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https://backlinko.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
3
REVIEW
5
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.
90
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.

400 ms

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

1.99 s

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

243 ms

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

0.076

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

1.23 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.

4.22 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 5 REVIEW 3 FIX
F
Page Weight Budget
Action
3.0 MB transferred, 143 requests
FIX
3.0 MB transferred, 143 requests
Warning::
Page weighs 12.4 MB (3.0 MB transferred)
Warning::
JavaScript is 1.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.5 MB
Warning::
143 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.62 g CO2 per page load
3.0 MB / 2.4 MB budget
3.0 MB transferred
143 requests
0.62 g CO2 per page load
JavaScript 1.5 MiB 52%
Other 874.9 KiB 29%
Images 306.8 KiB 10%
Other 133.6 KiB 4%
Fonts 48.6 KiB 2%
HTML 38.3 KiB 1%
CSS 36.0 KiB 1%
Other 10.4 KiB 0%
Other 629 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

F
JS Bundles
Action
62 scripts, 1.0 MB unused
FIX
62 scripts, 1.0 MB unused
Warning::
https://backlinko.com/_next/static/chunks/2f165a39...: 211 KB unused (97%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://backlinko.com/_next/static/chunks/pages/%5...: 119 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://backlinko.com/_next/static/chunks/pages/%5...: 119 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-HYWK...: 71 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-BPNL...: 71 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.0 MB
1056 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://backlinko.com/_next/static/chunks/2f165a39-82bad8da791021c3.js217 KB211 KB (97%)✓1st
https://backlinko.com/_next/static/chunks/pages/%5Bslug%5D-0a72330de375c937.js49 KB119 KB (43%)✓1st
https://backlinko.com/_next/static/chunks/pages/%5Bslug%5D-0a72330de375c937.js0 KB119 KB (43%)✓1st
https://www.googletagmanager.com/gtag/js?id=G-HYWKMHR981&cx=c&gtm=4e64h1177 KB71 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-BPNLXP3JQG&cx=c&gtm=4e64h1175 KB71 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-TZP6X1P137&cx=c&gtm=4e64h1158 KB66 KB (42%)✓3rd
https://backlinko.com/_next/static/chunks/9673-352fc077071c26dd.js0 KB64 KB (71%)✓1st
https://backlinko.com/_next/static/chunks/9673-352fc077071c26dd.js27 KB64 KB (71%)✓1st
https://www.googletagmanager.com/gtag/js?id=AW-951049332&cx=c&gtm=4e64h1147 KB64 KB (44%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PQRPZST159 KB63 KB (40%)✓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
143 resources · 3.0 MB · 1.0 MB savings available
FIX
143 resources · 3.0 MB · 1.0 MB savings available
Warning::
Page weight 2.0 MB over 1MB target
Got: 3.0 MB Expected: ≤ 1 MB
Info::
~1.0 MB of savings available
Warning::
57 third-party resources (41% of weight)
Info::
1 resources over 200KB
143 resources · 3.0 MiB · 57 third-party 2.0 MiB over 1MB target
JavaScript 56% · 1.7 MiB
Other 29% · 881.6 KiB
Image 10% · 316.7 KiB
Font 2% · 48.6 KiB
Document 1% · 38.3 KiB
CSS 1% · 36.0 KiB

~1.0 MiB of savings available

Remove unused JavaScript: 1.0 MiB
B
Third-Party Impact
41% third-party, 0 ms blocking
REVIEW
41% third-party, 0 ms blocking
Info::
Third-party code accounts for 41% of page weight (1.2 MiB of 3.0 MiB)
Info::
Third-party blocking time is low (0 ms)
59%
41%
First-party Third-party
B
Image Optimization
26 images, 0 KB saveable
REVIEW
26 images, 0 KB saveable
Warning::
https://api.backlinko.com/app/uploads/2020/02/div-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
26 images 307 KB
0 oversized -0 KB
7 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Execution Cost
Action
1469ms total JS execution
REVIEW
1469ms total JS execution
Warning::
https://backlinko.com/: 307ms CPU time
Warning::
https://backlinko.com/_next/static/chunks/pages/_a...: 265ms CPU time
Warning::
https://backlinko.com/_next/static/chunks/framewor...: 257ms CPU time
Info::
Unattributable: 226ms CPU time
Info::
https://backlinko.com/_next/static/chunks/pages/in...: 88ms CPU time
Info::
Third-party scripts: 553ms (38% of total)

Main Thread Breakdown

Script Evaluation 56% Other 20% Style & Layout 9% Script Parsing & Compilation 9% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://backlinko.com/307ms9ms2ms1st
https://backlinko.com/_next/static/chunks/pages/_app-02deb504ccdbc8a3.js265ms234ms2ms1st
https://backlinko.com/_next/static/chunks/framework-b9fd9bcc3ecde907.js257ms208ms4ms1st
Unattributable226ms28ms0ms3rd
https://backlinko.com/_next/static/chunks/pages/index-a30eb518b7dec67c.js88ms85ms0ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-PQRPZST81ms65ms8ms3rd
https://www.googletagmanager.com/gtag/js?id=G-HYWKMHR981&cx=c&gtm=4e64h176ms54ms14ms3rd
https://www.googletagmanager.com/gtag/js?id=G-BPNLXP3JQG&cx=c&gtm=4e64h159ms48ms10ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-951049332&cx=c&gtm=4e64h157ms45ms12ms3rd
https://www.googletagmanager.com/gtag/js?id=G-TZP6X1P137&cx=c&gtm=4e64h154ms44ms10ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
public,max-age=0,must-revalidate
REVIEW
public,max-age=0,must-revalidate
Info::
Cache-Control header is set
Got: public,max-age=0,must-revalidate
Info::
ETag present — enables conditional (304) responses
Cache-Control

public,max-age=0,must-revalidate

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
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
1 fonts (49 KB)
PASS
1 fonts (49 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

49 KB total

Render-blocking

0

of 1

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 FCP 400 ms LCP 2.0 shttps://backlinko.com/fonts/Inter-kern-latin.woff2Inter-kern-latin.woff2 https://backlinko.com/fonts/Inter-kern-latin.woff2 — 48.6 KiB — 45 ms — font-display: swap
Inter-kern-latin.woff2 woff2 swap
Size 49 KB
Load time 45 ms
Start 225 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
Network Waterfall
143 requests over 3488ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 400 ms LCP 2.0 shttps://backlinko.com// https://backlinko.com/ — 200 — 38.3 KiB — 243 ms — h2https://dev.visualwebsiteoptimizer.com/j.php?a=1074300&u=https%3A%2F%2Fbacklinko.com%2F&vn=2.2&ph=1&st=205.0999994277954&x=truedev.visualwebsiteoptimizer.com/j.ph... https://dev.visualwebsiteoptimizer.com/j.php?a=1074300&u=https%3A%2F%2Fbacklinko.com%2F&vn=2.2&ph=1&st=205.0999994277954&x=true — 200 — 3.8 KiB — 69 ms — h2https://backlinko.com/site.webmanifest?v=KmwbmdMLo6/site.webmanifest?v=KmwbmdMLo6 https://backlinko.com/site.webmanifest?v=KmwbmdMLo6 — 200 — 629 B — 96 ms — h2https://backlinko.com/fonts/Inter-kern-latin.woff2/fonts/Inter-kern-latin.woff2 https://backlinko.com/fonts/Inter-kern-latin.woff2 — 200 — 48.6 KiB — 45 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-PQRPZSTwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-PQRPZST — 200 — 159.2 KiB — 173 ms — h2https://backlinko.com/_next/static/chunks/webpack-9a176f481e8f52fb.js/_next/static/chunks/webpack-9a176f... https://backlinko.com/_next/static/chunks/webpack-9a176f481e8f52fb.js — 200 — 2.4 KiB — 51 ms — h2https://backlinko.com/_next/static/chunks/framework-b9fd9bcc3ecde907.js/_next/static/chunks/framework-b9fd... https://backlinko.com/_next/static/chunks/framework-b9fd9bcc3ecde907.js — 200 — 42.4 KiB — 131 ms — h2https://backlinko.com/_next/static/chunks/main-64922274feae0478.js/_next/static/chunks/main-64922274f... https://backlinko.com/_next/static/chunks/main-64922274feae0478.js — 200 — 43.5 KiB — 131 ms — h2https://backlinko.com/_next/static/chunks/pages/_app-02deb504ccdbc8a3.js/_next/static/chunks/pages/_app-02d... https://backlinko.com/_next/static/chunks/pages/_app-02deb504ccdbc8a3.js — 200 — 27.8 KiB — 56 ms — h2https://backlinko.com/_next/static/chunks/98bef5de-4abd22430e84aa9f.js/_next/static/chunks/98bef5de-4abd2... https://backlinko.com/_next/static/chunks/98bef5de-4abd22430e84aa9f.js — 200 — 949 B — 54 ms — h2https://backlinko.com/_next/static/chunks/2f165a39-82bad8da791021c3.js/_next/static/chunks/2f165a39-82bad... https://backlinko.com/_next/static/chunks/2f165a39-82bad8da791021c3.js — 200 — 217.2 KiB — 133 ms — h2https://backlinko.com/_next/static/chunks/7e42aecb-94f8c450c54b9556.js/_next/static/chunks/7e42aecb-94f8c... https://backlinko.com/_next/static/chunks/7e42aecb-94f8c450c54b9556.js — 200 — 23.7 KiB — 129 ms — h2https://backlinko.com/_next/static/chunks/1314-096b8da202875fdb.js/_next/static/chunks/1314-096b8da20... https://backlinko.com/_next/static/chunks/1314-096b8da202875fdb.js — 200 — 40.5 KiB — 115 ms — h2https://backlinko.com/_next/static/chunks/2867-05fbb03ac3179292.js/_next/static/chunks/2867-05fbb03ac... https://backlinko.com/_next/static/chunks/2867-05fbb03ac3179292.js — 200 — 2.6 KiB — 82 ms — h2https://backlinko.com/_next/static/chunks/2399-adbe4d9bf9c0d587.js/_next/static/chunks/2399-adbe4d9bf... https://backlinko.com/_next/static/chunks/2399-adbe4d9bf9c0d587.js — 200 — 3.0 KiB — 82 ms — h2https://backlinko.com/_next/static/chunks/9357-facdbd9041a2a2c7.js/_next/static/chunks/9357-facdbd904... https://backlinko.com/_next/static/chunks/9357-facdbd9041a2a2c7.js — 200 — 15.1 KiB — 81 ms — h2https://backlinko.com/_next/static/chunks/341-843bbd32e35a2a72.js/_next/static/chunks/341-843bbd32e3... https://backlinko.com/_next/static/chunks/341-843bbd32e35a2a72.js — 200 — 37.6 KiB — 127 ms — h2https://backlinko.com/_next/static/chunks/9179-6af4bb0d516e27f1.js/_next/static/chunks/9179-6af4bb0d5... https://backlinko.com/_next/static/chunks/9179-6af4bb0d516e27f1.js — 200 — 7.0 KiB — 74 ms — h2https://backlinko.com/_next/static/chunks/9504-4905c06b838daf5a.js/_next/static/chunks/9504-4905c06b8... https://backlinko.com/_next/static/chunks/9504-4905c06b838daf5a.js — 200 — 40.4 KiB — 102 ms — h2https://backlinko.com/_next/static/chunks/4910-1e6712dcf2298d9d.js/_next/static/chunks/4910-1e6712dcf... https://backlinko.com/_next/static/chunks/4910-1e6712dcf2298d9d.js — 200 — 24.7 KiB — 55 ms — h2https://backlinko.com/_next/static/chunks/8270-02d95cb983691a68.js/_next/static/chunks/8270-02d95cb98... https://backlinko.com/_next/static/chunks/8270-02d95cb983691a68.js — 200 — 3.1 KiB — 49 ms — h2https://backlinko.com/_next/static/chunks/3500-a2955f12733a2019.js/_next/static/chunks/3500-a2955f127... https://backlinko.com/_next/static/chunks/3500-a2955f12733a2019.js — 200 — 17.8 KiB — 66 ms — h2https://backlinko.com/_next/static/chunks/7427-29a638a6846460c9.js/_next/static/chunks/7427-29a638a68... https://backlinko.com/_next/static/chunks/7427-29a638a6846460c9.js — 200 — 6.2 KiB — 123 ms — h2https://backlinko.com/_next/static/chunks/8385-65d59c1c993e18cd.js/_next/static/chunks/8385-65d59c1c9... https://backlinko.com/_next/static/chunks/8385-65d59c1c993e18cd.js — 200 — 3.3 KiB — 117 ms — h2https://backlinko.com/_next/static/chunks/4870-95fa6656596de832.js/_next/static/chunks/4870-95fa66565... https://backlinko.com/_next/static/chunks/4870-95fa6656596de832.js — 200 — 5.0 KiB — 128 ms — h2https://backlinko.com/_next/static/chunks/5994-e500da0a2a37ee21.js/_next/static/chunks/5994-e500da0a2... https://backlinko.com/_next/static/chunks/5994-e500da0a2a37ee21.js — 200 — 3.1 KiB — 117 ms — h2https://backlinko.com/_next/static/chunks/5626-2deedfddbb4fe47d.js/_next/static/chunks/5626-2deedfddb... https://backlinko.com/_next/static/chunks/5626-2deedfddbb4fe47d.js — 200 — 86.0 KiB — 122 ms — h2https://backlinko.com/_next/static/chunks/pages/index-a30eb518b7dec67c.js/_next/static/chunks/pages/index-a3... https://backlinko.com/_next/static/chunks/pages/index-a30eb518b7dec67c.js — 200 — 1.1 KiB — 117 ms — h2https://backlinko.com/_next/static/U1vrGc_Cai9t3HEZvD5I-/_buildManifest.js/_next/static/U1vrGc_Cai9t3HEZvD5I-... https://backlinko.com/_next/static/U1vrGc_Cai9t3HEZvD5I-/_buildManifest.js — 200 — 1.5 KiB — 118 ms — h2https://backlinko.com/_next/static/U1vrGc_Cai9t3HEZvD5I-/_ssgManifest.js/_next/static/U1vrGc_Cai9t3HEZvD5I-... https://backlinko.com/_next/static/U1vrGc_Cai9t3HEZvD5I-/_ssgManifest.js — 200 — 747 B — 118 ms — h2
0 ms 1.0 s 2.0 s 3.0 s FCP 400 ms LCP 2.0 shttps://backlinko.com// https://backlinko.com/ — 200 — 38.3 KiB — 243 ms — h2https://dev.visualwebsiteoptimizer.com/j.php?a=1074300&u=https%3A%2F%2Fbacklinko.com%2F&vn=2.2&ph=1&st=205.0999994277954&x=truedev.visualwebsiteoptimizer.com/j.ph... https://dev.visualwebsiteoptimizer.com/j.php?a=1074300&u=https%3A%2F%2Fbacklinko.com%2F&vn=2.2&ph=1&st=205.0999994277954&x=true — 200 — 3.8 KiB — 69 ms — h2https://backlinko.com/site.webmanifest?v=KmwbmdMLo6/site.webmanifest?v=KmwbmdMLo6 https://backlinko.com/site.webmanifest?v=KmwbmdMLo6 — 200 — 629 B — 96 ms — h2https://backlinko.com/fonts/Inter-kern-latin.woff2/fonts/Inter-kern-latin.woff2 https://backlinko.com/fonts/Inter-kern-latin.woff2 — 200 — 48.6 KiB — 45 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-PQRPZSTwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-PQRPZST — 200 — 159.2 KiB — 173 ms — h2https://backlinko.com/_next/static/chunks/webpack-9a176f481e8f52fb.js/_next/static/chunks/webpack-9a176f... https://backlinko.com/_next/static/chunks/webpack-9a176f481e8f52fb.js — 200 — 2.4 KiB — 51 ms — h2https://backlinko.com/_next/static/chunks/framework-b9fd9bcc3ecde907.js/_next/static/chunks/framework-b9fd... https://backlinko.com/_next/static/chunks/framework-b9fd9bcc3ecde907.js — 200 — 42.4 KiB — 131 ms — h2https://backlinko.com/_next/static/chunks/main-64922274feae0478.js/_next/static/chunks/main-64922274f... https://backlinko.com/_next/static/chunks/main-64922274feae0478.js — 200 — 43.5 KiB — 131 ms — h2https://backlinko.com/_next/static/chunks/pages/_app-02deb504ccdbc8a3.js/_next/static/chunks/pages/_app-02d... https://backlinko.com/_next/static/chunks/pages/_app-02deb504ccdbc8a3.js — 200 — 27.8 KiB — 56 ms — h2https://backlinko.com/_next/static/chunks/98bef5de-4abd22430e84aa9f.js/_next/static/chunks/98bef5de-4abd2... 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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
38% of JavaScript execution is third-party
First-party Third-party 553ms · 816KB · $7/mo
Unattributable
Other
Costly
Execution 226ms
Transfer 0 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 81ms
Transfer 159 KB
Unused 40%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 76ms
Transfer 177 KB
Unused 40%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 59ms
Transfer 175 KB
Unused 40%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 57ms
Transfer 147 KB
Unused 44%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 54ms
Transfer 158 KB
Unused 42%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 226ms and costs ~$3/month

Unattributable takes 226ms 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

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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