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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
4
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
62
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.
73
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.

605 ms

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

1.75 s

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

472 ms

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

0.059

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

5.68 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.

16.57 s

Page Load Progression

788 ms
1.6 s
2.4 s
3.2 s
3.9 s
4.7 s
5.5 s
6.3 s
Checks
15
8 PASS 1 REVIEW 4 FIX
F
Page Weight Budget
Action
39.3 MB transferred, 214 requests
FIX
39.3 MB transferred, 214 requests
Critical::
Page weighs 46.6 MB (39.3 MB transferred)
Warning::
Images are 36.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 36.4 MB
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::
214 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 8.2 g CO2 per page load
39.3 MB / 2.4 MB budget
39.3 MB transferred
214 requests
8.2 g CO2 per page load
Images 36.4 MiB 93%
JavaScript 2.6 MiB 7%
Fonts 179.6 KiB 0%
HTML 88.5 KiB 0%
Other 26.7 KiB 0%
Other 25.2 KiB 0%
Other 10.2 KiB 0%
CSS 2.5 KiB 0%
Other 622 B 0%
Other 471 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

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

F
JS Execution Cost
Action
5345ms total JS execution
FIX
5345ms total JS execution
Warning::
Unattributable: 1428ms CPU time
Warning::
https://interestingengineering.com/: 889ms CPU time
Warning::
https://interestingengineering.com/_next/static/ch...: 555ms CPU time
Warning::
https://cdn.consentmanager.net/delivery/customdata...: 382ms CPU time
Info::
https://ads.adthrive.com/builds/core/3ec6742/es201...: 207ms CPU time
Warning::
Third-party scripts: 3731ms (70% of total)

Main Thread Breakdown

Script Evaluation 53% Other 25% Style & Layout 9% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
Unattributable1428ms118ms0ms3rd
https://interestingengineering.com/889ms94ms21ms1st
https://interestingengineering.com/_next/static/chunks/107yos3u0uadk.js555ms487ms11ms1st
https://cdn.consentmanager.net/delivery/customdata/bV8xLndfODY2ODUucl9HRFBSLmxfZW4uZF8zNDc0Mi54XzEwMi52LnAudF8zNDc0Mi54dF8xNTA.js382ms354ms4ms3rd
https://ads.adthrive.com/builds/core/3ec6742/es2018/js/adthrive.min.js?deployment=2026-04-21-09:rpsc-834:3ec6742:4&bucket=flex-36&deliveryFeatures=additiveRaptiveFloors,altsdm,altv2,amazonBetaApstag,consentManagerCMP,cv2,dlc,es2021,hb_crid,i262,ld,nvc,ok,pbis,raptiveFloors,raptiveManualCookieSync,recencyFrequency,reissuingSticky,removeAdHost,rpbsecs,rpr,rrassf,stickyBucketsLocalStorage,stickyV2,switzerlandGdpr,trafficShaping,usdk,prebidLoad,gptLoad,amazonLoad,ttdSync&siteid=6661dd7712e1ac035b611f89207ms130ms62ms3rd
https://js.hs-analytics.net/analytics/1776812700000/47062935.js197ms129ms4ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KZVMHRW9191ms164ms21ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js184ms158ms7ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097963170ms142ms23ms3rd
https://www.googletagmanager.com/gtag/js?id=G-7BEHH4VG6K&cx=c&gtm=4e64h1h1167ms126ms24ms3rd

Showing top 10 of 20 scripts

F
JS Bundles
Action
58 scripts, 927 KB unused
FIX
58 scripts, 927 KB unused
Warning::
https://ads.adthrive.com/builds/core/3ec6742/es201...: 160 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 129 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ads.adthrive.com/builds/core/3ec6742/gdpr/...: 126 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-0Y8R...: 68 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-7BEH...: 67 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 927 KB
927 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://ads.adthrive.com/builds/core/3ec6742/es2018/js/adthrive.min.js?deployment=2026-04-21-09:rpsc-834:3ec6742:4&bucket=flex-36&deliveryFeatures=additiveRaptiveFloors,altsdm,altv2,amazonBetaApstag,consentManagerCMP,cv2,dlc,es2021,hb_crid,i262,ld,nvc,ok,pbis,raptiveFloors,raptiveManualCookieSync,recencyFrequency,reissuingSticky,removeAdHost,rpbsecs,rpr,rrassf,stickyBucketsLocalStorage,stickyV2,switzerlandGdpr,trafficShaping,usdk,prebidLoad,gptLoad,amazonLoad,ttdSync&siteid=6661dd7712e1ac035b611f89369 KB160 KB (44%)✓3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097963187 KB129 KB (69%)✓3rd
https://ads.adthrive.com/builds/core/3ec6742/gdpr/vendor/prebid/es2018/prebid.min.js173 KB126 KB (73%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-0Y8RGJWRV7&cx=c&gtm=4e64h1173 KB68 KB (39%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-7BEHH4VG6K&cx=c&gtm=4e64h1h1176 KB67 KB (38%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-674765182&cx=c&gtm=4e64h1h1146 KB61 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WKW2TKP155 KB60 KB (39%)✓3rd
https://interestingengineering.com/_next/static/chunks/119uhjrnv1x.4.js74 KB57 KB (87%)✓1st
https://c.aps.amazon-adsystem.com/apstag.js78 KB50 KB (65%)✓3rd
https://cdn.consentmanager.net/delivery/js/cmp_final.min.js101 KB37 KB (36%)✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

D
Page Weight Inventory
Action
214 resources · 39.3 MB · 927 KB savings available
FIX
214 resources · 39.3 MB · 927 KB savings available
Warning::
Page weight 38.3 MB over 1MB target
Got: 39.3 MB Expected: ≤ 1 MB
Info::
~927 KB of savings available
Info::
80 third-party resources (7% of weight)
Info::
36 resources over 200KB
214 resources · 39.3 MiB · 80 third-party 38.3 MiB over 1MB target
Image 93% · 36.4 MiB
JavaScript 7% · 2.6 MiB
Font 0% · 179.6 KiB
Document 0% · 89.5 KiB
Other 0% · 55.9 KiB
CSS 0% · 2.5 KiB

~926.9 KiB of savings available

Remove unused JavaScript: 926.9 KiB
B
Image Optimization
101 images, 0 KB saveable
REVIEW
101 images, 0 KB saveable
Info::
All images are well-optimized
101 images 36.4 MB
0 oversized -0 KB
95 legacy format
0 missing dimensions CLS risk
A+
Third-Party Impact
7% third-party, 0 ms blocking
PASS
7% third-party, 0 ms blocking
Info::
Third-party code accounts for 7% of page weight (2.9 MiB of 39.3 MiB)
Info::
Third-party blocking time is low (0 ms)
93%
First-party Third-party
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 (180 KB)
PASS
7 fonts (180 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

180 KB total

Render-blocking

0

of 7

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s FCP 605 ms LCP 1.8 shttps://interestingengineering.com/_next/static/media/303804218d80822e-s.p.11p_15xsjt-ie.woff2303804218d80822e-s.p.11... https://interestingengineering.com/_next/static/media/303804218d80822e-s.p.11p_15xsjt-ie.woff2 — 14.8 KiB — 52 ms — font-display: swaphttps://interestingengineering.com/_next/static/media/4f530f52d514af96-s.p.0aapj9pyt9oam.woff24f530f52d514af96-s.p.0a... https://interestingengineering.com/_next/static/media/4f530f52d514af96-s.p.0aapj9pyt9oam.woff2 — 14.6 KiB — 55 ms — font-display: swaphttps://interestingengineering.com/_next/static/media/612838607db3d51d-s.p.0yvdtz6_qans-.woff2612838607db3d51d-s.p.0y... https://interestingengineering.com/_next/static/media/612838607db3d51d-s.p.0yvdtz6_qans-.woff2 — 14.6 KiB — 52 ms — font-display: swaphttps://interestingengineering.com/_next/static/media/83afe278b6a6bb3c-s.p.0q-301v4kxxnr.woff283afe278b6a6bb3c-s.p.0q... https://interestingengineering.com/_next/static/media/83afe278b6a6bb3c-s.p.0q-301v4kxxnr.woff2 — 47.6 KiB — 54 ms — font-display: swaphttps://interestingengineering.com/_next/static/media/b4e85636e2ca4056-s.p.0c3c6tp9xl371.woff2b4e85636e2ca4056-s.p.0c... https://interestingengineering.com/_next/static/media/b4e85636e2ca4056-s.p.0c3c6tp9xl371.woff2 — 36.1 KiB — 55 ms — font-display: swaphttps://interestingengineering.com/_next/static/media/ce62453a442c7f35-s.p.0333ktddfbsxy.woff2ce62453a442c7f35-s.p.03... https://interestingengineering.com/_next/static/media/ce62453a442c7f35-s.p.0333ktddfbsxy.woff2 — 37.0 KiB — 53 ms — font-display: swaphttps://interestingengineering.com/_next/static/media/d9b5d46d9a89ffe6-s.p.0agk34fg-1.z0.woff2d9b5d46d9a89ffe6-s.p.0a... https://interestingengineering.com/_next/static/media/d9b5d46d9a89ffe6-s.p.0agk34fg-1.z0.woff2 — 14.8 KiB — 55 ms — font-display: swap
303804218d80822e-s.p.11... woff2 swap
Size 15 KB
Load time 52 ms
Start 67 ms
Risk FOUT — text flashes from fallback to web font
4f530f52d514af96-s.p.0a... woff2 swap
Size 15 KB
Load time 55 ms
Start 67 ms
Risk FOUT — text flashes from fallback to web font
612838607db3d51d-s.p.0y... woff2 swap
Size 15 KB
Load time 52 ms
Start 68 ms
Risk FOUT — text flashes from fallback to web font
83afe278b6a6bb3c-s.p.0q... woff2 swap
Size 48 KB
Load time 54 ms
Start 68 ms
Risk FOUT — text flashes from fallback to web font
b4e85636e2ca4056-s.p.0c... woff2 swap
Size 36 KB
Load time 55 ms
Start 68 ms
Risk FOUT — text flashes from fallback to web font
ce62453a442c7f35-s.p.03... woff2 swap
Size 37 KB
Load time 53 ms
Start 69 ms
Risk FOUT — text flashes from fallback to web font
d9b5d46d9a89ffe6-s.p.0a... woff2 swap
Size 15 KB
Load time 55 ms
Start 69 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

A
HTTP Caching
max-age=300 (5 minutes)
PASS
max-age=300 (5 minutes)
Info::
Cache-Control header is set
Got: public, max-age=300, must-revalidate
Info::
Effective TTL: 5 minutes (max-age=300)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=300, must-revalidate

DirectiveValueMeaning
public—Any cache may store this response
max-age300Cache for 5 minutes
must-revalidate—Must recheck with server after expiry
Effective TTL: 300 seconds
Network Waterfall
214 requests over 6777ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 605 ms LCP 1.8 shttps://interestingengineering.com// https://interestingengineering.com/ — 200 — 88.5 KiB — 59 ms — h3https://interestingengineering.com/cdn-cgi/speculation/cdn-cgi/speculation https://interestingengineering.com/cdn-cgi/speculation — 200 — 293 B — 10 ms — h3https://interestingengineering.com/_next/static/media/303804218d80822e-s.p.11p_15xsjt-ie.woff2/_next/static/media/303804218d80822... https://interestingengineering.com/_next/static/media/303804218d80822e-s.p.11p_15xsjt-ie.woff2 — 200 — 14.8 KiB — 52 ms — h3https://interestingengineering.com/_next/static/media/4f530f52d514af96-s.p.0aapj9pyt9oam.woff2/_next/static/media/4f530f52d514af9... https://interestingengineering.com/_next/static/media/4f530f52d514af96-s.p.0aapj9pyt9oam.woff2 — 200 — 14.6 KiB — 55 ms — h3https://interestingengineering.com/_next/static/media/612838607db3d51d-s.p.0yvdtz6_qans-.woff2/_next/static/media/612838607db3d51... https://interestingengineering.com/_next/static/media/612838607db3d51d-s.p.0yvdtz6_qans-.woff2 — 200 — 14.6 KiB — 52 ms — h3https://interestingengineering.com/_next/static/media/83afe278b6a6bb3c-s.p.0q-301v4kxxnr.woff2/_next/static/media/83afe278b6a6bb3... https://interestingengineering.com/_next/static/media/83afe278b6a6bb3c-s.p.0q-301v4kxxnr.woff2 — 200 — 47.6 KiB — 54 ms — h3https://interestingengineering.com/_next/static/media/b4e85636e2ca4056-s.p.0c3c6tp9xl371.woff2/_next/static/media/b4e85636e2ca405... https://interestingengineering.com/_next/static/media/b4e85636e2ca4056-s.p.0c3c6tp9xl371.woff2 — 200 — 36.1 KiB — 55 ms — h3https://interestingengineering.com/_next/static/media/ce62453a442c7f35-s.p.0333ktddfbsxy.woff2/_next/static/media/ce62453a442c7f3... https://interestingengineering.com/_next/static/media/ce62453a442c7f35-s.p.0333ktddfbsxy.woff2 — 200 — 37.0 KiB — 53 ms — h3https://interestingengineering.com/_next/static/media/d9b5d46d9a89ffe6-s.p.0agk34fg-1.z0.woff2/_next/static/media/d9b5d46d9a89ffe... https://interestingengineering.com/_next/static/media/d9b5d46d9a89ffe6-s.p.0agk34fg-1.z0.woff2 — 200 — 14.8 KiB — 55 ms — h3https://interestingengineering.com/_next/static/chunks/0skwb7st_o0_z.css/_next/static/chunks/0skwb7st_o0_z.... https://interestingengineering.com/_next/static/chunks/0skwb7st_o0_z.css — 200 — 0 B — 19 ms — h3https://interestingengineering.com/_next/static/chunks/0dgx0vtj.doyr.css/_next/static/chunks/0dgx0vtj.doyr.... https://interestingengineering.com/_next/static/chunks/0dgx0vtj.doyr.css — 200 — 0 B — 44 ms — h3https://interestingengineering.com/_next/static/chunks/06muz3cuqvof0.css/_next/static/chunks/06muz3cuqvof0.... https://interestingengineering.com/_next/static/chunks/06muz3cuqvof0.css — 200 — 0 B — 61 ms — h3https://interestingengineering.com/_next/static/chunks/0aw812u54betd.css/_next/static/chunks/0aw812u54betd.... https://interestingengineering.com/_next/static/chunks/0aw812u54betd.css — 200 — 0 B — 48 ms — h3https://interestingengineering.com/_next/static/chunks/0su25478~5qk5.css/_next/static/chunks/0su25478~5qk5.... https://interestingengineering.com/_next/static/chunks/0su25478~5qk5.css — 200 — 0 B — 50 ms — h3https://interestingengineering.com/_next/static/chunks/0p8ac14s1nrf9.css/_next/static/chunks/0p8ac14s1nrf9.... https://interestingengineering.com/_next/static/chunks/0p8ac14s1nrf9.css — 200 — 0 B — 54 ms — h3https://interestingengineering.com/_next/image?url=https%3A%2F%2Fcms.interestingengineering.com%2Fwp-content%2Fuploads%2F2026%2F04%2FIE-Photo-71-1.jpg&w=1920&q=75/_next/image?url=https%3A%2F%2Fcms.... https://interestingengineering.com/_next/image?url=https%3A%2F%2Fcms.interestingengineering.com%2Fwp-content%2Fuploads%2F2026%2F04%2FIE-Photo-71-1.jpg&w=1920&q=75 — 200 — 216.4 KiB — 97 ms — h3https://interestingengineering.com/_next/image?url=https%3A%2F%2Fcms.interestingengineering.com%2Fwp-content%2Fuploads%2F2026%2F04%2FIE-Photo-71-1.jpg&w=640&q=75/_next/image?url=https%3A%2F%2Fcms.... https://interestingengineering.com/_next/image?url=https%3A%2F%2Fcms.interestingengineering.com%2Fwp-content%2Fuploads%2F2026%2F04%2FIE-Photo-71-1.jpg&w=640&q=75 — 200 — 216.4 KiB — 115 ms — h3https://interestingengineering.com/_next/static/chunks/0u4xrb4e05ypi.css/_next/static/chunks/0u4xrb4e05ypi.... https://interestingengineering.com/_next/static/chunks/0u4xrb4e05ypi.css — 200 — 1.5 KiB — 41 ms — h3https://cdn.p-n.io/pushly-sdk.min.js?domain_key=2lGk6df1rSYyOtl0K802tDONHmW3wgIpo68Zcdn.p-n.io/pushly-sdk.min.js?domain... https://cdn.p-n.io/pushly-sdk.min.js?domain_key=2lGk6df1rSYyOtl0K802tDONHmW3wgIpo68Z — 200 — 45.9 KiB — 79 ms — h2https://interestingengineering.com/js/recovery.js/js/recovery.js https://interestingengineering.com/js/recovery.js — 200 — 3.9 KiB — 342 ms — h3https://interestingengineering.com/js/gapw-init.js/js/gapw-init.js https://interestingengineering.com/js/gapw-init.js — 200 — 2.1 KiB — 388 ms — h3https://experiments.parsely.com/vip-experiments.js?apiKey=interestingengineering.comexperiments.parsely.com/vip-experim... https://experiments.parsely.com/vip-experiments.js?apiKey=interestingengineering.com — 200 — 8.9 KiB — 67 ms — h2https://interestingengineering.com/_next/image?url=https%3A%2F%2Fcms.interestingengineering.com%2Fwp-content%2Fuploads%2F2026%2F04%2FIE-64.jpg&w=384&q=75/_next/image?url=https%3A%2F%2Fcms.... https://interestingengineering.com/_next/image?url=https%3A%2F%2Fcms.interestingengineering.com%2Fwp-content%2Fuploads%2F2026%2F04%2FIE-64.jpg&w=384&q=75 — 200 — 177.3 KiB — 101 ms — h3https://interestingengineering.com/_next/image?url=https%3A%2F%2Fcms.interestingengineering.com%2Fwp-content%2Fuploads%2F2026%2F04%2FNorthrop.png&w=384&q=75/_next/image?url=https%3A%2F%2Fcms.... 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https://forms.hsforms.com/embed/v3/counters.gif?key=collected-forms-embed-js-form-bind&count=3 — 200 — 539 B — 128 ms — h3https://px.ads.linkedin.com/wa/?medium=fetch&fmt=gpx.ads.linkedin.com/wa/?medium=fetc... https://px.ads.linkedin.com/wa/?medium=fetch&fmt=g — 204 — 597 B — 235 ms — h2https://h.clarity.ms/collecth.clarity.ms/collect https://h.clarity.ms/collect — 204 — 290 B — 280 ms — http/1.1https://ads.adthrive.com/http-api/cv2ads.adthrive.com/http-api/cv2 https://ads.adthrive.com/http-api/cv2 — 200 — 4.6 KiB — 6 ms — h2https://b.delivery.consentmanager.net/delivery/cmp.php?&cdid=aa95c00731726&h=https%3A%2F%2Finterestingengineering.com%2F&&__cmpfcc=1&l=en&ls=EN_EN_EN&lp=EN&o=1776812827459b.delivery.consentmanager.net/deliv... https://b.delivery.consentmanager.net/delivery/cmp.php?&cdid=aa95c00731726&h=https%3A%2F%2Finterestingengineering.com%2F&&__cmpfcc=1&l=en&ls=EN_EN_EN&lp=EN&o=1776812827459 — 200 — 2.7 KiB — 78 ms — h2https://cdn.consentmanager.net/delivery/js/cmp_final.min.jscdn.consentmanager.net/delivery/js/... https://cdn.consentmanager.net/delivery/js/cmp_final.min.js — 200 — 100.8 KiB — 62 ms — h2https://ads.adthrive.com/api/v1/marmalade?siteid=6661dd7712e1ac035b611f89&url=https%3A%2F%2Finterestingengineering.com%2F&deliveryFeatures=additiveRaptiveFloors,altsdm,altv2,amazonBetaApstag,consentManagerCMP,cv2,dlc,es2021,hb_crid,i262,ld,nvc,ok,pbis,raptiveFloors,raptiveManualCookieSync,recencyFrequency,reissuingSticky,removeAdHost,rpbsecs,rpr,rrassf,stickyBucketsLocalStorage,stickyV2,switzerlandGdpr,trafficShaping,usdk,prebidLoad,gptLoad,amazonLoad,ttdSyncads.adthrive.com/api/v1/marmalade?s... https://ads.adthrive.com/api/v1/marmalade?siteid=6661dd7712e1ac035b611f89&url=https%3A%2F%2Finterestingengineering.com%2F&deliveryFeatures=additiveRaptiveFloors,altsdm,altv2,amazonBetaApstag,consentManagerCMP,cv2,dlc,es2021,hb_crid,i262,ld,nvc,ok,pbis,raptiveFloors,raptiveManualCookieSync,recencyFrequency,reissuingSticky,removeAdHost,rpbsecs,rpr,rrassf,stickyBucketsLocalStorage,stickyV2,switzerlandGdpr,trafficShaping,usdk,prebidLoad,gptLoad,amazonLoad,ttdSync — 200 — 2.7 KiB — 499 ms — h2https://c.aps.amazon-adsystem.com/apstag.jsc.aps.amazon-adsystem.com/apstag.js https://c.aps.amazon-adsystem.com/apstag.js — 200 — 78.4 KiB — 74 ms — h2https://securepubads.g.doubleclick.net/tag/js/gpt.jssecurepubads.g.doubleclick.net/tag/... https://securepubads.g.doubleclick.net/tag/js/gpt.js — 200 — 33.9 KiB — 71 ms — h3https://ads.adthrive.com/builds/core/3ec6742/gdpr/vendor/prebid/es2018/prebid.min.jsads.adthrive.com/builds/core/3ec674... 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https://eu-us.consentmanager.net/delivery/info/?id=86685&did=2&cfdid=30246&t=pv.d_ncs.d_ancs.d_bncs.cf.cfx.cv&h=https%3A%2F%2Finterestingengineering.com%2F&o=1776812828066&l=EN&lv=103409&d=2&ct=14&e=&e2=&e3=&i=&sv=150&dv=102& — 200 — 326 B — 60 ms — h2https://eu-us-cdn.consentmanager.net/delivery/flags/en.gifeu-us-cdn.consentmanager.net/delive... https://eu-us-cdn.consentmanager.net/delivery/flags/en.gif — 200 — 818 B — 17 ms — h2https://cdn.jwplayer.com/v2/playlists/4AtaGiKZ?max_resolution=1280cdn.jwplayer.com/v2/playlists/4AtaG... https://cdn.jwplayer.com/v2/playlists/4AtaGiKZ?max_resolution=1280 — 200 — 4.6 KiB — 526 ms — h2https://gum.criteo.com/sid/json?origin=prebid&topUrl=https%3A%2F%2Finterestingengineering.com%2F&domain=interestingengineering.com&cw=1&lsw=1gum.criteo.com/sid/json?origin=preb... https://gum.criteo.com/sid/json?origin=prebid&topUrl=https%3A%2F%2Finterestingengineering.com%2F&domain=interestingengineering.com&cw=1&lsw=1 — 200 — 0 B — 22 ms — h2https://id.crwdcntrl.net/id?c=17297id.crwdcntrl.net/id?c=17297 https://id.crwdcntrl.net/id?c=17297 — 200 — 327 B — 86 ms — h2https://at.teads.tv/fpc?analytics_tag_id=PUB_17002&tfpvi=&gdpr_consent=&gdpr_status=22&gdpr_reason=220&ccpa_consent=&sv=prebid-v1at.teads.tv/fpc?analytics_tag_id=PU... https://at.teads.tv/fpc?analytics_tag_id=PUB_17002&tfpvi=&gdpr_consent=&gdpr_status=22&gdpr_reason=220&ccpa_consent=&sv=prebid-v1 — 200 — 432 B — 44 ms — h2https://gum.criteo.com/sid/json?origin=prebid&topUrl=https%3A%2F%2Finterestingengineering.com%2F&domain=interestingengineering.com&cw=1&lsw=1gum.criteo.com/sid/json?origin=preb... https://gum.criteo.com/sid/json?origin=prebid&topUrl=https%3A%2F%2Finterestingengineering.com%2F&domain=interestingengineering.com&cw=1&lsw=1 — 200 — 385 B — 9 ms — h2https://ads.adthrive.com/sites/6661dd7712e1ac035b611f89/ads.min.cssads.adthrive.com/sites/6661dd7712e1... https://ads.adthrive.com/sites/6661dd7712e1ac035b611f89/ads.min.css — 200 — 1007 B — 6 ms — 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h2https://region1.analytics.google.com/g/collect?v=2&tid=G-7BEHH4VG6K&gtm=45je64h1h1v9178695854z8890886228za20gzb890886228zd890886228&_p=1776812823414&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&ecid=174334204&_eu=AAAAAGQ&are=1&cid=1637218947.1776812827&frm=0&pscdl=noapi&rcb=11&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&gaf=2&_s=2&tag_exp=0~115938465~115938468~117266400~117512543~118167059&sid=1776812826&sct=1&seg=0&dl=https%3A%2F%2Finterestingengineering.com%2F&dt=Interesting%20Engineering%20%7C%20Engineering%2C%20Tech%20and%20Science%20News&en=page_load_time&epn.loading_time_sec=2.42&_et=13&tfd=5959region1.analytics.google.com/g/coll... 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h3https://region1.google-analytics.com/g/collect?v=2&tid=G-7BEHH4VG6K&gtm=45je64h1h1v9178695854z8890886228za20gzb890886228zd890886228&_p=1776812823414&gcs=G100&gcd=13p3p3p2p5l1&npa=1&dma_cps=-&dma=1&tcfd=1000h&gdid=dMzk4MW&ecid=831770020&_eu=AAAAAGA&are=1&cid=990521310.1776812829&frm=0&pscdl=denied&rcb=11&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&gaf=2&_s=3&tag_exp=0~115938465~115938468~117266400~117512543~118167059&dp=%2F&sid=1776812828&sct=1&seg=0&dl=https%3A%2F%2Finterestingengineering.com%2F&dt=Interesting%20Engineering%20%7C%20Engineering%2C%20Tech%20and%20Science%20News&en=ad_blocker_detection&_fv=1&_nsi=1&_ss=1&ep.category=Ad%20Blocker&ep.action=Not%20Detected&ep.label=%2F&ep.ad_block_status=disabled&tfd=5960region1.google-analytics.com/g/coll... 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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
70% of JavaScript execution is third-party
First-party Third-party 3731ms · 1750KB · €40/mo
Unattributable
Other
Costly
Execution 1428ms
Transfer 0 KB
Monthly Cost €16/mo
cdn.consentmanager.net
Other
Costly
Execution 382ms
Transfer 22 KB
Monthly Cost €4/mo
ads.adthrive.com
Other
Costly
Execution 207ms
Transfer 369 KB
Unused 44%
Monthly Cost €2/mo
HubSpot Analytics
Analytics
Optional
Execution 197ms
Transfer 42 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 191ms
Transfer 136 KB
Unused 40%
Monthly Cost €2/mo
Microsoft Clarity
Session Replay
Optional
Execution 184ms
Transfer 26 KB
Monthly Cost €2/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 170ms
Transfer 187 KB
Unused 69%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 167ms
Transfer 176 KB
Unused 38%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 141ms
Transfer 173 KB
Unused 39%
Monthly Cost €2/mo
cdn.p-n.io
Other
Optional
Execution 141ms
Transfer 46 KB
Monthly Cost €2/mo
ads.adthrive.com
Other
Optional
Execution 123ms
Transfer 34 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 121ms
Transfer 146 KB
Unused 42%
Monthly Cost €1/mo
ads.adthrive.com
Other
Optional
Execution 107ms
Transfer 173 KB
Unused 73%
Monthly Cost €1/mo
Facebook Pixel
Advertising
Optional
Execution 60ms
Transfer 45 KB
Monthly Cost €1/mo
Facebook Pixel
Advertising
Optional
Execution 58ms
Transfer 97 KB
Unused 35%
Monthly Cost €1/mo
c.aps.amazon-adsystem.com
Other
Optional
Execution 55ms
Transfer 78 KB
Unused 65%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 1428ms and costs ~€16/month
  • cdn.consentmanager.net adds 382ms and costs ~€4/month
  • ads.adthrive.com adds 207ms and costs ~€2/month

70% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 1428ms 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.consentmanager.net takes 382ms 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

ads.adthrive.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

69% 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

73% of ads.adthrive.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

65% of c.aps.amazon-adsystem.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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