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https://flipsnack.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
4
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
40
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
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.

3.08 s

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

12.20 s

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

1.38 s

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.

5.77 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

12.23 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
7 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 (1.5 MiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5154ms total JS execution
FIX
5154ms total JS execution
Warning::
https://www.flipsnack.com/: 1639ms CPU time
Warning::
Unattributable: 974ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-XT3P...: 695ms CPU time
Warning::
https://cdn.flipsnack.com/site/dist/genericv2.dbd3...: 410ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-T8C...: 398ms CPU time
Warning::
Third-party scripts: 5154ms (100% of total)

Main Thread Breakdown

Other 33% Script Evaluation 33% Style & Layout 12% Script Parsing & Compilation 9% Rendering 7% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.flipsnack.com/1639ms33ms3ms3rd
Unattributable974ms18ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-XT3P0H8SMY&l=dataLayerForGoogleTagManager&cx=c&gtm=4e64h1695ms597ms89ms3rd
https://cdn.flipsnack.com/site/dist/genericv2.dbd387c09f8de4b79849.js410ms109ms36ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T8CXXNC&l=dataLayerForGoogleTagManager398ms308ms84ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-928025474&l=dataLayerForGoogleTagManager&cx=c&gtm=4e64h1304ms222ms79ms3rd
https://cdn.flipsnack.com/site/accessibility.min.js268ms170ms20ms3rd
https://cdn.flipsnack.com/site/dist/site-base.44ae0c81dcd683c648a9.js268ms196ms33ms3rd
https://player.flipsnack.com/reader-bridge.gz.js199ms63ms133ms3rd
D
Page Weight Inventory
Action
69 resources · 1.5 MB · 272 KB savings available
FIX
69 resources · 1.5 MB · 272 KB savings available
Warning::
Page weight 555 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~272 KB of savings available
Warning::
68 third-party resources (100% of weight)
69 resources · 1.5 MiB · 68 third-party 555.2 KiB over 1MB target
JavaScript 51% · 808.3 KiB
Image 37% · 583.0 KiB
Font 7% · 115.0 KiB
CSS 3% · 43.7 KiB
Document 2% · 28.0 KiB
Other 0% · 1.2 KiB

~272.3 KiB of savings available

Remove unused JavaScript: 272.3 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
1.5 MB transferred, 69 requests
REVIEW
1.5 MB transferred, 69 requests
Info::
Page weighs 3.8 MB (1.5 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::
69 HTTP requests
Info::
Estimated 0.32 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
69 requests
0.32 g CO2 per page load
JavaScript 808.3 KiB 51%
Images 580.0 KiB 37%
Fonts 115.0 KiB 7%
CSS 43.7 KiB 3%
HTML 28.0 KiB 2%
Other 3.3 KiB 0%
Other 914 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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
46 images, 0 KB saveable
REVIEW
46 images, 0 KB saveable
Info::
All images are well-optimized
46 images 580 KB
0 oversized -0 KB
26 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
7 scripts, 272 KB unused
REVIEW
7 scripts, 272 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...: 70 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-928...: 65 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.flipsnack.com/site/dist/genericv2.dbd3...: 34 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.flipsnack.com/site/dist/site-base.44ae...: 32 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 272 KB
272 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 KB70 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-928025474&l=dataLayerForGoogleTagManager&cx=c&gtm=4e64h1147 KB65 KB (44%)✓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
https://player.flipsnack.com/reader-bridge.gz.js187 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

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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 3.1 s LCP 12.2 shttps://cdn.flipsnack.com/site/fonts/visbycf-heavy.woff2visbycf-heavy.woff2 https://cdn.flipsnack.com/site/fonts/visbycf-heavy.woff2 — 16.3 KiB — 92 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 — 71 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 — 104 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 — 93 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 — 90 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 — 102 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 — 16.0 KiB — 137 ms — font-display: swap
visbycf-heavy.woff2 woff2 swap
Size 16 KB
Load time 92 ms
Start 69 ms
Risk FOUT — text flashes from fallback to web font
roboto-v20-latin-300.woff2 woff2 swap
Size 16 KB
Load time 71 ms
Start 71 ms
Risk FOUT — text flashes from fallback to web font
roboto-v20-latin-300ita... woff2 swap
Size 18 KB
Load time 104 ms
Start 71 ms
Risk FOUT — text flashes from fallback to web font
roboto-v20-latin-regula... woff2 swap
Size 16 KB
Load time 93 ms
Start 71 ms
Risk FOUT — text flashes from fallback to web font
roboto-v20-latin-italic... woff2 swap
Size 17 KB
Load time 90 ms
Start 72 ms
Risk FOUT — text flashes from fallback to web font
roboto-v20-latin-500.woff2 woff2 swap
Size 16 KB
Load time 102 ms
Start 72 ms
Risk FOUT — text flashes from fallback to web font
roboto-v20-latin-700.woff2 woff2 swap
Size 16 KB
Load time 137 ms
Start 72 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
7 hints, 0 missing preconnects
PASS
7 hints, 0 missing preconnects
Info::
Page uses 7 resource hint(s)

Current Resource Hints

preconnect
—
preload
7
dns-prefetch
—
prefetch
—

7 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
69 requests over 2539ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 3.1 s LCP 12.2 shttps://flipsnack.com// https://flipsnack.com/ — 301 — 268 B — 21 ms — h2https://www.flipsnack.com/www.flipsnack.com/ https://www.flipsnack.com/ — 200 — 26.4 KiB — 25 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 — 92 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 — 71 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 — 104 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 — 93 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 — 90 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 — 102 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 — 16.0 KiB — 137 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 — 135 ms — h2https://static.flipsnack.com/site/home/examples/flipbooks/finance-guide-flipbook-2x.avifstatic.flipsnack.com/site/home/exam... https://static.flipsnack.com/site/home/examples/flipbooks/finance-guide-flipbook-2x.avif — 200 — 27.4 KiB — 141 ms — h2https://static.flipsnack.com/site/home/examples/flipbooks/jewelry-flipbook-presentation-2x.avifstatic.flipsnack.com/site/home/exam... https://static.flipsnack.com/site/home/examples/flipbooks/jewelry-flipbook-presentation-2x.avif — 200 — 24.4 KiB — 205 ms — h2https://static.flipsnack.com/site/home/examples/flipbooks/hospitality-brochure-flipbook-2x.avifstatic.flipsnack.com/site/home/exam... https://static.flipsnack.com/site/home/examples/flipbooks/hospitality-brochure-flipbook-2x.avif — 200 — 30.2 KiB — 140 ms — h2https://static.flipsnack.com/site/home/examples/flipbooks/product-presentation-catalog-2x.avifstatic.flipsnack.com/site/home/exam... https://static.flipsnack.com/site/home/examples/flipbooks/product-presentation-catalog-2x.avif — 200 — 82.8 KiB — 239 ms — h2https://static.flipsnack.com/site/home/examples/flipbooks/cruises-presentation-brochure-2x.avifstatic.flipsnack.com/site/home/exam... https://static.flipsnack.com/site/home/examples/flipbooks/cruises-presentation-brochure-2x.avif — 200 — 23.5 KiB — 189 ms — h2https://static.flipsnack.com/site/home/examples/flipbooks/woodbine-hospitality-employee-benefits-booklet-2x.avifstatic.flipsnack.com/site/home/exam... https://static.flipsnack.com/site/home/examples/flipbooks/woodbine-hospitality-employee-benefits-booklet-2x.avif — 200 — 50.7 KiB — 139 ms — h2https://static.flipsnack.com/site/home/examples/flipbooks/business-magazine-flipbook-2x.avifstatic.flipsnack.com/site/home/exam... https://static.flipsnack.com/site/home/examples/flipbooks/business-magazine-flipbook-2x.avif — 200 — 25.9 KiB — 248 ms — h2https://static.flipsnack.com/site/home/examples/flipbooks/employee-benefits-presentation-flipbook-2x.avifstatic.flipsnack.com/site/home/exam... https://static.flipsnack.com/site/home/examples/flipbooks/employee-benefits-presentation-flipbook-2x.avif — 200 — 41.8 KiB — 247 ms — h2https://player.flipsnack.com/bridge.htmlplayer.flipsnack.com/bridge.html https://player.flipsnack.com/bridge.html — 200 — 1.6 KiB — 75 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 — 912 B — 87 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 — 757 B — 89 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 — 924 B — 125 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 — 141 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 — 173 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 — 78 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 — 74 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 — 116 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 — 81 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 — 2.5 KiB — 91 ms — h2https://cdn.flipsnack.com/site/images/home/languages/portugal-flag.gz.svgcdn.flipsnack.com/site/images/home/... https://cdn.flipsnack.com/site/images/home/languages/portugal-flag.gz.svg — 200 — 1.8 KiB — 102 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 3.1 s LCP 12.2 shttps://flipsnack.com// https://flipsnack.com/ — 301 — 268 B — 21 ms — h2https://www.flipsnack.com/www.flipsnack.com/ https://www.flipsnack.com/ — 200 — 26.4 KiB — 25 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 — 92 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 — 71 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 — 104 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 — 93 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 — 90 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 — 102 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 — 16.0 KiB — 137 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 — 135 ms — h2https://static.flipsnack.com/site/home/examples/flipbooks/finance-guide-flipbook-2x.avifstatic.flipsnack.com/site/home/exam... https://static.flipsnack.com/site/home/examples/flipbooks/finance-guide-flipbook-2x.avif — 200 — 27.4 KiB — 141 ms — h2https://static.flipsnack.com/site/home/examples/flipbooks/jewelry-flipbook-presentation-2x.avifstatic.flipsnack.com/site/home/exam... https://static.flipsnack.com/site/home/examples/flipbooks/jewelry-flipbook-presentation-2x.avif — 200 — 24.4 KiB — 205 ms — h2https://static.flipsnack.com/site/home/examples/flipbooks/hospitality-brochure-flipbook-2x.avifstatic.flipsnack.com/site/home/exam... https://static.flipsnack.com/site/home/examples/flipbooks/hospitality-brochure-flipbook-2x.avif — 200 — 30.2 KiB — 140 ms — h2https://static.flipsnack.com/site/home/examples/flipbooks/product-presentation-catalog-2x.avifstatic.flipsnack.com/site/home/exam... https://static.flipsnack.com/site/home/examples/flipbooks/product-presentation-catalog-2x.avif — 200 — 82.8 KiB — 239 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 5154ms · 835KB · $68/mo
www.flipsnack.com
Other
Costly
Execution 1639ms
Transfer 26 KB
Monthly Cost $22/mo
Unattributable
Other
Costly
Execution 974ms
Transfer 0 KB
Monthly Cost $13/mo
Google Tag Manager
Tag Manager
Costly
Execution 695ms
Transfer 180 KB
Unused 39%
Monthly Cost $9/mo
cdn.flipsnack.com
Other
Costly
Execution 410ms
Transfer 52 KB
Unused 67%
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 398ms
Transfer 161 KB
Unused 43%
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 304ms
Transfer 147 KB
Unused 44%
Monthly Cost $4/mo
cdn.flipsnack.com
Other
Costly
Execution 268ms
Transfer 30 KB
Monthly Cost $4/mo
cdn.flipsnack.com
Other
Costly
Execution 268ms
Transfer 51 KB
Unused 63%
Monthly Cost $4/mo
player.flipsnack.com
Other
Optional
Execution 199ms
Transfer 187 KB
Monthly Cost $3/mo

These scripts may cost more than they're worth

  • www.flipsnack.com adds 1639ms and costs ~$22/month
  • Unattributable adds 974ms and costs ~$13/month
  • Google Tag Manager adds 695ms and costs ~$9/month
  • cdn.flipsnack.com adds 410ms and costs ~$5/month
  • Google Tag Manager adds 398ms and costs ~$5/month
  • Google Tag Manager adds 304ms and costs ~$4/month
  • cdn.flipsnack.com adds 268ms and costs ~$4/month
  • cdn.flipsnack.com adds 268ms 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.flipsnack.com takes 1639ms 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 974ms 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

Google Tag Manager takes 695ms 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

cdn.flipsnack.com takes 410ms 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

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

Google Tag Manager takes 398ms 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

Google Tag Manager takes 304ms 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

cdn.flipsnack.com takes 268ms 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

cdn.flipsnack.com takes 268ms 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

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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