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https://adhdreading.org

Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
90
GRADE
A
FIX
2
REVIEW
5
PASS
16
INFO
3

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

Mobile Desktop
51
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
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.

2.10 s

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

11.56 s

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

835 ms

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

0.000

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

4.24 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.

11.58 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
26
16 PASS 5 REVIEW 2 FIX
F
JS Execution Cost
Action
3718ms total JS execution
FIX
3718ms total JS execution
Warning::
https://adhdreading.org/: 943ms CPU time
Warning::
https://adhdreading.org/_next/static/chunks/1255-8...: 699ms CPU time
Warning::
Unattributable: 683ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-8VN0...: 538ms CPU time
Warning::
https://scripts.clarity.ms/0.8.69/clarity.js: 466ms CPU time
Info::
Third-party scripts: 1004ms (27% of total)

Main Thread Breakdown

Script Evaluation 50% Other 18% Style & Layout 17% Script Parsing & Compilation 5% Garbage Collection 4% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://adhdreading.org/943ms23ms40ms1st
https://adhdreading.org/_next/static/chunks/1255-884a804d7c86d3a7.js699ms635ms30ms1st
Unattributable683ms9ms0ms1st
https://www.googletagmanager.com/gtag/js?id=G-8VN0JG54JN538ms451ms81ms3rd
https://scripts.clarity.ms/0.8.69/clarity.js466ms319ms8ms3rd
https://adhdreading.org/_next/static/chunks/4bd1b696-100b9d70ed4e49c1.js319ms257ms24ms1st
https://adhdreading.org/_next/static/css/9f089d67a368c348.css71ms0ms0ms1st
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
Page Weight Budget
1.3 MB transferred, 43 requests
REVIEW
1.3 MB transferred, 43 requests
Info::
Page weighs 2.5 MB (1.3 MB transferred)
Info::
43 HTTP requests
Info::
Estimated 0.26 g CO2 per page load
1.3 MB / 2.4 MB budget
1.3 MB transferred
43 requests
0.26 g CO2 per page load
Images 750.0 KiB 58%
JavaScript 413.2 KiB 32%
Other 45.9 KiB 4%
HTML 41.6 KiB 3%
CSS 38.3 KiB 3%
Other 1.6 KiB 0%
Other 1.6 KiB 0%
Other 1.4 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget
B
JS Bundles
21 scripts, 70 KB unused
REVIEW
21 scripts, 70 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-8VN0...: 70 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 70 KB
70 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-8VN0JG54JN168 KB70 KB (42%)✓3rd
https://adhdreading.org/_next/static/chunks/1195-fe3bbead8eaa6cd2.js9 KB—✓1st
https://adhdreading.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js1 KB—✓1st
https://adhdreading.org/_next/static/chunks/webpack-299468d4e064a2ce.js2 KB—✓1st
https://adhdreading.org/_next/static/chunks/4bd1b696-100b9d70ed4e49c1.js53 KB—✓1st
https://adhdreading.org/_next/static/chunks/1255-884a804d7c86d3a7.js44 KB—✓1st
https://adhdreading.org/_next/static/chunks/main-app-24da8761396d27a6.js1 KB—✓1st
https://adhdreading.org/_next/static/chunks/3791-24092e910f47c726.js15 KB—✓1st
https://adhdreading.org/_next/static/chunks/2619-024c323f8ca0f6aa.js4 KB—✓1st
https://umami.bestvid.net/script.js3 KB—✓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

B
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
No Cache-Control header on main HTML response
Info::
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
B
Page Weight Inventory
43 resources · 1.3 MB · 70 KB savings available
REVIEW
43 resources · 1.3 MB · 70 KB savings available
Warning::
Page weight 1.3 MB exceeds 1 MB target by 270 KB
Got: 1.3 MB Expected: ≤ 1 MB
Info::
~70 KB of savings available
Info::
16 third-party resources (17% of weight)
Info::
1 resources over 200KB
43 resources · 1.3 MiB · 16 third-party 269.7 KiB over 1MB target
Image 61% · 794.7 KiB
JavaScript 32% · 413.2 KiB
Document 3% · 41.6 KiB
CSS 3% · 38.3 KiB
Other 0% · 5.9 KiB

~70.4 KiB of savings available

Remove unused JavaScript: 70.4 KiB
B
JavaScript Blocking
2 JS blocking issue(s) detected
REVIEW
2 JS blocking issue(s) detected
Warning::
1 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
Warning::
Total JS execution time is 3.7 s -- over the 3.5s budget
Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.
A+
Third-Party Impact
17% third-party, 0 ms blocking
PASS
17% third-party, 0 ms blocking
Info::
Third-party code accounts for 17% of page weight (215.9 KiB of 1.3 MiB)
Info::
Third-party blocking time is low (0 ms)
83%
17%
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
Image Optimization
7 images, 0 KB saveable
PASS
7 images, 0 KB saveable
Warning::
https://navfolders.com/badge/nav_dark.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
7 images 750 KB
0 oversized -0 KB
1 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

A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
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
4 hints, 0 missing preconnects
PASS
4 hints, 0 missing preconnects
Info::
Page uses 4 resource hint(s)

Current Resource Hints

preconnect
—
preload
4
dns-prefetch
—
prefetch
—

4 resource hints configured

A+
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
PASS
HTTP/3 advertised via Alt-Svc
Info::
HTTP/3 (QUIC) is supported
First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.
A+
Compression Algorithm
Main response uses brotli
PASS
Main response uses brotli
Info::
Main HTML response uses brotli (Content-Encoding: br)
Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Server-Timing Observability
3 Server-Timing entries advertised
PASS
3 Server-Timing entries advertised
Info::
Server-Timing header advertises 3 timing entries
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: rsc, next-router-state-tree, next-router-prefetch, next-router-segment-prefetch
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
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
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
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

Network Waterfall
43 requests over 3802ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 2.1 s LCP 11.6 shttps://adhdreading.org// https://adhdreading.org/ — 200 — 41.6 KiB — 291 ms — h3https://adhdreading.org/logos/logo.webp/logos/logo.webp https://adhdreading.org/logos/logo.webp — 200 — 16.1 KiB — 56 ms — h3https://adhdreading.org/_next/static/css/9f089d67a368c348.css/_next/static/css/9f089d67a368c348.... https://adhdreading.org/_next/static/css/9f089d67a368c348.css — 200 — 19.8 KiB — 46 ms — h3https://adhdreading.org/_next/static/css/1b30ee0fb9015853.css/_next/static/css/1b30ee0fb9015853.... https://adhdreading.org/_next/static/css/1b30ee0fb9015853.css — 200 — 18.4 KiB — 37 ms — h3https://umami.bestvid.net/script.jsumami.bestvid.net/script.js https://umami.bestvid.net/script.js — 200 — 3.0 KiB — 111 ms — h3https://analytics.ahrefs.com/analytics.jsanalytics.ahrefs.com/analytics.js https://analytics.ahrefs.com/analytics.js — 200 — 3.0 KiB — 73 ms — h3https://adhdreading.org/after-hd-840.webp/after-hd-840.webp https://adhdreading.org/after-hd-840.webp — 200 — 88.2 KiB — 270 ms — h3https://adhdreading.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js/cdn-cgi/scripts/5c5dd728/cloudflar... https://adhdreading.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js — 200 — 990 B — 42 ms — h3https://adhdreading.org/_next/static/chunks/webpack-299468d4e064a2ce.js/_next/static/chunks/webpack-299468... https://adhdreading.org/_next/static/chunks/webpack-299468d4e064a2ce.js — 200 — 2.3 KiB — 76 ms — h3https://adhdreading.org/_next/static/chunks/4bd1b696-100b9d70ed4e49c1.js/_next/static/chunks/4bd1b696-100b9... https://adhdreading.org/_next/static/chunks/4bd1b696-100b9d70ed4e49c1.js — 200 — 53.5 KiB — 102 ms — h3https://adhdreading.org/_next/static/chunks/1255-884a804d7c86d3a7.js/_next/static/chunks/1255-884a804d7... https://adhdreading.org/_next/static/chunks/1255-884a804d7c86d3a7.js — 200 — 44.2 KiB — 82 ms — h3https://adhdreading.org/_next/static/chunks/main-app-24da8761396d27a6.js/_next/static/chunks/main-app-24da8... https://adhdreading.org/_next/static/chunks/main-app-24da8761396d27a6.js — 200 — 758 B — 49 ms — h3https://adhdreading.org/_next/static/chunks/3791-24092e910f47c726.js/_next/static/chunks/3791-24092e910... https://adhdreading.org/_next/static/chunks/3791-24092e910f47c726.js — 200 — 14.9 KiB — 59 ms — h3https://adhdreading.org/_next/static/chunks/2619-024c323f8ca0f6aa.js/_next/static/chunks/2619-024c323f8... https://adhdreading.org/_next/static/chunks/2619-024c323f8ca0f6aa.js — 200 — 3.9 KiB — 92 ms — h3https://adhdreading.org/_next/static/chunks/1356-3d2e09e2e9c64ec1.js/_next/static/chunks/1356-3d2e09e2e... https://adhdreading.org/_next/static/chunks/1356-3d2e09e2e9c64ec1.js — 200 — 5.7 KiB — 73 ms — h3https://adhdreading.org/_next/static/chunks/1195-fe3bbead8eaa6cd2.js/_next/static/chunks/1195-fe3bbead8... https://adhdreading.org/_next/static/chunks/1195-fe3bbead8eaa6cd2.js — 200 — 8.5 KiB — 93 ms — h3https://adhdreading.org/_next/static/chunks/5674-f6ff218e55fdacf5.js/_next/static/chunks/5674-f6ff218e5... https://adhdreading.org/_next/static/chunks/5674-f6ff218e55fdacf5.js — 200 — 10.2 KiB — 93 ms — h3https://adhdreading.org/_next/static/chunks/app/%5Blocale%5D/(marketing)/(home)/page-a298ab49c654edbd.js/_next/static/chunks/app/%5Blocale%... https://adhdreading.org/_next/static/chunks/app/%5Blocale%5D/(marketing)/(home)/page-a298ab49c654edbd.js — 200 — 23.4 KiB — 95 ms — h3https://adhdreading.org/_next/static/chunks/9414-5a83e25fdaf795eb.js/_next/static/chunks/9414-5a83e25fd... https://adhdreading.org/_next/static/chunks/9414-5a83e25fdaf795eb.js — 200 — 13.5 KiB — 95 ms — h3https://adhdreading.org/_next/static/chunks/app/%5Blocale%5D/(marketing)/%5B...slug%5D/page-77b613a93428e5c9.js/_next/static/chunks/app/%5Blocale%... https://adhdreading.org/_next/static/chunks/app/%5Blocale%5D/(marketing)/%5B...slug%5D/page-77b613a93428e5c9.js — 200 — 5.3 KiB — 88 ms — h3https://adhdreading.org/_next/static/chunks/3961-ddea059e92924eee.js/_next/static/chunks/3961-ddea059e9... https://adhdreading.org/_next/static/chunks/3961-ddea059e92924eee.js — 200 — 7.3 KiB — 95 ms — h3https://adhdreading.org/_next/static/chunks/app/%5Blocale%5D/layout-4f6fc394c6607e71.js/_next/static/chunks/app/%5Blocale%... https://adhdreading.org/_next/static/chunks/app/%5Blocale%5D/layout-4f6fc394c6607e71.js — 200 — 7.4 KiB — 95 ms — h3https://adhdreading.org/before-hd-840.webp/before-hd-840.webp https://adhdreading.org/before-hd-840.webp — 200 — 77.4 KiB — 184 ms — h3https://adhdreading.org/site.webmanifest/site.webmanifest https://adhdreading.org/site.webmanifest — 200 — 1.4 KiB — 120 ms — h3https://static.cloudflareinsights.com/beacon.min.js/v4513226cdae34746b4dedf0b4dfa099e1781791509496static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v4513226cdae34746b4dedf0b4dfa099e1781791509496 — 200 — 11.3 KiB — 63 ms — h2https://adhdreading.org/cdn-cgi/rum?/cdn-cgi/rum? https://adhdreading.org/cdn-cgi/rum? — 204 — 450 B — 14 ms — h3https://adhdreading.org/favicon.ico/favicon.ico https://adhdreading.org/favicon.ico — 200 — 3.7 KiB — 38 ms — h3https://adhdreading.org/android-chrome-192x192.png/android-chrome-192x192.png https://adhdreading.org/android-chrome-192x192.png — 200 — 40.9 KiB — 656 ms — h3https://www.clarity.ms/tag/wtuttx5lziwww.clarity.ms/tag/wtuttx5lzi https://www.clarity.ms/tag/wtuttx5lzi — 200 — 1.1 KiB — 207 ms — http/1.1https://umami.bestvid.net/api/sendumami.bestvid.net/api/send https://umami.bestvid.net/api/send — 204 — 0 B — 711 ms — h3
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 2.1 s LCP 11.6 shttps://adhdreading.org// https://adhdreading.org/ — 200 — 41.6 KiB — 291 ms — h3https://adhdreading.org/logos/logo.webp/logos/logo.webp https://adhdreading.org/logos/logo.webp — 200 — 16.1 KiB — 56 ms — h3https://adhdreading.org/_next/static/css/9f089d67a368c348.css/_next/static/css/9f089d67a368c348.... https://adhdreading.org/_next/static/css/9f089d67a368c348.css — 200 — 19.8 KiB — 46 ms — h3https://adhdreading.org/_next/static/css/1b30ee0fb9015853.css/_next/static/css/1b30ee0fb9015853.... https://adhdreading.org/_next/static/css/1b30ee0fb9015853.css — 200 — 18.4 KiB — 37 ms — h3https://umami.bestvid.net/script.jsumami.bestvid.net/script.js https://umami.bestvid.net/script.js — 200 — 3.0 KiB — 111 ms — h3https://analytics.ahrefs.com/analytics.jsanalytics.ahrefs.com/analytics.js https://analytics.ahrefs.com/analytics.js — 200 — 3.0 KiB — 73 ms — h3https://adhdreading.org/after-hd-840.webp/after-hd-840.webp https://adhdreading.org/after-hd-840.webp — 200 — 88.2 KiB — 270 ms — h3https://adhdreading.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js/cdn-cgi/scripts/5c5dd728/cloudflar... https://adhdreading.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js — 200 — 990 B — 42 ms — h3https://adhdreading.org/_next/static/chunks/webpack-299468d4e064a2ce.js/_next/static/chunks/webpack-299468... https://adhdreading.org/_next/static/chunks/webpack-299468d4e064a2ce.js — 200 — 2.3 KiB — 76 ms — h3https://adhdreading.org/_next/static/chunks/4bd1b696-100b9d70ed4e49c1.js/_next/static/chunks/4bd1b696-100b9... https://adhdreading.org/_next/static/chunks/4bd1b696-100b9d70ed4e49c1.js — 200 — 53.5 KiB — 102 ms — h3https://adhdreading.org/_next/static/chunks/1255-884a804d7c86d3a7.js/_next/static/chunks/1255-884a804d7... https://adhdreading.org/_next/static/chunks/1255-884a804d7c86d3a7.js — 200 — 44.2 KiB — 82 ms — h3https://adhdreading.org/_next/static/chunks/main-app-24da8761396d27a6.js/_next/static/chunks/main-app-24da8... https://adhdreading.org/_next/static/chunks/main-app-24da8761396d27a6.js — 200 — 758 B — 49 ms — h3https://adhdreading.org/_next/static/chunks/3791-24092e910f47c726.js/_next/static/chunks/3791-24092e910... https://adhdreading.org/_next/static/chunks/3791-24092e910f47c726.js — 200 — 14.9 KiB — 59 ms — h3https://adhdreading.org/_next/static/chunks/2619-024c323f8ca0f6aa.js/_next/static/chunks/2619-024c323f8... https://adhdreading.org/_next/static/chunks/2619-024c323f8ca0f6aa.js — 200 — 3.9 KiB — 92 ms — h3https://adhdreading.org/_next/static/chunks/1356-3d2e09e2e9c64ec1.js/_next/static/chunks/1356-3d2e09e2e... https://adhdreading.org/_next/static/chunks/1356-3d2e09e2e9c64ec1.js — 200 — 5.7 KiB — 73 ms — h3https://adhdreading.org/_next/static/chunks/1195-fe3bbead8eaa6cd2.js/_next/static/chunks/1195-fe3bbead8... https://adhdreading.org/_next/static/chunks/1195-fe3bbead8eaa6cd2.js — 200 — 8.5 KiB — 93 ms — h3https://adhdreading.org/_next/static/chunks/5674-f6ff218e55fdacf5.js/_next/static/chunks/5674-f6ff218e5... https://adhdreading.org/_next/static/chunks/5674-f6ff218e55fdacf5.js — 200 — 10.2 KiB — 93 ms — h3https://adhdreading.org/_next/static/chunks/app/%5Blocale%5D/(marketing)/(home)/page-a298ab49c654edbd.js/_next/static/chunks/app/%5Blocale%... https://adhdreading.org/_next/static/chunks/app/%5Blocale%5D/(marketing)/(home)/page-a298ab49c654edbd.js — 200 — 23.4 KiB — 95 ms — h3https://adhdreading.org/_next/static/chunks/9414-5a83e25fdaf795eb.js/_next/static/chunks/9414-5a83e25fd... https://adhdreading.org/_next/static/chunks/9414-5a83e25fdaf795eb.js — 200 — 13.5 KiB — 95 ms — h3https://adhdreading.org/_next/static/chunks/app/%5Blocale%5D/(marketing)/%5B...slug%5D/page-77b613a93428e5c9.js/_next/static/chunks/app/%5Blocale%... https://adhdreading.org/_next/static/chunks/app/%5Blocale%5D/(marketing)/%5B...slug%5D/page-77b613a93428e5c9.js — 200 — 5.3 KiB — 88 ms — h3https://adhdreading.org/_next/static/chunks/3961-ddea059e92924eee.js/_next/static/chunks/3961-ddea059e9... https://adhdreading.org/_next/static/chunks/3961-ddea059e92924eee.js — 200 — 7.3 KiB — 95 ms — h3https://adhdreading.org/_next/static/chunks/app/%5Blocale%5D/layout-4f6fc394c6607e71.js/_next/static/chunks/app/%5Blocale%... https://adhdreading.org/_next/static/chunks/app/%5Blocale%5D/layout-4f6fc394c6607e71.js — 200 — 7.4 KiB — 95 ms — h3https://adhdreading.org/before-hd-840.webp/before-hd-840.webp https://adhdreading.org/before-hd-840.webp — 200 — 77.4 KiB — 184 ms — h3https://adhdreading.org/site.webmanifest/site.webmanifest https://adhdreading.org/site.webmanifest — 200 — 1.4 KiB — 120 ms — h3https://static.cloudflareinsights.com/beacon.min.js/v4513226cdae34746b4dedf0b4dfa099e1781791509496static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v4513226cdae34746b4dedf0b4dfa099e1781791509496 — 200 — 11.3 KiB — 63 ms — h2https://adhdreading.org/cdn-cgi/rum?/cdn-cgi/rum? 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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
27% of JavaScript execution is third-party
First-party Third-party 1004ms · 193KB · €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 538ms
Transfer 168 KB
Unused 42%
Monthly Cost €3/mo
Microsoft Clarity
Session Replay
Costly
Execution 466ms
Transfer 25 KB
Monthly Cost €2/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 538ms and costs ~€3/month
  • Microsoft Clarity adds 466ms and costs ~€2/month

Google Tag Manager takes 538ms 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

Microsoft Clarity takes 466ms 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

Image Optimization
37 images, 1183 KB total, 1050 KB wasted
INFO

Image Optimization Audit

Total Images

37

Total Size

1183 KB

Oversized

5

Wasted

1050 KB

35 missing dimensions 2 missing lazy loading
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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