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https://flipsnack.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
4
REVIEW
4
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.
94
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.

746 ms

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

1.76 s

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

53 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.

1.18 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.

2.22 s

Page Load Progression

417 ms
833 ms
1.2 s
1.7 s
2.1 s
2.5 s
2.9 s
3.3 s
Checks
15
5 PASS 4 REVIEW 4 FIX
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 (1.3 MiB of 1.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
7 scripts, 312 KB unused
FIX
7 scripts, 312 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-XT3P...: 70 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-T8C...: 69 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-928...: 66 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://player.flipsnack.com/reader-bridge.gz.js: 40 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://player.flipsnack.com/reader-bridge.gz.js: unminified — 27 KB could be saved
Warning::
https://cdn.flipsnack.com/site/dist/genericv2.dbd3...: 34 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 312 KB
312 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-XT3P0H8SMY&l=dataLayerForGoogleTagManager&cx=c&gtm=4e64h1180 KB70 KB (39%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T8CXXNC&l=dataLayerForGoogleTagManager161 KB69 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-928025474&l=dataLayerForGoogleTagManager&cx=c&gtm=4e64h1147 KB66 KB (45%)✓3rd
https://player.flipsnack.com/reader-bridge.gz.js187 KB40 KB (62%)✗3rd
https://cdn.flipsnack.com/site/dist/genericv2.dbd387c09f8de4b79849.js52 KB34 KB (67%)✓3rd
https://cdn.flipsnack.com/site/dist/site-base.44ae0c81dcd683c648a9.js51 KB32 KB (63%)✓3rd
https://cdn.flipsnack.com/site/accessibility.min.js30 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
76 resources · 1.3 MB · 312 KB savings available
FIX
76 resources · 1.3 MB · 312 KB savings available
Warning::
Page weight 355 KB over 1MB target
Got: 1.3 MB Expected: ≤ 1 MB
Info::
~312 KB of savings available
Warning::
75 third-party resources (100% of weight)
76 resources · 1.3 MiB · 75 third-party 354.9 KiB over 1MB target
JavaScript 59% · 808.5 KiB
Image 28% · 382.6 KiB
Font 8% · 115.0 KiB
CSS 3% · 43.7 KiB
Document 2% · 28.0 KiB
Other 0% · 1.2 KiB

~311.9 KiB of savings available

Remove unused JavaScript: 311.9 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
Page Weight Budget
1.3 MB transferred, 76 requests
REVIEW
1.3 MB transferred, 76 requests
Info::
Page weighs 3.6 MB (1.3 MB transferred)
Warning::
JavaScript is 808 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 808 KB
Info::
76 HTTP requests
Info::
Estimated 0.28 g CO2 per page load
1.3 MB / 2.4 MB budget
1.3 MB transferred
76 requests
0.28 g CO2 per page load
JavaScript 808.5 KiB 59%
Images 379.5 KiB 28%
Fonts 115.0 KiB 8%
CSS 43.7 KiB 3%
HTML 28.0 KiB 2%
Other 3.3 KiB 0%
Other 915 B 0%
0 2.4 MB 4.9 MB
Under budget

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

B
Image Optimization
53 images, 0 KB saveable
REVIEW
53 images, 0 KB saveable
Info::
All images are well-optimized
53 images 380 KB
0 oversized -0 KB
33 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1280ms total JS execution
REVIEW
1280ms total JS execution
Warning::
https://www.flipsnack.com/: 378ms CPU time
Warning::
Unattributable: 262ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-XT3P...: 197ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-T8C...: 99ms CPU time
Info::
https://cdn.flipsnack.com/site/dist/site-base.44ae...: 87ms CPU time
Warning::
Third-party scripts: 1280ms (100% of total)

Main Thread Breakdown

Script Evaluation 37% Other 30% Style & Layout 13% Script Parsing & Compilation 9% Parse HTML & CSS 7% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.flipsnack.com/378ms11ms1ms3rd
Unattributable262ms6ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-XT3P0H8SMY&l=dataLayerForGoogleTagManager&cx=c&gtm=4e64h1197ms169ms25ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T8CXXNC&l=dataLayerForGoogleTagManager99ms77ms21ms3rd
https://cdn.flipsnack.com/site/dist/site-base.44ae0c81dcd683c648a9.js87ms58ms8ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-928025474&l=dataLayerForGoogleTagManager&cx=c&gtm=4e64h184ms64ms19ms3rd
https://cdn.flipsnack.com/site/accessibility.min.js65ms41ms5ms3rd
https://player.flipsnack.com/reader-bridge.gz.js54ms17ms36ms3rd
https://cdn.flipsnack.com/site/dist/genericv2.dbd387c09f8de4b79849.js53ms32ms8ms3rd
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 (115 KB)
PASS
7 fonts (115 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

115 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 FCP 746 ms LCP 1.8 shttps://cdn.flipsnack.com/site/fonts/visbycf-heavy.woff2visbycf-heavy.woff2 https://cdn.flipsnack.com/site/fonts/visbycf-heavy.woff2 — 16.3 KiB — 114 ms — font-display: swaphttps://cdn.flipsnack.com/site/fonts/roboto-v20-latin-300.woff2roboto-v20-latin-300.woff2 https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-300.woff2 — 15.9 KiB — 65 ms — font-display: swaphttps://cdn.flipsnack.com/site/fonts/roboto-v20-latin-300italic.woff2roboto-v20-latin-300ita... https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-300italic.woff2 — 17.5 KiB — 126 ms — font-display: swaphttps://cdn.flipsnack.com/site/fonts/roboto-v20-latin-regular.woff2roboto-v20-latin-regula... https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-regular.woff2 — 15.9 KiB — 111 ms — font-display: swaphttps://cdn.flipsnack.com/site/fonts/roboto-v20-latin-italic.woff2roboto-v20-latin-italic... https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-italic.woff2 — 17.4 KiB — 71 ms — font-display: swaphttps://cdn.flipsnack.com/site/fonts/roboto-v20-latin-500.woff2roboto-v20-latin-500.woff2 https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-500.woff2 — 16.0 KiB — 128 ms — font-display: swaphttps://cdn.flipsnack.com/site/fonts/roboto-v20-latin-700.woff2roboto-v20-latin-700.woff2 https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-700.woff2 — 15.9 KiB — 131 ms — font-display: swap
visbycf-heavy.woff2 woff2 swap
Size 16 KB
Load time 114 ms
Start 55 ms
Risk FOUT — text flashes from fallback to web font
roboto-v20-latin-300.woff2 woff2 swap
Size 16 KB
Load time 65 ms
Start 56 ms
Risk FOUT — text flashes from fallback to web font
roboto-v20-latin-300ita... woff2 swap
Size 18 KB
Load time 126 ms
Start 57 ms
Risk FOUT — text flashes from fallback to web font
roboto-v20-latin-regula... woff2 swap
Size 16 KB
Load time 111 ms
Start 57 ms
Risk FOUT — text flashes from fallback to web font
roboto-v20-latin-italic... woff2 swap
Size 17 KB
Load time 71 ms
Start 58 ms
Risk FOUT — text flashes from fallback to web font
roboto-v20-latin-500.woff2 woff2 swap
Size 16 KB
Load time 128 ms
Start 58 ms
Risk FOUT — text flashes from fallback to web font
roboto-v20-latin-700.woff2 woff2 swap
Size 16 KB
Load time 131 ms
Start 59 ms
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)
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
76 requests over 2724ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 746 ms LCP 1.8 shttps://flipsnack.com// https://flipsnack.com/ — 301 — 269 B — 15 ms — h2https://www.flipsnack.com/www.flipsnack.com/ https://www.flipsnack.com/ — 200 — 26.4 KiB — 24 ms — h2https://cdn.flipsnack.com/site/fonts/visbycf-heavy.woff2cdn.flipsnack.com/site/fonts/visbyc... https://cdn.flipsnack.com/site/fonts/visbycf-heavy.woff2 — 200 — 16.3 KiB — 114 ms — h2https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-300.woff2cdn.flipsnack.com/site/fonts/roboto... https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-300.woff2 — 200 — 15.9 KiB — 65 ms — h2https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-300italic.woff2cdn.flipsnack.com/site/fonts/roboto... https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-300italic.woff2 — 200 — 17.5 KiB — 126 ms — h2https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-regular.woff2cdn.flipsnack.com/site/fonts/roboto... https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-regular.woff2 — 200 — 15.9 KiB — 111 ms — h2https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-italic.woff2cdn.flipsnack.com/site/fonts/roboto... https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-italic.woff2 — 200 — 17.4 KiB — 71 ms — h2https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-500.woff2cdn.flipsnack.com/site/fonts/roboto... https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-500.woff2 — 200 — 16.0 KiB — 128 ms — h2https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-700.woff2cdn.flipsnack.com/site/fonts/roboto... https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-700.woff2 — 200 — 15.9 KiB — 131 ms — h2https://cdn.flipsnack.com/site/dist/bootstrap4.2b36294c012eb939f6df.csscdn.flipsnack.com/site/dist/bootstr... https://cdn.flipsnack.com/site/dist/bootstrap4.2b36294c012eb939f6df.css — 200 — 43.7 KiB — 116 ms — h2https://static.flipsnack.com/site/home/examples/flipbooks/finance-guide-flipbook-1x.avifstatic.flipsnack.com/site/home/exam... https://static.flipsnack.com/site/home/examples/flipbooks/finance-guide-flipbook-1x.avif — 200 — 15.9 KiB — 82 ms — h2https://static.flipsnack.com/site/home/examples/flipbooks/jewelry-flipbook-presentation-1x.avifstatic.flipsnack.com/site/home/exam... https://static.flipsnack.com/site/home/examples/flipbooks/jewelry-flipbook-presentation-1x.avif — 200 — 13.3 KiB — 135 ms — h2https://static.flipsnack.com/site/home/examples/flipbooks/hospitality-brochure-flipbook-1x.avifstatic.flipsnack.com/site/home/exam... https://static.flipsnack.com/site/home/examples/flipbooks/hospitality-brochure-flipbook-1x.avif — 200 — 16.5 KiB — 190 ms — h2https://static.flipsnack.com/site/home/examples/flipbooks/product-presentation-catalog-1x.avifstatic.flipsnack.com/site/home/exam... https://static.flipsnack.com/site/home/examples/flipbooks/product-presentation-catalog-1x.avif — 200 — 45.6 KiB — 109 ms — h2https://static.flipsnack.com/site/home/examples/flipbooks/cruises-presentation-brochure-1x.avifstatic.flipsnack.com/site/home/exam... https://static.flipsnack.com/site/home/examples/flipbooks/cruises-presentation-brochure-1x.avif — 200 — 12.3 KiB — 134 ms — h2https://static.flipsnack.com/site/home/examples/flipbooks/woodbine-hospitality-employee-benefits-booklet-1x.avifstatic.flipsnack.com/site/home/exam... https://static.flipsnack.com/site/home/examples/flipbooks/woodbine-hospitality-employee-benefits-booklet-1x.avif — 200 — 25.0 KiB — 132 ms — h2https://static.flipsnack.com/site/home/examples/flipbooks/business-magazine-flipbook-1x.avifstatic.flipsnack.com/site/home/exam... https://static.flipsnack.com/site/home/examples/flipbooks/business-magazine-flipbook-1x.avif — 200 — 14.8 KiB — 193 ms — h2https://static.flipsnack.com/site/home/examples/flipbooks/employee-benefits-presentation-flipbook-1x.avifstatic.flipsnack.com/site/home/exam... https://static.flipsnack.com/site/home/examples/flipbooks/employee-benefits-presentation-flipbook-1x.avif — 200 — 20.9 KiB — 202 ms — h2https://player.flipsnack.com/bridge.htmlplayer.flipsnack.com/bridge.html https://player.flipsnack.com/bridge.html — 200 — 1.6 KiB — 49 ms — h2https://cdn.flipsnack.com/site/accessibility.min.jscdn.flipsnack.com/site/accessibilit... https://cdn.flipsnack.com/site/accessibility.min.js — 200 — 30.3 KiB — 70 ms — h2https://cdn.flipsnack.com/site/images/pdf-preview/link.svgcdn.flipsnack.com/site/images/pdf-p... https://cdn.flipsnack.com/site/images/pdf-preview/link.svg — 200 — 913 B — 109 ms — h2https://cdn.flipsnack.com/site/images/pdf-preview/publish.svgcdn.flipsnack.com/site/images/pdf-p... https://cdn.flipsnack.com/site/images/pdf-preview/publish.svg — 200 — 756 B — 107 ms — h2https://cdn.flipsnack.com/site/images/pdf-preview/customize.svgcdn.flipsnack.com/site/images/pdf-p... https://cdn.flipsnack.com/site/images/pdf-preview/customize.svg — 200 — 925 B — 107 ms — h2https://static.flipsnack.com/site/home/logos/logo-7eleven.svgstatic.flipsnack.com/site/home/logo... https://static.flipsnack.com/site/home/logos/logo-7eleven.svg — 200 — 1.3 KiB — 115 ms — h2https://static.flipsnack.com/site/home/logos/logo-cisco.svgstatic.flipsnack.com/site/home/logo... https://static.flipsnack.com/site/home/logos/logo-cisco.svg — 200 — 2.0 KiB — 116 ms — h2https://cdn.flipsnack.com/site/images/flipsnack-logo-dark-blue.gz.svgcdn.flipsnack.com/site/images/flips... https://cdn.flipsnack.com/site/images/flipsnack-logo-dark-blue.gz.svg — 200 — 2.1 KiB — 102 ms — h2https://cdn.flipsnack.com/site/images/home/languages/usa-flag.gz.svgcdn.flipsnack.com/site/images/home/... https://cdn.flipsnack.com/site/images/home/languages/usa-flag.gz.svg — 200 — 1.1 KiB — 101 ms — h2https://cdn.flipsnack.com/site/images/home/languages/germany-flag.gz.svgcdn.flipsnack.com/site/images/home/... https://cdn.flipsnack.com/site/images/home/languages/germany-flag.gz.svg — 200 — 709 B — 101 ms — h2https://cdn.flipsnack.com/site/images/home/languages/france-flag.gz.svgcdn.flipsnack.com/site/images/home/... https://cdn.flipsnack.com/site/images/home/languages/france-flag.gz.svg — 200 — 695 B — 99 ms — h2https://cdn.flipsnack.com/site/images/home/languages/spain-flag.gz.svgcdn.flipsnack.com/site/images/home/... https://cdn.flipsnack.com/site/images/home/languages/spain-flag.gz.svg — 200 — 2.4 KiB — 100 ms — h3
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 746 ms LCP 1.8 shttps://flipsnack.com// https://flipsnack.com/ — 301 — 269 B — 15 ms — h2https://www.flipsnack.com/www.flipsnack.com/ https://www.flipsnack.com/ — 200 — 26.4 KiB — 24 ms — h2https://cdn.flipsnack.com/site/fonts/visbycf-heavy.woff2cdn.flipsnack.com/site/fonts/visbyc... https://cdn.flipsnack.com/site/fonts/visbycf-heavy.woff2 — 200 — 16.3 KiB — 114 ms — h2https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-300.woff2cdn.flipsnack.com/site/fonts/roboto... https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-300.woff2 — 200 — 15.9 KiB — 65 ms — h2https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-300italic.woff2cdn.flipsnack.com/site/fonts/roboto... https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-300italic.woff2 — 200 — 17.5 KiB — 126 ms — h2https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-regular.woff2cdn.flipsnack.com/site/fonts/roboto... https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-regular.woff2 — 200 — 15.9 KiB — 111 ms — h2https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-italic.woff2cdn.flipsnack.com/site/fonts/roboto... https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-italic.woff2 — 200 — 17.4 KiB — 71 ms — h2https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-500.woff2cdn.flipsnack.com/site/fonts/roboto... https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-500.woff2 — 200 — 16.0 KiB — 128 ms — h2https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-700.woff2cdn.flipsnack.com/site/fonts/roboto... https://cdn.flipsnack.com/site/fonts/roboto-v20-latin-700.woff2 — 200 — 15.9 KiB — 131 ms — h2https://cdn.flipsnack.com/site/dist/bootstrap4.2b36294c012eb939f6df.csscdn.flipsnack.com/site/dist/bootstr... https://cdn.flipsnack.com/site/dist/bootstrap4.2b36294c012eb939f6df.css — 200 — 43.7 KiB — 116 ms — h2https://static.flipsnack.com/site/home/examples/flipbooks/finance-guide-flipbook-1x.avifstatic.flipsnack.com/site/home/exam... https://static.flipsnack.com/site/home/examples/flipbooks/finance-guide-flipbook-1x.avif — 200 — 15.9 KiB — 82 ms — h2https://static.flipsnack.com/site/home/examples/flipbooks/jewelry-flipbook-presentation-1x.avifstatic.flipsnack.com/site/home/exam... https://static.flipsnack.com/site/home/examples/flipbooks/jewelry-flipbook-presentation-1x.avif — 200 — 13.3 KiB — 135 ms — h2https://static.flipsnack.com/site/home/examples/flipbooks/hospitality-brochure-flipbook-1x.avifstatic.flipsnack.com/site/home/exam... https://static.flipsnack.com/site/home/examples/flipbooks/hospitality-brochure-flipbook-1x.avif — 200 — 16.5 KiB — 190 ms — h2https://static.flipsnack.com/site/home/examples/flipbooks/product-presentation-catalog-1x.avifstatic.flipsnack.com/site/home/exam... https://static.flipsnack.com/site/home/examples/flipbooks/product-presentation-catalog-1x.avif — 200 — 45.6 KiB — 109 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 1280ms · 835KB · $17/mo
www.flipsnack.com
Other
Costly
Execution 378ms
Transfer 26 KB
Monthly Cost $5/mo
Unattributable
Other
Costly
Execution 262ms
Transfer 0 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 197ms
Transfer 180 KB
Unused 39%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 99ms
Transfer 161 KB
Unused 43%
Monthly Cost $1/mo
cdn.flipsnack.com
Other
Optional
Execution 87ms
Transfer 51 KB
Unused 63%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 84ms
Transfer 147 KB
Unused 45%
Monthly Cost $1/mo
cdn.flipsnack.com
Other
Optional
Execution 65ms
Transfer 30 KB
Monthly Cost $1/mo
player.flipsnack.com
Other
Optional
Execution 54ms
Transfer 187 KB
Unused 62%
Monthly Cost $1/mo
cdn.flipsnack.com
Other
Optional
Execution 53ms
Transfer 52 KB
Unused 67%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.flipsnack.com adds 378ms and costs ~$5/month
  • Unattributable adds 262ms and costs ~$3/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.

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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.flipsnack.com takes 378ms 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 262ms 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

63% of cdn.flipsnack.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

62% of player.flipsnack.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

67% of cdn.flipsnack.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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