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Performance

· 23 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
1
REVIEW
7
PASS
11
INFO
4

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

Mobile Desktop
71
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
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.
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.

826 ms

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

2.80 s

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

20 ms

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

0.252

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

1.14 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.

2.81 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
23
11 PASS 7 REVIEW 1 FIX
F
Page Weight Budget
Action
2.7 MB transferred, 73 requests
FIX
2.7 MB transferred, 73 requests
Warning::
Page weighs 5.2 MB (2.7 MB transferred)
Warning::
Images are 1.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.8 MB
Info::
73 HTTP requests
Info::
Estimated 0.56 g CO2 per page load
2.7 MB / 2.4 MB budget
2.7 MB transferred
73 requests
0.56 g CO2 per page load
Images 1.8 MiB 68%
JavaScript 452.0 KiB 17%
Fonts 196.3 KiB 7%
Other 75.2 KiB 3%
Other 54.1 KiB 2%
CSS 50.8 KiB 2%
HTML 50.1 KiB 2%
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

C
Image Optimization
Action
36 images, 0 KB saveable
REVIEW
36 images, 0 KB saveable
Warning::
https://www.readingrockets.org/themes/custom/readi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.readingrockets.org/themes/custom/readi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
36 images 1.8 MB
0 oversized -0 KB
10 legacy format
2 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

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
1125ms total JS execution
REVIEW
1125ms total JS execution
Warning::
https://www.readingrockets.org/: 626ms CPU time
Info::
Unattributable: 193ms CPU time
Info::
https://www.readingrockets.org/sites/default/files...: 107ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-N57...: 76ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-JEBE...: 65ms CPU time
Info::
Third-party scripts: 200ms (18% of total)

Main Thread Breakdown

Other 33% Style & Layout 29% Script Evaluation 24% Parse HTML & CSS 6% Script Parsing & Compilation 4% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.readingrockets.org/626ms9ms1ms1st
Unattributable193ms23ms0ms1st
https://www.readingrockets.org/sites/default/files/js/js_NV6AhuKEGPT5fCuOs8ub6sybUcptyCfgOBuWS8vcvpQ.js?scope=footer&delta=1&language=en&theme=readingrockets_d9&include=eJxlj9sOwiAMQH-IyLOPfgnpRtN1louFqfj1Ml7c4stJOIc2KaVEgq4CWeowdH5fYIX3WQYj8Gl2h1FPbmOHggFjLXYGTVtBGeGFFSxJmkDcWn4qgwIp5MVliPtfBM-RNM13rMX563Hory3doBpV57lkgWbXx4ba3JxChsoTC9e297KAoh28RQ69pXjwlfvOYJ6Mr2IHx7FfvNRqgw107ms44ms2ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-N57G8NB76ms64ms11ms3rd
https://www.googletagmanager.com/gtag/js?id=G-JEBE1MXWDM&cx=c&gtm=4e66h065ms50ms14ms3rd
https://script.hotjar.com/modules.c7cfa5e5dff97bece8fc.js59ms47ms11ms3rd
C
JS Bundles
Action
15 scripts, 178 KB unused
REVIEW
15 scripts, 178 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-JEBE...: 71 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-N57...: 69 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://script.hotjar.com/modules.c7cfa5e5dff97bec...: 38 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 178 KB
178 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-JEBE1MXWDM&cx=c&gtm=4e66h0174 KB71 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-N57G8NB134 KB69 KB (52%)✓3rd
https://script.hotjar.com/modules.c7cfa5e5dff97bece8fc.js56 KB38 KB (67%)✓3rd
https://www.readingrockets.org/core/assets/vendor/jquery/jquery.min.js?v=4.0.029 KB—✓1st
https://kit.fontawesome.com/eb1ea169a9.js6 KB—✓3rd
https://www.readingrockets.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js1 KB—✓1st
https://www.readingrockets.org/sites/default/files/js/js_2Mqa-U2O2WtOeSW7MAGsfgEy7k7-eT981WvVnRpzoEc.js?scope=header&delta=0&language=en&theme=readingrockets_d9&include=eJxlj9sOwiAMQH-IyLOPfgnpRtN1louFqfj1Ml7c4stJOIc2KaVEgq4CWeowdH5fYIX3WQYj8Gl2h1FPbmOHggFjLXYGTVtBGeGFFSxJmkDcWn4qgwIp5MVliPtfBM-RNM13rMX563Hory3doBpV57lkgWbXx4ba3JxChsoTC9e297KAoh28RQ69pXjwlfvOYJ6Mr2IHx7FfvNRqgw0 KB—✓1st
https://www.readingrockets.org/sites/default/files/js/js_NV6AhuKEGPT5fCuOs8ub6sybUcptyCfgOBuWS8vcvpQ.js?scope=footer&delta=1&language=en&theme=readingrockets_d9&include=eJxlj9sOwiAMQH-IyLOPfgnpRtN1louFqfj1Ml7c4stJOIc2KaVEgq4CWeowdH5fYIX3WQYj8Gl2h1FPbmOHggFjLXYGTVtBGeGFFSxJmkDcWn4qgwIp5MVliPtfBM-RNM13rMX563Hory3doBpV57lkgWbXx4ba3JxChsoTC9e297KAoh28RQ69pXjwlfvOYJ6Mr2IHx7FfvNRqgw24 KB—✓1st
https://cdn.jsdelivr.net/npm/focus-visible@5.2.0/dist/focus-visible.min.js2 KB—✓3rd
https://www.readingrockets.org/sites/default/files/js/js_l_ORm-W0hINTfu4kHL3bIYlfwMF8qg13OOaLslybm6o.js?scope=footer&delta=5&language=en&theme=readingrockets_d9&include=eJxlj9sOwiAMQH-IyLOPfgnpRtN1louFqfj1Ml7c4stJOIc2KaVEgq4CWeowdH5fYIX3WQYj8Gl2h1FPbmOHggFjLXYGTVtBGeGFFSxJmkDcWn4qgwIp5MVliPtfBM-RNM13rMX563Hory3doBpV57lkgWbXx4ba3JxChsoTC9e297KAoh28RQ69pXjwlfvOYJ6Mr2IHx7FfvNRqgw15 KB—✓1st

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

B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
C
Page Weight Inventory
Action
73 resources · 2.7 MB · 178 KB savings available
REVIEW
73 resources · 2.7 MB · 178 KB savings available
Warning::
Page weight 2.7 MB exceeds 1 MB target by 1.7 MB
Got: 2.7 MB Expected: ≤ 1 MB
Info::
~178 KB of savings available
Info::
24 third-party resources (23% of weight)
Info::
4 resources over 200KB
73 resources · 2.7 MiB · 24 third-party 1.7 MiB over 1MB target
Image 69% · 1.9 MiB
JavaScript 17% · 452.0 KiB
Font 7% · 196.3 KiB
CSS 4% · 104.4 KiB
Document 3% · 84.5 KiB
Other 0% · 863 B

~177.8 KiB of savings available

Remove unused JavaScript: 177.8 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Third-Party Impact
23% third-party, 0 ms blocking
PASS
23% third-party, 0 ms blocking
Info::
Third-party code accounts for 23% of page weight (632.9 KiB of 2.7 MiB)
Info::
Third-party blocking time is low (0 ms)
77%
23%
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
10 fonts (196 KB)
PASS
10 fonts (196 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

196 KB total

Render-blocking

0

of 10

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 826 ms LCP 2.8 shttps://use.typekit.net/af/f18587/00000000000000007735a07a/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/f18587/00000000000000007735a07a/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 17.6 KiB — 14 ms — font-display: swaphttps://use.typekit.net/af/8939f9/00000000000000007735a061/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/8939f9/00000000000000007735a061/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 18.4 KiB — 21 ms — font-display: swaphttps://use.typekit.net/af/f8d078/00000000000000003b9b01f0/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/f8d078/00000000000000003b9b01f0/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 24.2 KiB — 19 ms — font-display: swaphttps://use.typekit.net/af/d4e28f/00000000000000007735a072/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i4&v=3l https://use.typekit.net/af/d4e28f/00000000000000007735a072/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i4&v=3 — 16.9 KiB — 15 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v5.15.4/webfonts/pro-fa-regular-400-5.0.0.woff2pro-fa-regular-400-5.0.... https://ka-p.fontawesome.com/releases/v5.15.4/webfonts/pro-fa-regular-400-5.0.0.woff2 — 22.9 KiB — 22 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v5.15.4/webfonts/pro-fa-solid-900-5.10.2.woff2pro-fa-solid-900-5.10.2... https://ka-p.fontawesome.com/releases/v5.15.4/webfonts/pro-fa-solid-900-5.10.2.woff2 — 13.1 KiB — 31 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v5.15.4/webfonts/pro-fa-light-300-5.0.0.woff2pro-fa-light-300-5.0.0.... https://ka-p.fontawesome.com/releases/v5.15.4/webfonts/pro-fa-light-300-5.0.0.woff2 — 24.3 KiB — 29 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v5.15.4/webfonts/pro-fa-brands-400-5.8.2.woff2pro-fa-brands-400-5.8.2... https://ka-p.fontawesome.com/releases/v5.15.4/webfonts/pro-fa-brands-400-5.8.2.woff2 — 2.5 KiB — 21 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v5.15.4/webfonts/pro-fa-brands-400-5.0.0.woff2pro-fa-brands-400-5.0.0... https://ka-p.fontawesome.com/releases/v5.15.4/webfonts/pro-fa-brands-400-5.0.0.woff2 — 37.0 KiB — 32 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v5.15.4/webfonts/pro-fa-solid-900-5.0.0.woff2pro-fa-solid-900-5.0.0.... https://ka-p.fontawesome.com/releases/v5.15.4/webfonts/pro-fa-solid-900-5.0.0.woff2 — 19.4 KiB — 32 ms — font-display: swap
l woff2 swap
Size 18 KB
Load time 14 ms
Start 589 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 18 KB
Load time 21 ms
Start 589 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 24 KB
Load time 19 ms
Start 589 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 17 KB
Load time 15 ms
Start 590 ms
Risk FOUT — text flashes from fallback to web font
pro-fa-regular-400-5.0.... woff2 swap
Size 23 KB
Load time 22 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
pro-fa-solid-900-5.10.2... woff2 swap
Size 13 KB
Load time 31 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
pro-fa-light-300-5.0.0.... woff2 swap
Size 24 KB
Load time 29 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
pro-fa-brands-400-5.8.2... woff2 swap
Size 2 KB
Load time 21 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
pro-fa-brands-400-5.0.0... woff2 swap
Size 37 KB
Load time 32 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
pro-fa-solid-900-5.0.0.... woff2 swap
Size 19 KB
Load time 32 ms
Start 1.4 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+
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+
Main HTML Cache-Control
Main HTML max-age=300 (≤ 5min) is appropriate
PASS
Main HTML max-age=300 (≤ 5min) is appropriate
Info::
Main HTML max-age=300 (≤ 5min) is appropriate
Got: max-age=300, public
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: Cookie
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::
`Last-Modified` present -- timestamp-based conditional GET supported
Consider also setting `ETag` for stronger revalidation -- ETags are content hashes that don't suffer from clock-skew or DST issues. Last-Modified alone is functional for conditional GETs and not a bug.
A+
HTTP Caching
max-age=300 (5 minutes)
PASS
max-age=300 (5 minutes)
Info::
Cache-Control header is set
Got: max-age=300, public
Info::
Effective TTL: 5 minutes (max-age=300)
Info::
Last-Modified header present
Cache-Control

max-age=300, public

DirectiveValueMeaning
max-age300Cache for 5 minutes
public—Any cache may store this response
Effective TTL: 300 seconds
Network Waterfall
73 requests over 1743ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 826 ms LCP 2.8 shttps://www.readingrockets.org// https://www.readingrockets.org/ — 200 — 50.1 KiB — 497 ms — h2https://www.readingrockets.org/sites/default/files/css/css_0A4vg1uTbMQp7VPIqAPNS4OE5L5M3E3wai__ogPeEiw.css?delta=0&language=en&theme=readingrockets_d9&include=eJx9UUFywyAM_JDHnPsaRhjFpsGISqKOf1_Fk8Sd2s2FQbuLtFoCqiJ7oSFB9jIBpzL60FSpiBNds9XdQIwucquQe_iEW1eBYWSokzzhHelbqS3kJBPGjuPo8WYjirW3XldxR2hTteQx44xFxQ3A1ATzRiyo4C5E9mKvx0zBng8iO_ay4HEOGCNGHzIN1zNFhYLZj5yiZ1o6Roi2KJsaVXz8uFuI5_DD2ZHKIMJEsxdlUBzXE9Fv3wdyMsQCwRNqTiX5fzxtnCLIPaAD-2fnt4qvZim_Vaj93IngMV1WUZxdsKLTtZLle1nd69Z9J1zEbWc_U2wZfwBXoPwK/sites/default/files/css/css_0A4vg1... https://www.readingrockets.org/sites/default/files/css/css_0A4vg1uTbMQp7VPIqAPNS4OE5L5M3E3wai__ogPeEiw.css?delta=0&language=en&theme=readingrockets_d9&include=eJx9UUFywyAM_JDHnPsaRhjFpsGISqKOf1_Fk8Sd2s2FQbuLtFoCqiJ7oSFB9jIBpzL60FSpiBNds9XdQIwucquQe_iEW1eBYWSokzzhHelbqS3kJBPGjuPo8WYjirW3XldxR2hTteQx44xFxQ3A1ATzRiyo4C5E9mKvx0zBng8iO_ay4HEOGCNGHzIN1zNFhYLZj5yiZ1o6Roi2KJsaVXz8uFuI5_DD2ZHKIMJEsxdlUBzXE9Fv3wdyMsQCwRNqTiX5fzxtnCLIPaAD-2fnt4qvZim_Vaj93IngMV1WUZxdsKLTtZLle1nd69Z9J1zEbWc_U2wZfwBXoPwK — 200 — 1.8 KiB — 31 ms — 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h2https://www.google-analytics.com/g/collect?v=2&tid=G-JEBE1MXWDM&gtm=45je66h0v886679095z8844755761za20gzb844755761zd844755761&_p=1782253779851&gcd=13l3l3l3l1l1&npa=0&dma=0&gdid=dMDhkMT&_eu=AAAAAAAC&are=1&cid=14487141.1782253781&frm=0&pscdl=noapi&rcb=13&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&_s=1&tag_exp=115938465~115938468~118395335~119027224~119392696~119392704~119534189&sid=1782253781&sct=1&seg=0&dl=https%3A%2F%2Fwww.readingrockets.org%2F&dt=Reading%20Rockets%3A%20Launching%20Young%20Readers&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1676www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-JEBE1MXWDM&gtm=45je66h0v886679095z8844755761za20gzb844755761zd844755761&_p=1782253779851&gcd=13l3l3l3l1l1&npa=0&dma=0&gdid=dMDhkMT&_eu=AAAAAAAC&are=1&cid=14487141.1782253781&frm=0&pscdl=noapi&rcb=13&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&_s=1&tag_exp=115938465~115938468~118395335~119027224~119392696~119392704~119534189&sid=1782253781&sct=1&seg=0&dl=https%3A%2F%2Fwww.readingrockets.org%2F&dt=Reading%20Rockets%3A%20Launching%20Young%20Readers&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1676 — 204 — 554 B — 50 ms — h2https://www.readingrockets.org/themes/custom/readingrockets_d9/icon.svg/themes/custom/readingrockets_d9/ic... https://www.readingrockets.org/themes/custom/readingrockets_d9/icon.svg — 404 — 34.5 KiB — 25 ms — h2https://www.readingrockets.org/themes/custom/readingrockets_d9/favicon.ico/themes/custom/readingrockets_d9/fa... https://www.readingrockets.org/themes/custom/readingrockets_d9/favicon.ico — 200 — 40.5 KiB — 23 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
18% of JavaScript execution is third-party
First-party Third-party 200ms · 364KB · $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 76ms
Transfer 134 KB
Unused 52%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 65ms
Transfer 174 KB
Unused 41%
Monthly Cost $1/mo
Hotjar
Session Replay
Optional
Execution 59ms
Transfer 56 KB
Unused 67%
Monthly Cost $1/mo

52% 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

67% of Hotjar'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

Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-05-25 — 2026-06-21)

LCP (p75)

2557 ms

74% good

INP (p75)

82 ms

95% good

CLS (p75)

0.020

91% good

FCP (p75)

1604 ms

TTFB (p75)

667 ms

Image Optimization
44 images, 1039 KB total, 55 KB wasted
INFO

Image Optimization Audit

Total Images

44

Total Size

1039 KB

Oversized

3

Wasted

55 KB

2 missing dimensions 1 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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