiB — 317 ms — font-display: swaphttps://www.overdrive.com/Content/fonts/lineto-brown-lightitalic.wofflineto-brown-lightitali... https://www.overdrive.com/Content/fonts/lineto-brown-lightitalic.woff — 63.7 KiB — 139 ms — font-display: swap
lineto-brown-light.woff woff swap
Size 64 KB
Load time 318 ms
Start 784 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
2D64F3_3_0.woff2 woff2 swap
Size 54 KB
Load time 315 ms
Start 784 ms
Risk FOUT — text flashes from fallback to web font
lineto-brown-bold.woff woff swap
Size 65 KB
Load time 317 ms
Start 808 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
lineto-brown-regular.woff woff swap
Size 63 KB
Load time 101 ms
Start 903 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
2D64F3_8_0.woff2 woff2 swap
Size 48 KB
Load time 237 ms
Start 906 ms
Risk FOUT — text flashes from fallback to web font
lineto-brown-bolditalic... woff swap
Size 65 KB
Load time 317 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
lineto-brown-lightitali... woff swap
Size 64 KB
Load time 139 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~96 KB and ~192 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
70 requests over 1643ms
INFO
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data:image/svg+xml,%3C%3Fxml%20version%3D%221.0%22%20encoding%3D%22utf-8%22%3F%3E%0D%0A%3C%21--%20G… — 200 — 0 B — 0 ms — datahttps://img1.od-cdn.com/ImageType-400/0111-1/%7B9B739A94-5608-4846-AFD9-98F0B60BFF84%7DIMG400.JPGimg1.od-cdn.com/ImageType-400/0111-... https://img1.od-cdn.com/ImageType-400/0111-1/%7B9B739A94-5608-4846-AFD9-98F0B60BFF84%7DIMG400.JPG — 200 — 25.9 KiB — 79 ms — h2https://img1.od-cdn.com/ImageType-400/0439-1/%7B7A7A296D-89B9-465C-9A6A-39466244CABE%7DIMG400.JPGimg1.od-cdn.com/ImageType-400/0439-... https://img1.od-cdn.com/ImageType-400/0439-1/%7B7A7A296D-89B9-465C-9A6A-39466244CABE%7DIMG400.JPG — 200 — 20.1 KiB — 95 ms — h2https://img1.od-cdn.com/ImageType-400/16996-1/%7B6E557FF2-B3E5-45E0-9077-EB254B75FDE0%7DIMG400.JPGimg1.od-cdn.com/ImageType-400/16996... https://img1.od-cdn.com/ImageType-400/16996-1/%7B6E557FF2-B3E5-45E0-9077-EB254B75FDE0%7DIMG400.JPG — 200 — 37.1 KiB — 88 ms — h2https://img1.od-cdn.com/ImageType-400/2343-1/%7BE43E10BB-EA82-4098-9794-EC755F02F80C%7DIMG400.JPGimg1.od-cdn.com/ImageType-400/2343-... https://img1.od-cdn.com/ImageType-400/2343-1/%7BE43E10BB-EA82-4098-9794-EC755F02F80C%7DIMG400.JPG — 200 — 33.1 KiB — 106 ms — h2https://img1.od-cdn.com/ImageType-400/0111-1/%7BC122A37F-F984-4062-8F35-1072A99305A0%7DIMG400.JPGimg1.od-cdn.com/ImageType-400/0111-... https://img1.od-cdn.com/ImageType-400/0111-1/%7BC122A37F-F984-4062-8F35-1072A99305A0%7DIMG400.JPG — 200 — 45.7 KiB — 101 ms — h2https://img1.od-cdn.com/ImageType-400/0017-1/%7BF6A0CCC2-DF05-4F91-B2D8-CFDF85E636D3%7DIMG400.JPGimg1.od-cdn.com/ImageType-400/0017-... https://img1.od-cdn.com/ImageType-400/0017-1/%7BF6A0CCC2-DF05-4F91-B2D8-CFDF85E636D3%7DIMG400.JPG — 200 — 34.1 KiB — 106 ms — h2https://img1.od-cdn.com/ImageType-400/0111-1/%7B7B1B3382-04E5-49DD-8D5A-3709B8610CD2%7DIMG400.JPGimg1.od-cdn.com/ImageType-400/0111-... https://img1.od-cdn.com/ImageType-400/0111-1/%7B7B1B3382-04E5-49DD-8D5A-3709B8610CD2%7DIMG400.JPG — 200 — 42.2 KiB — 109 ms — h2https://img1.od-cdn.com/ImageType-400/1191-1/%7BCE06150D-033E-447D-819C-CEB56EF6333C%7DIMG400.JPGimg1.od-cdn.com/ImageType-400/1191-... https://img1.od-cdn.com/ImageType-400/1191-1/%7BCE06150D-033E-447D-819C-CEB56EF6333C%7DIMG400.JPG — 200 — 38.9 KiB — 111 ms — h2https://img1.od-cdn.com/ImageType-400/0017-1/%7B1B335EFF-A3FF-4C63-B385-BC2C68623941%7DIMG400.JPGimg1.od-cdn.com/ImageType-400/0017-... https://img1.od-cdn.com/ImageType-400/0017-1/%7B1B335EFF-A3FF-4C63-B385-BC2C68623941%7DIMG400.JPG — 200 — 28.4 KiB — 98 ms — h2https://www.overdrive.com/favicon.icowww.overdrive.com/favicon.ico https://www.overdrive.com/favicon.ico — 200 — 1.6 KiB — 136 ms — h2
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 354ms · 611KB · $5/mo
www.overdrive.com
Other
Optional
Execution 155ms
Transfer 7 KB
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 111ms
Transfer 0 KB
Monthly Cost $1/mo
www.overdrive.com
Other
Optional
Execution 88ms
Transfer 604 KB
Unused 57%
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

57% of www.overdrive.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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