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https://iflscience.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
28
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

13.84 s

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

26.87 s

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

1.69 s

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

0.026

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

13.84 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.

28.03 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 2 REVIEW 6 FIX
F
Page Weight Budget
Action
3.5 MB transferred, 120 requests
FIX
3.5 MB transferred, 120 requests
Warning::
Page weighs 11.0 MB (3.5 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::
120 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.74 g CO2 per page load
3.5 MB / 2.4 MB budget
3.5 MB transferred
120 requests
0.74 g CO2 per page load
JavaScript 2.6 MiB 74%
Images 578.2 KiB 16%
Fonts 142.1 KiB 4%
HTML 137.3 KiB 4%
CSS 30.1 KiB 1%
Other 26.3 KiB 1%
Other 8.0 KiB 0%
Other 5.8 KiB 0%
Other 1004 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 (3.5 MiB of 3.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
8154ms total JS execution
FIX
8154ms total JS execution
Warning::
https://fundingchoicesmessages.google.com/f/AGSKWx...: 2120ms CPU time
Warning::
Unattributable: 1014ms CPU time
Warning::
https://72c64c5a2a0b.f254853b.eu-west-1.token.awsw...: 691ms CPU time
Warning::
https://pm-widget.taboola.com/iflscience-iflscienc...: 551ms CPU time
Warning::
https://js.hs-analytics.net/analytics/177681720000...: 429ms CPU time
Warning::
Third-party scripts: 8154ms (100% of total)

Main Thread Breakdown

Script Evaluation 70% Other 12% Script Parsing & Compilation 9% Style & Layout 5%
ScriptTotalScriptingParse/CompileParty
https://fundingchoicesmessages.google.com/f/AGSKWxXWBrkZUSFlCt6wuJBZsCKdHUsAoxcTTY7zF4VBKPkeykUTpv0aDJRQ-yZGE2N7tYc95M43X0mfdPuNQUekEKogMIhBhBH3xKMw490o7fmOHdhzPcTQjYPjYi3DTXAFcju767mPcA==?fccs=W251bGwsbnVsbCxudWxsLG51bGwsbnVsbCxudWxsLFsxNzc2ODE3NDk1LDU4MDAwMDAwXSxudWxsLG51bGwsbnVsbCxbbnVsbCxbN11dLCJodHRwczovL3d3dy5pZmxzY2llbmNlLmNvbS8iLG51bGwsW1s4LCJEc0tHTi1xcWZyUSJdLFs5LCJlbi1VUyJdLFsxOCwiW1tbbnVsbCwxNDY3XV1dIl0sWzM1LCIxNzc2ODE3NDk1Il0sWzE5LCIxIl0sWzE3LCJbMF0iXSxbMjQsInd3dy5pZmxzY2llbmNlLmNvbSJdLFsyOSwiZmFsc2UiXV1d2120ms1831ms76ms3rd
Unattributable1014ms238ms0ms3rd
https://72c64c5a2a0b.f254853b.eu-west-1.token.awswaf.com/72c64c5a2a0b/62653e3ff441/ba582facd2bd/challenge.js691ms486ms125ms3rd
https://pm-widget.taboola.com/iflscience-iflscience/pmk-20220605.6.js551ms541ms7ms3rd
https://js.hs-analytics.net/analytics/1776817200000/20033579.js429ms340ms7ms3rd
https://cdn.p-n.io/pushly-sdk.min.js?domain_key=9EUpCFW6OpAmIJsvkgPetN8sOBcsBSqdGfZv329ms281ms20ms3rd
https://assets.iflscience.com/2.19.0/base.js302ms150ms135ms3rd
https://cdn.taboola.com/libtrc/iflscience-iflscience/loader.js300ms175ms123ms3rd
https://fundingchoicesmessages.google.com/i/154013155?ers=3245ms224ms16ms3rd
https://cdn.intergient.com/prebid/prebid.05eaa3284c60ad6e334d.js212ms145ms65ms3rd

Showing top 10 of 24 scripts

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...: 139 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.4 MB
1461 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 KB139 KB (74%)✓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
120 resources · 3.5 MB · 1.4 MB savings available
FIX
120 resources · 3.5 MB · 1.4 MB savings available
Warning::
Page weight 2.5 MB over 1MB target
Got: 3.5 MB Expected: ≤ 1 MB
Info::
~1.4 MB of savings available
Warning::
119 third-party resources (100% of weight)
Info::
5 resources over 200KB
120 resources · 3.5 MiB · 119 third-party 2.5 MiB over 1MB target
JavaScript 74% · 2.6 MiB
Image 16% · 580.1 KiB
Font 4% · 142.1 KiB
Document 4% · 137.9 KiB
Other 1% · 38.6 KiB
CSS 1% · 30.1 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
37 images, 0 KB saveable
REVIEW
37 images, 0 KB saveable
Info::
All images are well-optimized
37 images 578 KB
0 oversized -0 KB
31 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 (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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s FCP 13.8 s LCP 26.9 shttps://assets.iflscience.com/fonts/Montserrat-Regular-variable.woff2Montserrat-Regular-vari... https://assets.iflscience.com/fonts/Montserrat-Regular-variable.woff2 — 35.2 KiB — 67 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 — 66 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 — 67 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 — 70 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 — 70 ms — font-display: swap
Montserrat-Regular-vari... woff2 swap
Size 35 KB
Load time 67 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
Karla-Regular-variable.... woff2 swap
Size 32 KB
Load time 66 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
Karla-Italic-variable.w... woff2 swap
Size 33 KB
Load time 67 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 70 ms
Start 3.4 s
Risk FOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 0 KB
Load time 70 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
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
120 requests over 5328ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s FCP 13.8 s LCP 26.9 shttps://iflscience.com// https://iflscience.com/ — 301 — 317 B — 12 ms — h2https://www.iflscience.com/www.iflscience.com/ https://www.iflscience.com/ — 202 — 2.8 KiB — 16 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 — 430 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 — 123 ms — h3https://www.iflscience.com/favicon.icowww.iflscience.com/favicon.ico https://www.iflscience.com/favicon.ico — 202 — 478 B — 7 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 — 638 B — 209 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 — 637 B — 213 ms — h3https://www.iflscience.com/www.iflscience.com/ https://www.iflscience.com/ — 200 — 30.2 KiB — 145 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 — 67 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 — 66 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 — 67 ms — h2https://cdn.intergient.com/1025489/75616/ramp.jscdn.intergient.com/1025489/75616/ra... https://cdn.intergient.com/1025489/75616/ramp.js — 200 — 8.0 KiB — 162 ms — h2https://www.iflscience.com/clientUtilities.jswww.iflscience.com/clientUtilities.... https://www.iflscience.com/clientUtilities.js — 200 — 1.1 KiB — 119 ms — h3https://www.iflscience.com/piano.jswww.iflscience.com/piano.js https://www.iflscience.com/piano.js — 200 — 8.2 KiB — 116 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 — 48 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 — 43 ms — h2https://assets.iflscience.com/svg/_account.svgassets.iflscience.com/svg/_account.... https://assets.iflscience.com/svg/_account.svg — 200 — 2.1 KiB — 56 ms — h2https://assets.iflscience.com/svg/_exit.svgassets.iflscience.com/svg/_exit.svg https://assets.iflscience.com/svg/_exit.svg — 200 — 1021 B — 53 ms — h2https://assets.iflscience.com/svg/_search.svgassets.iflscience.com/svg/_search.s... https://assets.iflscience.com/svg/_search.svg — 200 — 821 B — 61 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 — 57 ms — h2https://assets.iflscience.com/svg/_closemore.svgassets.iflscience.com/svg/_closemor... https://assets.iflscience.com/svg/_closemore.svg — 200 — 1.1 KiB — 54 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 — 49 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 — 62 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 — 58 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 — 56 ms — h2https://assets.iflscience.com/svg/label/_technology.svgassets.iflscience.com/svg/label/_te... https://assets.iflscience.com/svg/label/_technology.svg — 200 — 870 B — 49 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 — 61 ms — h2https://assets.iflscience.com/icons/bubble-astronaut.pngassets.iflscience.com/icons/bubble-... https://assets.iflscience.com/icons/bubble-astronaut.png — 200 — 998 B — 59 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 — 59 ms — h2https://cdnjs.cloudflare.com/ajax/libs/dayjs/1.11.6/dayjs.min.jscdnjs.cloudflare.com/ajax/libs/dayj... https://cdnjs.cloudflare.com/ajax/libs/dayjs/1.11.6/dayjs.min.js — 200 — 3.3 KiB — 84 ms — h3
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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 8154ms · 2563KB · $108/mo
fundingchoicesmessages.google.com
Other
Costly
Execution 2120ms
Transfer 106 KB
Monthly Cost $28/mo
Unattributable
Other
Costly
Execution 1014ms
Transfer 0 KB
Monthly Cost $13/mo
72c64c5a2a0b.f254853b.eu-west-1.token.awswaf.com
Other
Costly
Execution 691ms
Transfer 501 KB
Unused 55%
Monthly Cost $9/mo
pm-widget.taboola.com
Other
Costly
Execution 551ms
Transfer 24 KB
Monthly Cost $7/mo
HubSpot Analytics
Analytics
Costly
Execution 429ms
Transfer 42 KB
Monthly Cost $6/mo
cdn.p-n.io
Other
Costly
Execution 329ms
Transfer 46 KB
Monthly Cost $4/mo
assets.iflscience.com
Other
Costly
Execution 302ms
Transfer 364 KB
Unused 81%
Monthly Cost $4/mo
cdn.taboola.com
Other
Costly
Execution 300ms
Transfer 320 KB
Unused 63%
Monthly Cost $4/mo
fundingchoicesmessages.google.com
Other
Costly
Execution 245ms
Transfer 70 KB
Unused 53%
Monthly Cost $3/mo
cdn.intergient.com
Other
Costly
Execution 212ms
Transfer 222 KB
Unused 86%
Monthly Cost $3/mo
cdn.iflscience.com
Other
Costly
Execution 207ms
Transfer 133 KB
Unused 60%
Monthly Cost $3/mo
cdn.cxense.com
Other
Costly
Execution 203ms
Transfer 38 KB
Unused 58%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 200ms
Transfer 132 KB
Unused 48%
Monthly Cost $3/mo
www.iflscience.com
Other
Optional
Execution 198ms
Transfer 30 KB
Monthly Cost $3/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 179ms
Transfer 188 KB
Unused 74%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 148ms
Transfer 154 KB
Unused 55%
Monthly Cost $2/mo
Twitter/X Embed
Social
Optional
Execution 146ms
Transfer 27 KB
Monthly Cost $2/mo
js.trendmd.com
Other
Optional
Execution 142ms
Transfer 69 KB
Unused 46%
Monthly Cost $2/mo
auth.iflscience.com
Other
Optional
Execution 122ms
Transfer 1 KB
Monthly Cost $2/mo
www.npttech.com
Other
Optional
Execution 106ms
Transfer 3 KB
Monthly Cost $1/mo
js.trendmd.com
Other
Optional
Execution 93ms
Transfer 4 KB
Monthly Cost $1/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 84ms
Transfer 34 KB
Monthly Cost $1/mo
js.hubspot.com
Other
Optional
Execution 67ms
Transfer 28 KB
Monthly Cost $1/mo
js.hscollectedforms.net
Other
Optional
Execution 64ms
Transfer 26 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • fundingchoicesmessages.google.com adds 2120ms and costs ~$28/month
  • Unattributable adds 1014ms and costs ~$13/month
  • 72c64c5a2a0b.f254853b.eu-west-1.token.awswaf.com adds 691ms and costs ~$9/month
  • pm-widget.taboola.com adds 551ms and costs ~$7/month
  • HubSpot Analytics adds 429ms and costs ~$6/month
  • cdn.p-n.io adds 329ms and costs ~$4/month
  • assets.iflscience.com adds 302ms and costs ~$4/month
  • cdn.taboola.com adds 300ms and costs ~$4/month
  • fundingchoicesmessages.google.com adds 245ms and costs ~$3/month
  • cdn.intergient.com adds 212ms and costs ~$3/month
  • cdn.iflscience.com adds 207ms and costs ~$3/month
  • cdn.cxense.com adds 203ms and costs ~$3/month
  • Google Tag Manager adds 200ms 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

fundingchoicesmessages.google.com takes 2120ms 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 1014ms 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

72c64c5a2a0b.f254853b.eu-west-1.token.awswaf.com takes 691ms 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

pm-widget.taboola.com takes 551ms 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

HubSpot Analytics takes 429ms 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.p-n.io takes 329ms 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

assets.iflscience.com takes 302ms 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

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

cdn.taboola.com takes 300ms 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.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

fundingchoicesmessages.google.com takes 245ms 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

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

cdn.intergient.com takes 212ms 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

86% of cdn.intergient.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

cdn.iflscience.com takes 207ms 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

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

cdn.cxense.com takes 203ms 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

58% of cdn.cxense.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 200ms 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

74% 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

55% of Google Tag Manager'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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