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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
6
REVIEW
2
PASS
5
INFO
2

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

Mobile Desktop
87
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.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

684 ms

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

1.72 s

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

41 ms

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

0.022

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

2.70 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.

2.21 s

Page Load Progression

771 ms
1.5 s
2.3 s
3.1 s
3.9 s
4.6 s
5.4 s
6.2 s
Checks
15
5 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
4.7 MB transferred, 131 requests
FIX
4.7 MB transferred, 131 requests
Critical::
Page weighs 12.5 MB (4.7 MB transferred)
Warning::
JavaScript is 2.6 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.6 MB
Warning::
Images are 1.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.4 MB
Info::
CSS is 332 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 332 KB
Warning::
131 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.99 g CO2 per page load
4.7 MB / 2.4 MB budget
4.7 MB transferred
131 requests
0.99 g CO2 per page load
JavaScript 2.6 MiB 55%
Images 1.4 MiB 29%
CSS 331.5 KiB 7%
Other 229.5 KiB 5%
Fonts 87.2 KiB 2%
HTML 66.9 KiB 1%
Other 19.7 KiB 0%
Other 968 B 0%
Other 542 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over 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

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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
84% third-party, 0 ms blocking
FIX
84% third-party, 0 ms blocking
Warning::
Third-party code accounts for 84% of page weight (3.9 MiB of 4.7 MiB)
Info::
Third-party blocking time is low (0 ms)
16%
84%
First-party Third-party
D
JS Execution Cost
Action
2449ms total JS execution
FIX
2449ms total JS execution
Warning::
https://e.issuu.com/reader4/bfd92a7/_next/static/c...: 701ms CPU time
Warning::
https://e.issuu.com/reader4/latest/landing-page-em...: 256ms CPU time
Info::
Unattributable: 242ms CPU time
Info::
https://consent.cookiebot.com/94fb9e27-f09e-4da3-9...: 224ms CPU time
Info::
https://issuu.com/: 219ms CPU time
Warning::
Third-party scripts: 1986ms (81% of total)

Main Thread Breakdown

Script Evaluation 55% Other 22% Style & Layout 7% Script Parsing & Compilation 5% Parse HTML & CSS 4% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://e.issuu.com/reader4/bfd92a7/_next/static/chunks/884-826d4e9d70dca469.js701ms543ms4ms3rd
https://e.issuu.com/reader4/latest/landing-page-embed.html?u=issuu&d=issuu_publicpage&hideIssuuLogo=false&doAutoflipPages=true&backgroundColor=3e3c51&autoFlipInterval=5000&firstPageAutoFlipDelay=2000256ms0ms1ms3rd
Unattributable242ms15ms0ms3rd
https://consent.cookiebot.com/94fb9e27-f09e-4da3-961c-27a7778ee938/cc.js?renew=false&referer=issuu.com&dnt=false&init=false&framework=TCFv2.3&georegions=%5B%7B%22r%22%3A%22US%2CAU%2CCA%2CMX%22%2C%22i%22%3A%22ef9a9ad7-7959-4937-8c70-cb12e3a0cda4%22%7D%5D224ms90ms26ms3rd
https://issuu.com/219ms58ms2ms1st
https://e.issuu.com/reader4/bfd92a7/_next/static/chunks/5670893b-7d3df2355bf7e447.js181ms121ms4ms3rd
https://issuu.com/publisher-space/assets/_next/static/chunks/2094-7b4cd0add0aa36aa.js162ms154ms3ms1st
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js149ms118ms26ms3rd
https://e.issuu.com/reader4/bfd92a7/_next/static/chunks/51-7b68cbc8612375be.js111ms58ms4ms3rd
https://issuu.com/publisher-space/assets/_next/static/chunks/8991-4beae5bdf0180e85.js82ms75ms1ms1st

Showing top 10 of 12 scripts

F
JS Bundles
Action
66 scripts, 1.1 MB unused
FIX
66 scripts, 1.1 MB unused
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://e.issuu.com/reader4/bfd92a7/_next/static/c...: 117 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://e.issuu.com/reader4/bfd92a7/_next/static/c...: 116 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.1 MB
1080 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://e.issuu.com/reader4/bfd92a7/_next/static/chunks/665-bb1573f070901b7c.js233 KB117 KB (50%)✓3rd
https://e.issuu.com/reader4/bfd92a7/_next/static/chunks/51-7b68cbc8612375be.js243 KB116 KB (48%)✓3rd
https://e.issuu.com/reader4/bfd92a7/_next/static/chunks/884-826d4e9d70dca469.js169 KB76 KB (45%)✓3rd
https://accounts.google.com/gsi/client96 KB68 KB (71%)✓3rd
https://consent.cookiebot.com/Framework/IAB/consent-sdk-2.3.js88 KB64 KB (73%)✓3rd
https://e.issuu.com/reader4/bfd92a7/_next/static/chunks/5670893b-7d3df2355bf7e447.js169 KB46 KB (27%)✓3rd
https://e.issuu.com/reader4/bfd92a7/_next/static/chunks/542-97c6d0cbfa42a346.js107 KB42 KB (39%)✓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

F
Page Weight Inventory
Action
131 resources · 4.7 MB · 1.1 MB savings available
FIX
131 resources · 4.7 MB · 1.1 MB savings available
Warning::
Page weight 3.7 MB over 1MB target
Got: 4.7 MB Expected: ≤ 1 MB
Info::
~1.1 MB of savings available
Warning::
62 third-party resources (84% of weight)
Info::
10 resources over 200KB
131 resources · 4.7 MiB · 62 third-party 3.7 MiB over 1MB target
JavaScript 55% · 2.6 MiB
Image 34% · 1.6 MiB
CSS 7% · 331.5 KiB
Font 2% · 87.2 KiB
Document 1% · 66.9 KiB
Other 0% · 21.1 KiB

~1.1 MiB of savings available

Remove unused JavaScript: 1.1 MiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: private, no-cache, no-store, max-age=0, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private, no-cache, no-store, max-age=0, must-revalidate

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
no-cache—Cache but always revalidate first
no-store—Never cache this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
B
Image Optimization
15 images, 0 KB saveable
REVIEW
15 images, 0 KB saveable
Info::
All images are well-optimized
15 images 1.1 MB
0 oversized -0 KB
10 legacy format
0 missing dimensions CLS risk
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
5 fonts (87 KB)
PASS
5 fonts (87 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

87 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 684 ms LCP 1.7 shttps://static.isu.pub/fonts/inter/v3_19/UcC73FwrK3iLTeHuS_fvQtMwCp50KnMa1ZL7W0Q5nw.woff2UcC73FwrK3iLTeHuS_fvQtM... https://static.isu.pub/fonts/inter/v3_19/UcC73FwrK3iLTeHuS_fvQtMwCp50KnMa1ZL7W0Q5nw.woff2 — 37.4 KiB — 9 ms — font-display: swaphttps://static.isu.pub/fonts/poppins/v4_003/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLEj6Z1x... https://static.isu.pub/fonts/poppins/v4_003/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2 — 8.1 KiB — 4 ms — font-display: swaphttps://static.isu.pub/fonts/poppins/v4_003/pxiByp8kv8JHgFVrLGT9Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLGT9Z1x... https://static.isu.pub/fonts/poppins/v4_003/pxiByp8kv8JHgFVrLGT9Z1xlFd2JQEk.woff2 — 7.8 KiB — 4 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 80 ms — font-display: swaphttps://static.isu.pub/fonts/inter/v3_19/UcC73FwrK3iLTeHuS_fvQtMwCp50KnMa1ZL7W0Q5nw.woff2UcC73FwrK3iLTeHuS_fvQtM... https://static.isu.pub/fonts/inter/v3_19/UcC73FwrK3iLTeHuS_fvQtMwCp50KnMa1ZL7W0Q5nw.woff2 — 0 B — 2 ms — font-display: swap
UcC73FwrK3iLTeHuS_fvQtM... woff2 swap
Size 37 KB
Load time 9 ms
Start 286 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLEj6Z1x... woff2 swap
Size 8 KB
Load time 4 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLGT9Z1x... woff2 swap
Size 8 KB
Load time 4 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 80 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
UcC73FwrK3iLTeHuS_fvQtM... woff2 swap
Size 0 KB
Load time 2 ms
Start 3.4 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)
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
131 requests over 6125ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 684 ms LCP 1.7 shttps://issuu.com// https://issuu.com/ — 200 — 26.8 KiB — 127 ms — h2https://static.issuu.com/fe/silkscreen/0.0.3317/icons/gradient/icon-canva-gradient.svgstatic.issuu.com/fe/silkscreen/0.0.... https://static.issuu.com/fe/silkscreen/0.0.3317/icons/gradient/icon-canva-gradient.svg — 200 — 1.0 KiB — 3 ms — h2https://issuu.com/publisher-space/assets/_next/static/media/CardUseCases.75f310a7.png/publisher-space/assets/_next/stati... https://issuu.com/publisher-space/assets/_next/static/media/CardUseCases.75f310a7.png — 200 — 57.5 KiB — 113 ms — h2https://issuu.com/publisher-space/assets/_next/static/css/b1161f468a5d11d1.css/publisher-space/assets/_next/stati... https://issuu.com/publisher-space/assets/_next/static/css/b1161f468a5d11d1.css — 200 — 457 B — 105 ms — h2https://issuu.com/publisher-space/assets/_next/static/css/d9ebe355f0478b3d.css/publisher-space/assets/_next/stati... https://issuu.com/publisher-space/assets/_next/static/css/d9ebe355f0478b3d.css — 200 — 32.1 KiB — 119 ms — h2https://issuu.com/publisher-space/assets/_next/static/css/ef59b54173bd08e1.css/publisher-space/assets/_next/stati... https://issuu.com/publisher-space/assets/_next/static/css/ef59b54173bd08e1.css — 200 — 275 B — 125 ms — h2https://issuu.com/publisher-space/assets/_next/static/css/dcad5df351a85512.css/publisher-space/assets/_next/stati... https://issuu.com/publisher-space/assets/_next/static/css/dcad5df351a85512.css — 200 — 184 B — 116 ms — h2https://issuu.com/publisher-space/assets/_next/static/css/3e13d5081a368efd.css/publisher-space/assets/_next/stati... https://issuu.com/publisher-space/assets/_next/static/css/3e13d5081a368efd.css — 200 — 1.2 KiB — 108 ms — h2https://consent.cookiebot.com/uc.jsconsent.cookiebot.com/uc.js https://consent.cookiebot.com/uc.js — 200 — 35.7 KiB — 58 ms — h2https://issuu.com/publisher-space/assets/_next/static/chunks/webpack-f6ac98a941319cc4.js/publisher-space/assets/_next/stati... https://issuu.com/publisher-space/assets/_next/static/chunks/webpack-f6ac98a941319cc4.js — 200 — 2.5 KiB — 100 ms — h2https://issuu.com/publisher-space/assets/_next/static/chunks/c976af26-a28c42a4bffb5a8e.js/publisher-space/assets/_next/stati... https://issuu.com/publisher-space/assets/_next/static/chunks/c976af26-a28c42a4bffb5a8e.js — 200 — 53.4 KiB — 187 ms — h2https://issuu.com/publisher-space/assets/_next/static/chunks/2094-7b4cd0add0aa36aa.js/publisher-space/assets/_next/stati... https://issuu.com/publisher-space/assets/_next/static/chunks/2094-7b4cd0add0aa36aa.js — 200 — 44.6 KiB — 162 ms — h2https://issuu.com/publisher-space/assets/_next/static/chunks/main-app-c14c6763d2b00a4c.js/publisher-space/assets/_next/stati... https://issuu.com/publisher-space/assets/_next/static/chunks/main-app-c14c6763d2b00a4c.js — 200 — 1003 B — 112 ms — h2https://issuu.com/publisher-space/assets/_next/static/chunks/2713-b46c819ab27d0274.js/publisher-space/assets/_next/stati... https://issuu.com/publisher-space/assets/_next/static/chunks/2713-b46c819ab27d0274.js — 200 — 10.7 KiB — 176 ms — h2https://issuu.com/publisher-space/assets/_next/static/chunks/4116-5fad51672b1a74e7.js/publisher-space/assets/_next/stati... https://issuu.com/publisher-space/assets/_next/static/chunks/4116-5fad51672b1a74e7.js — 200 — 2.4 KiB — 127 ms — h2https://issuu.com/publisher-space/assets/_next/static/chunks/6124-f72cb1cb1232506f.js/publisher-space/assets/_next/stati... https://issuu.com/publisher-space/assets/_next/static/chunks/6124-f72cb1cb1232506f.js — 200 — 3.4 KiB — 162 ms — h2https://issuu.com/publisher-space/assets/_next/static/chunks/app/global-error-f6770e92c4be6a0f.js/publisher-space/assets/_next/stati... https://issuu.com/publisher-space/assets/_next/static/chunks/app/global-error-f6770e92c4be6a0f.js — 200 — 4.8 KiB — 129 ms — h2https://issuu.com/publisher-space/assets/_next/static/chunks/9244-206c7d79bde1eed2.js/publisher-space/assets/_next/stati... https://issuu.com/publisher-space/assets/_next/static/chunks/9244-206c7d79bde1eed2.js — 200 — 10.4 KiB — 114 ms — h2https://issuu.com/publisher-space/assets/_next/static/chunks/3794-199515601d10ad8a.js/publisher-space/assets/_next/stati... https://issuu.com/publisher-space/assets/_next/static/chunks/3794-199515601d10ad8a.js — 200 — 13.0 KiB — 129 ms — h2data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAFAAAABQCAYAAACOEfKtAAAACXBIWXMAABcRAAAXEQHKJvM/AAAbw…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAFAAAABQCAYAAACOEfKtAAAACXBIWXMAABcRAAAXEQHKJvM/AAAbw… — 200 — 0 B — 0 ms — datahttps://issuu.com/publisher-space/assets/_next/static/chunks/2402-948cec25f70d8fba.js/publisher-space/assets/_next/stati... https://issuu.com/publisher-space/assets/_next/static/chunks/2402-948cec25f70d8fba.js — 200 — 20.8 KiB — 141 ms — h2https://issuu.com/publisher-space/assets/_next/static/chunks/4483-742f60b8e9da509d.js/publisher-space/assets/_next/stati... https://issuu.com/publisher-space/assets/_next/static/chunks/4483-742f60b8e9da509d.js — 200 — 4.0 KiB — 119 ms — h2https://issuu.com/publisher-space/assets/_next/static/chunks/8991-4beae5bdf0180e85.js/publisher-space/assets/_next/stati... https://issuu.com/publisher-space/assets/_next/static/chunks/8991-4beae5bdf0180e85.js — 200 — 16.5 KiB — 178 ms — h2https://issuu.com/publisher-space/assets/_next/static/chunks/7804-89a0f5ecfd34d859.js/publisher-space/assets/_next/stati... https://issuu.com/publisher-space/assets/_next/static/chunks/7804-89a0f5ecfd34d859.js — 200 — 3.8 KiB — 116 ms — h2https://issuu.com/publisher-space/assets/_next/static/chunks/8054-f8abc647fcc2c078.js/publisher-space/assets/_next/stati... https://issuu.com/publisher-space/assets/_next/static/chunks/8054-f8abc647fcc2c078.js — 200 — 3.8 KiB — 103 ms — 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Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
81% of JavaScript execution is third-party
First-party Third-party 1986ms · 1163KB · €22/mo
e.issuu.com
Other
Costly
Execution 701ms
Transfer 169 KB
Unused 45%
Monthly Cost €8/mo
e.issuu.com
Other
Costly
Execution 256ms
Transfer 12 KB
Monthly Cost €3/mo
Unattributable
Other
Costly
Execution 242ms
Transfer 0 KB
Monthly Cost €3/mo
consent.cookiebot.com
Other
Costly
Execution 224ms
Transfer 301 KB
Monthly Cost €2/mo
e.issuu.com
Other
Optional
Execution 181ms
Transfer 169 KB
Unused 27%
Monthly Cost €2/mo
www.gstatic.com
Other
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Execution 149ms
Transfer 0 KB
Unused 49%
Monthly Cost €2/mo
e.issuu.com
Other
Optional
Execution 111ms
Transfer 243 KB
Unused 48%
Monthly Cost €1/mo
consent.cookiebot.com
Other
Optional
Execution 71ms
Transfer 36 KB
Monthly Cost €1/mo
e.issuu.com
Other
Optional
Execution 52ms
Transfer 233 KB
Unused 50%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • e.issuu.com adds 701ms and costs ~€8/month
  • e.issuu.com adds 256ms and costs ~€3/month
  • Unattributable adds 242ms and costs ~€3/month
  • consent.cookiebot.com adds 224ms and costs ~€2/month

81% 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

e.issuu.com takes 701ms 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

e.issuu.com takes 256ms 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 242ms 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

consent.cookiebot.com takes 224ms 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

50% of e.issuu.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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