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https://iflscience.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
80
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.
77
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.

1.34 s

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

2.18 s

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

92 ms

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

0.002

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

2.29 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.

6.16 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
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
3.7 MB transferred, 127 requests
FIX
3.7 MB transferred, 127 requests
Warning::
Page weighs 11.1 MB (3.7 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::
127 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.78 g CO2 per page load
3.7 MB / 2.4 MB budget
3.7 MB transferred
127 requests
0.78 g CO2 per page load
JavaScript 2.6 MiB 71%
Images 751.6 KiB 20%
Fonts 142.1 KiB 4%
HTML 137.3 KiB 4%
CSS 30.0 KiB 1%
Other 26.3 KiB 1%
Other 8.0 KiB 0%
Other 5.7 KiB 0%
Other 1007 B 0%
Other 0 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

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
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
42 scripts, 1.4 MB unused
FIX
42 scripts, 1.4 MB unused
Warning::
https://assets.iflscience.com/2.19.0/base.js: 292 KB unused (81%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://72c64c5a2a0b.f254853b.eu-west-1.token.awsw...: 278 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.taboola.com/libtrc/iflscience-iflscien...: 200 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.intergient.com/prebid/prebid.05eaa3284...: 190 KB unused (86%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 137 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.4 MB
1459 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://assets.iflscience.com/2.19.0/base.js364 KB292 KB (81%)✓3rd
https://72c64c5a2a0b.f254853b.eu-west-1.token.awswaf.com/72c64c5a2a0b/62653e3ff441/ba582facd2bd/challenge.js501 KB278 KB (55%)✓3rd
https://cdn.taboola.com/libtrc/iflscience-iflscience/loader.js320 KB200 KB (63%)✓3rd
https://cdn.intergient.com/prebid/prebid.05eaa3284c60ad6e334d.js222 KB190 KB (86%)✓3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js188 KB137 KB (73%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-F8KM43WG9F&cx=c&gtm=4e64h1154 KB85 KB (55%)✓3rd
https://cdn.iflscience.com/api/tinypass.min.js133 KB79 KB (60%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WXP6H94132 KB63 KB (48%)✓3rd
https://fundingchoicesmessages.google.com/i/154013155?ers=370 KB36 KB (53%)✓3rd
https://js.trendmd.com/widget.js?0.618.069 KB32 KB (46%)✓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
127 resources · 3.7 MB · 1.4 MB savings available
FIX
127 resources · 3.7 MB · 1.4 MB savings available
Warning::
Page weight 2.7 MB over 1MB target
Got: 3.7 MB Expected: ≤ 1 MB
Info::
~1.4 MB of savings available
Warning::
126 third-party resources (100% of weight)
Info::
5 resources over 200KB
127 resources · 3.7 MiB · 126 third-party 2.7 MiB over 1MB target
JavaScript 71% · 2.6 MiB
Image 20% · 753.5 KiB
Font 4% · 142.1 KiB
Document 4% · 137.9 KiB
Other 1% · 38.5 KiB
CSS 1% · 30.0 KiB

~1.4 MiB of savings available

Remove unused JavaScript: 1.4 MiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Image Optimization
44 images, 0 KB saveable
REVIEW
44 images, 0 KB saveable
Info::
All images are well-optimized
44 images 752 KB
0 oversized -0 KB
31 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1248ms total JS execution
REVIEW
1248ms total JS execution
Info::
Unattributable: 213ms CPU time
Info::
https://72c64c5a2a0b.f254853b.eu-west-1.token.awsw...: 171ms CPU time
Info::
https://www.iflscience.com/: 154ms CPU time
Info::
https://fundingchoicesmessages.google.com/f/AGSKWx...: 117ms CPU time
Info::
https://js.hs-analytics.net/analytics/177681720000...: 96ms CPU time
Warning::
Third-party scripts: 1248ms (100% of total)

Main Thread Breakdown

Script Evaluation 61% Other 16% Script Parsing & Compilation 12% Style & Layout 7%
ScriptTotalScriptingParse/CompileParty
Unattributable213ms37ms0ms3rd
https://72c64c5a2a0b.f254853b.eu-west-1.token.awswaf.com/72c64c5a2a0b/62653e3ff441/ba582facd2bd/challenge.js171ms123ms27ms3rd
https://www.iflscience.com/154ms17ms2ms3rd
https://fundingchoicesmessages.google.com/f/AGSKWxUChLKUaLF3qyV1JkZEWouM8jU0zHAQu13EC60gklYHj98mVGeQuPXmUr-fQ-cWtnVmRXGMHi1pibni5t2zNpqWwNJeh9WHgO4ANM4pXVvdl_iFd11Af-KrdwFGhP7HQKEXK7EZlw==?fccs=W251bGwsbnVsbCxudWxsLG51bGwsbnVsbCxudWxsLFsxNzc2ODE3NTI4LDQ2NzAwMDAwMF0sbnVsbCxudWxsLG51bGwsW251bGwsWzddXSwiaHR0cHM6Ly93d3cuaWZsc2NpZW5jZS5jb20vIixudWxsLFtbOCwiRHNLR04tcXFmclEiXSxbOSwiZW4tVVMiXSxbMTgsIltbW251bGwsMTMwMV1dXSJdLFszNSwiMTc3NjgxNzUyOCJdLFsyNiwiMTAiXSxbMTksIjEiXSxbMTcsIlswXSJdLFsyNCwid3d3LmlmbHNjaWVuY2UuY29tIl0sWzI1LCJbWzk1Mzg2MTg5XV0iXSxbMjksImZhbHNlIl1dXQ117ms58ms17ms3rd
https://js.hs-analytics.net/analytics/1776817200000/20033579.js96ms74ms2ms3rd
https://pm-widget.taboola.com/iflscience-iflscience/pmk-20220605.6.js95ms92ms1ms3rd
https://cdn.taboola.com/libtrc/iflscience-iflscience/loader.js88ms60ms28ms3rd
https://assets.iflscience.com/2.19.0/base.js75ms35ms37ms3rd
https://cdn.p-n.io/pushly-sdk.min.js?domain_key=9EUpCFW6OpAmIJsvkgPetN8sOBcsBSqdGfZv72ms62ms4ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js65ms45ms12ms3rd

Showing top 10 of 12 scripts

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 (142 KB)
PASS
5 fonts (142 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

142 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 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.3 s LCP 2.2 shttps://assets.iflscience.com/fonts/Montserrat-Regular-variable.woff2Montserrat-Regular-vari... https://assets.iflscience.com/fonts/Montserrat-Regular-variable.woff2 — 35.2 KiB — 39 ms — font-display: swaphttps://assets.iflscience.com/fonts/Karla-Regular-variable.woff2Karla-Regular-variable.... https://assets.iflscience.com/fonts/Karla-Regular-variable.woff2 — 32.1 KiB — 41 ms — font-display: swaphttps://assets.iflscience.com/fonts/Karla-Italic-variable.woff2Karla-Italic-variable.w... https://assets.iflscience.com/fonts/Karla-Italic-variable.woff2 — 32.7 KiB — 39 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v40/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v40/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 42.1 KiB — 71 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v40/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v40/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 0 B — 71 ms — font-display: swap
Montserrat-Regular-vari... woff2 swap
Size 35 KB
Load time 39 ms
Start 951 ms
Risk FOUT — text flashes from fallback to web font
Karla-Regular-variable.... woff2 swap
Size 32 KB
Load time 41 ms
Start 952 ms
Risk FOUT — text flashes from fallback to web font
Karla-Italic-variable.w... woff2 swap
Size 33 KB
Load time 39 ms
Start 952 ms
Risk FOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 71 ms
Start 2.7 s
Risk FOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 0 KB
Load time 71 ms
Start 2.7 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
127 requests over 4882ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.3 s LCP 2.2 shttps://iflscience.com// https://iflscience.com/ — 301 — 319 B — 8 ms — h2https://www.iflscience.com/www.iflscience.com/ https://www.iflscience.com/ — 202 — 2.8 KiB — 11 ms — h2https://72c64c5a2a0b.f254853b.eu-west-1.token.awswaf.com/72c64c5a2a0b/62653e3ff441/ba582facd2bd/challenge.js72c64c5a2a0b.f254853b.eu-west-1.tok... https://72c64c5a2a0b.f254853b.eu-west-1.token.awswaf.com/72c64c5a2a0b/62653e3ff441/ba582facd2bd/challenge.js — 200 — 501.4 KiB — 336 ms — h2https://72c64c5a2a0b.f254853b.eu-west-1.token.awswaf.com/72c64c5a2a0b/62653e3ff441/ba582facd2bd/inputs?client=browser72c64c5a2a0b.f254853b.eu-west-1.tok... https://72c64c5a2a0b.f254853b.eu-west-1.token.awswaf.com/72c64c5a2a0b/62653e3ff441/ba582facd2bd/inputs?client=browser — 200 — 828 B — 51 ms — h3https://www.iflscience.com/favicon.icowww.iflscience.com/favicon.ico https://www.iflscience.com/favicon.ico — 202 — 477 B — 6 ms — h2https://72c64c5a2a0b.f254853b.eu-west-1.token.awswaf.com/72c64c5a2a0b/62653e3ff441/ba582facd2bd/mp_verify72c64c5a2a0b.f254853b.eu-west-1.tok... https://72c64c5a2a0b.f254853b.eu-west-1.token.awswaf.com/72c64c5a2a0b/62653e3ff441/ba582facd2bd/mp_verify — 200 — 625 B — 145 ms — h3https://72c64c5a2a0b.f254853b.eu-west-1.token.awswaf.com/72c64c5a2a0b/62653e3ff441/ba582facd2bd/mp_verify72c64c5a2a0b.f254853b.eu-west-1.tok... https://72c64c5a2a0b.f254853b.eu-west-1.token.awswaf.com/72c64c5a2a0b/62653e3ff441/ba582facd2bd/mp_verify — 200 — 625 B — 195 ms — h3https://www.iflscience.com/www.iflscience.com/ https://www.iflscience.com/ — 200 — 30.2 KiB — 36 ms — h3https://assets.iflscience.com/fonts/Montserrat-Regular-variable.woff2assets.iflscience.com/fonts/Montser... https://assets.iflscience.com/fonts/Montserrat-Regular-variable.woff2 — 200 — 35.2 KiB — 39 ms — h2https://assets.iflscience.com/fonts/Karla-Regular-variable.woff2assets.iflscience.com/fonts/Karla-R... https://assets.iflscience.com/fonts/Karla-Regular-variable.woff2 — 200 — 32.1 KiB — 41 ms — h2https://assets.iflscience.com/fonts/Karla-Italic-variable.woff2assets.iflscience.com/fonts/Karla-I... https://assets.iflscience.com/fonts/Karla-Italic-variable.woff2 — 200 — 32.7 KiB — 39 ms — h2https://cdn.intergient.com/1025489/75616/ramp.jscdn.intergient.com/1025489/75616/ra... https://cdn.intergient.com/1025489/75616/ramp.js — 200 — 8.1 KiB — 158 ms — h2https://www.iflscience.com/clientUtilities.jswww.iflscience.com/clientUtilities.... https://www.iflscience.com/clientUtilities.js — 200 — 1.1 KiB — 12 ms — h3https://www.iflscience.com/piano.jswww.iflscience.com/piano.js https://www.iflscience.com/piano.js — 200 — 8.2 KiB — 12 ms — h3https://assets.iflscience.com/2.19.0/css/base.cssassets.iflscience.com/2.19.0/css/ba... https://assets.iflscience.com/2.19.0/css/base.css — 200 — 23.4 KiB — 36 ms — h2https://assets.iflscience.com/svg/logo/_logo.svgassets.iflscience.com/svg/logo/_log... https://assets.iflscience.com/svg/logo/_logo.svg — 200 — 2.3 KiB — 21 ms — h2https://assets.iflscience.com/svg/_account.svgassets.iflscience.com/svg/_account.... https://assets.iflscience.com/svg/_account.svg — 200 — 2.1 KiB — 25 ms — h2https://assets.iflscience.com/svg/_exit.svgassets.iflscience.com/svg/_exit.svg https://assets.iflscience.com/svg/_exit.svg — 200 — 1022 B — 24 ms — h2https://assets.iflscience.com/svg/_search.svgassets.iflscience.com/svg/_search.s... https://assets.iflscience.com/svg/_search.svg — 200 — 821 B — 27 ms — h2https://assets.iflscience.com/svg/more-icon-white.svgassets.iflscience.com/svg/more-icon... https://assets.iflscience.com/svg/more-icon-white.svg — 200 — 1.3 KiB — 26 ms — h2https://assets.iflscience.com/svg/_closemore.svgassets.iflscience.com/svg/_closemor... https://assets.iflscience.com/svg/_closemore.svg — 200 — 1.1 KiB — 24 ms — h2https://assets.iflscience.com/svg/label/_space.svgassets.iflscience.com/svg/label/_sp... https://assets.iflscience.com/svg/label/_space.svg — 200 — 1.4 KiB — 31 ms — h2https://assets.iflscience.com/svg/label/_health.svgassets.iflscience.com/svg/label/_he... https://assets.iflscience.com/svg/label/_health.svg — 200 — 1.2 KiB — 17 ms — h2https://assets.iflscience.com/svg/label/_nature.svgassets.iflscience.com/svg/label/_na... https://assets.iflscience.com/svg/label/_nature.svg — 200 — 1.2 KiB — 26 ms — h2https://assets.iflscience.com/svg/label/_humans.svgassets.iflscience.com/svg/label/_hu... https://assets.iflscience.com/svg/label/_humans.svg — 200 — 1.3 KiB — 24 ms — h2https://assets.iflscience.com/svg/label/_technology.svgassets.iflscience.com/svg/label/_te... https://assets.iflscience.com/svg/label/_technology.svg — 200 — 871 B — 17 ms — h2https://assets.iflscience.com/svg/label/_cultureBlack.svgassets.iflscience.com/svg/label/_cu... https://assets.iflscience.com/svg/label/_cultureBlack.svg — 200 — 1.4 KiB — 24 ms — h2https://assets.iflscience.com/icons/bubble-astronaut.pngassets.iflscience.com/icons/bubble-... https://assets.iflscience.com/icons/bubble-astronaut.png — 200 — 997 B — 30 ms — h2https://assets.iflscience.com/2.19.0/site.webmanifestassets.iflscience.com/2.19.0/site.w... https://assets.iflscience.com/2.19.0/site.webmanifest — 200 — 1007 B — 7 ms — h2https://cdn.p-n.io/pushly-sdk.min.js?domain_key=9EUpCFW6OpAmIJsvkgPetN8sOBcsBSqdGfZvcdn.p-n.io/pushly-sdk.min.js?domain... https://cdn.p-n.io/pushly-sdk.min.js?domain_key=9EUpCFW6OpAmIJsvkgPetN8sOBcsBSqdGfZv — 200 — 45.7 KiB — 40 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.3 s LCP 2.2 shttps://iflscience.com// https://iflscience.com/ — 301 — 319 B — 8 ms — h2https://www.iflscience.com/www.iflscience.com/ https://www.iflscience.com/ — 202 — 2.8 KiB — 11 ms — h2https://72c64c5a2a0b.f254853b.eu-west-1.token.awswaf.com/72c64c5a2a0b/62653e3ff441/ba582facd2bd/challenge.js72c64c5a2a0b.f254853b.eu-west-1.tok... https://72c64c5a2a0b.f254853b.eu-west-1.token.awswaf.com/72c64c5a2a0b/62653e3ff441/ba582facd2bd/challenge.js — 200 — 501.4 KiB — 336 ms — h2https://72c64c5a2a0b.f254853b.eu-west-1.token.awswaf.com/72c64c5a2a0b/62653e3ff441/ba582facd2bd/inputs?client=browser72c64c5a2a0b.f254853b.eu-west-1.tok... https://72c64c5a2a0b.f254853b.eu-west-1.token.awswaf.com/72c64c5a2a0b/62653e3ff441/ba582facd2bd/inputs?client=browser — 200 — 828 B — 51 ms — h3https://www.iflscience.com/favicon.icowww.iflscience.com/favicon.ico https://www.iflscience.com/favicon.ico — 202 — 477 B — 6 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 1248ms · 1824KB · $17/mo
Unattributable
Other
Costly
Execution 213ms
Transfer 0 KB
Monthly Cost $3/mo
72c64c5a2a0b.f254853b.eu-west-1.token.awswaf.com
Other
Optional
Execution 171ms
Transfer 501 KB
Unused 55%
Monthly Cost $2/mo
www.iflscience.com
Other
Optional
Execution 154ms
Transfer 30 KB
Monthly Cost $2/mo
fundingchoicesmessages.google.com
Other
Optional
Execution 117ms
Transfer 106 KB
Monthly Cost $2/mo
HubSpot Analytics
Analytics
Optional
Execution 96ms
Transfer 42 KB
Monthly Cost $1/mo
pm-widget.taboola.com
Other
Optional
Execution 95ms
Transfer 24 KB
Monthly Cost $1/mo
cdn.taboola.com
Other
Optional
Execution 88ms
Transfer 320 KB
Unused 63%
Monthly Cost $1/mo
assets.iflscience.com
Other
Optional
Execution 75ms
Transfer 364 KB
Unused 81%
Monthly Cost $1/mo
cdn.p-n.io
Other
Optional
Execution 72ms
Transfer 46 KB
Monthly Cost $1/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 65ms
Transfer 188 KB
Unused 73%
Monthly Cost $1/mo
cdn.iflscience.com
Other
Optional
Execution 51ms
Transfer 133 KB
Unused 60%
Monthly Cost $1/mo
fundingchoicesmessages.google.com
Other
Optional
Execution 50ms
Transfer 70 KB
Unused 53%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 213ms 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.

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

Unattributable takes 213ms 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

55% of 72c64c5a2a0b.f254853b.eu-west-1.token.awswaf.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

63% of cdn.taboola.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

81% of assets.iflscience.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

73% of securepubads.g.doubleclick.net'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

60% of cdn.iflscience.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

53% of fundingchoicesmessages.google.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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