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Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
87
GRADE
B
FIX
1
REVIEW
7
PASS
15
INFO
3

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

Mobile Desktop
74
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
84
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.

3.71 s

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

4.53 s

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

0 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.

4.73 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.

4.53 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
15 PASS 7 REVIEW 1 FIX
F
Page Weight Budget
Action
19.1 MB transferred, 21 requests
FIX
19.1 MB transferred, 21 requests
Critical::
Page weighs 19.6 MB (19.1 MB transferred)
Warning::
Images are 18.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 18.7 MB
Info::
Fonts are 245 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 245 KB
Info::
21 HTTP requests
Info::
Estimated 4.0 g CO2 per page load
19.1 MB / 2.4 MB budget
19.1 MB transferred
21 requests
4.0 g CO2 per page load
Images 18.7 MiB 97%
Fonts 245.2 KiB 1%
JavaScript 232.3 KiB 1%
CSS 17.2 KiB 0%
HTML 997 B 0%
Other 554 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

C
JS Execution Cost
Action
1953ms total JS execution
REVIEW
1953ms total JS execution
Warning::
Unattributable: 907ms CPU time
Warning::
https://nymeriarosebooks.com/: 705ms CPU time
Warning::
https://nymeriarosebooks.com/assets/index-BglyoBit...: 340ms CPU time

Main Thread Breakdown

Other 48% Style & Layout 32% Script Evaluation 17%
ScriptTotalScriptingParse/CompileParty
Unattributable907ms7ms0ms1st
https://nymeriarosebooks.com/705ms4ms1ms1st
https://nymeriarosebooks.com/assets/index-BglyoBit.js340ms319ms3ms1st
B
JS Bundles
1 scripts, 126 KB unused
REVIEW
1 scripts, 126 KB unused
Warning::
https://nymeriarosebooks.com/assets/index-BglyoBit...: 126 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 126 KB
126 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://nymeriarosebooks.com/assets/index-BglyoBit.js232 KB126 KB (55%)✓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

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
Document Compression
Document response uses gzip; brotli would be ~20% smaller
REVIEW
Document response uses gzip; brotli would be ~20% smaller
Info::
Main HTML response uses gzip (brotli would be ~20% smaller)
All current browsers support brotli. Most CDNs (Cloudflare, Fastly, AWS CloudFront, Vercel, Netlify) can switch from gzip to brotli with a single config flag. Origin servers (nginx, Apache) need a brotli module compiled in -- nginx-brotli or Apache mod_brotli.
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
21 resources · 19.1 MB · 126 KB savings available
REVIEW
21 resources · 19.1 MB · 126 KB savings available
Warning::
Page weight 19.1 MB exceeds 1 MB target by 18.1 MB
Got: 19.1 MB Expected: ≤ 1 MB
Info::
~126 KB of savings available
Info::
9 resources over 200KB
21 resources · 19.1 MiB · 0 third-party 18.1 MiB over 1MB target
Image 97% · 18.7 MiB
Font 1% · 245.2 KiB
JavaScript 1% · 232.3 KiB
CSS 0% · 17.2 KiB
Document 0% · 997 B

~126.5 KiB of savings available

Remove unused JavaScript: 126.5 KiB
B
HTTP Caching
no-cache
REVIEW
no-cache
Info::
Cache-Control header is set
Got: no-cache
Info::
ETag present — enables conditional (304) responses
Cache-Control

no-cache

DirectiveValueMeaning
no-cache—Cache but always revalidate first
A+
Third-Party Impact
No third-party resources
PASS
No third-party resources
Info::
No third-party resources detected
No third-party resources detected — all resources are first-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
11 images, 0 KB saveable
PASS
11 images, 0 KB saveable
Info::
All images are well-optimized
11 images 18.7 MB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
Font Loading
5 fonts (245 KB)
PASS
5 fonts (245 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

245 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 3.7 s LCP 4.5 shttps://nymeriarosebooks.com/.sfs-fonts/s/playwritegbj/v11/k3kLo8wSPe9dzQ1UGbvobAPhY7KP0QrU8KSa.woff2k3kLo8wSPe9dzQ1UGbvobAP... https://nymeriarosebooks.com/.sfs-fonts/s/playwritegbj/v11/k3kLo8wSPe9dzQ1UGbvobAPhY7KP0QrU8KSa.woff2 — 50.1 KiB — 680 ms — font-display: swaphttps://nymeriarosebooks.com/.sfs-fonts/s/dmsans/v17/rP2Yp2ywxg089UriI5-g4vlH9VoD8Cmcqbu0-K6z9mXg.woff2rP2Yp2ywxg089UriI5-g4vl... https://nymeriarosebooks.com/.sfs-fonts/s/dmsans/v17/rP2Yp2ywxg089UriI5-g4vlH9VoD8Cmcqbu0-K6z9mXg.woff2 — 36.5 KiB — 680 ms — font-display: swaphttps://nymeriarosebooks.com/.sfs-fonts/s/playwriteusmodern/v11/H4c7BWmRlMXPhla3hmMaveiYz8nSDkIFNtw6YbxK.woff2H4c7BWmRlMXPhla3hmMavei... https://nymeriarosebooks.com/.sfs-fonts/s/playwriteusmodern/v11/H4c7BWmRlMXPhla3hmMaveiYz8nSDkIFNtw6YbxK.woff2 — 45.2 KiB — 681 ms — font-display: swaphttps://nymeriarosebooks.com/.sfs-fonts/s/playwriteittrad/v11/SlGKmR6Yo5oYZX5BFVcEySBSPE50BivNh2q2Iw.woff2SlGKmR6Yo5oYZX5BFVcEySB... https://nymeriarosebooks.com/.sfs-fonts/s/playwriteittrad/v11/SlGKmR6Yo5oYZX5BFVcEySBSPE50BivNh2q2Iw.woff2 — 66.4 KiB — 693 ms — font-display: swaphttps://nymeriarosebooks.com/.sfs-fonts/s/playwritegbj/v11/k3kJo8wSPe9dzQ1UGbvobAPhY4KI2w328g.woff2k3kJo8wSPe9dzQ1UGbvobAP... https://nymeriarosebooks.com/.sfs-fonts/s/playwritegbj/v11/k3kJo8wSPe9dzQ1UGbvobAPhY4KI2w328g.woff2 — 47.1 KiB — 692 ms — font-display: swap
k3kLo8wSPe9dzQ1UGbvobAP... woff2 swap
Size 50 KB
Load time 680 ms
Start 549 ms
Risk FOUT — text flashes from fallback to web font
rP2Yp2ywxg089UriI5-g4vl... woff2 swap
Size 36 KB
Load time 680 ms
Start 552 ms
Risk FOUT — text flashes from fallback to web font
H4c7BWmRlMXPhla3hmMavei... woff2 swap
Size 45 KB
Load time 681 ms
Start 554 ms
Risk FOUT — text flashes from fallback to web font
SlGKmR6Yo5oYZX5BFVcEySB... woff2 swap
Size 66 KB
Load time 693 ms
Start 555 ms
Risk FOUT — text flashes from fallback to web font
k3kJo8wSPe9dzQ1UGbvobAP... woff2 swap
Size 47 KB
Load time 692 ms
Start 555 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+
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 uses no-cache -- safe revalidate-on-request policy
PASS
Main HTML uses no-cache -- safe revalidate-on-request policy
Info::
Main HTML uses no-cache -- safe revalidate-on-request policy
Got: no-cache
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: accept-encoding
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::
`ETag` present -- conditional GET supported
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+
JavaScript Blocking
No render-blocking JS or document.write usage detected
PASS
No render-blocking JS or document.write usage detected
Info::
No JavaScript blocking issues 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: IONOS SE

Asset Compression
No text asset hosts to measure
INFO
No text asset hosts to measure
Info::
No third-party or subdomain host served enough text assets to measure
Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.
Network Waterfall
21 requests over 4127ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 3.7 s LCP 4.5 shttps://nymeriarosebooks.com// https://nymeriarosebooks.com/ — 200 — 997 B — 129 ms — h2https://nymeriarosebooks.com/.sfs/css2?family=Playwrite+US+Modern:ital,wght@0,100;0,400;1,100;1,400&family=Playwrite+GB+J:ital,wght@0,100;0,400;1,100;1,400&family=Playwrite+IT+Trad:ital,wght@0,100;0,400;1,100;1,400&family=Playwrite+AR:ital,wght@0,100;0,400;1,100;1,400&family=Lora:ital,wght@0,400;0,600;0,700;1,400;1,600&family=DM+Sans:wght@400;500;600;700&display=swap/.sfs/css2?family=Playwrite+US+Mode... https://nymeriarosebooks.com/.sfs/css2?family=Playwrite+US+Modern:ital,wght@0,100;0,400;1,100;1,400&family=Playwrite+GB+J:ital,wght@0,100;0,400;1,100;1,400&family=Playwrite+IT+Trad:ital,wght@0,100;0,400;1,100;1,400&family=Playwrite+AR:ital,wght@0,100;0,400;1,100;1,400&family=Lora:ital,wght@0,400;0,600;0,700;1,400;1,600&family=DM+Sans:wght@400;500;600;700&display=swap — 200 — 2.2 KiB — 193 ms — h2https://nymeriarosebooks.com/assets/index-BglyoBit.js/assets/index-BglyoBit.js https://nymeriarosebooks.com/assets/index-BglyoBit.js — 200 — 232.3 KiB — 193 ms — h2https://nymeriarosebooks.com/assets/index-CrqMB9D6.css/assets/index-CrqMB9D6.css https://nymeriarosebooks.com/assets/index-CrqMB9D6.css — 200 — 15.0 KiB — 69 ms — h2https://nymeriarosebooks.com/static/logo-stone-marker.webp/static/logo-stone-marker.webp https://nymeriarosebooks.com/static/logo-stone-marker.webp — 200 — 31.5 KiB — 58 ms — h2https://nymeriarosebooks.com/static/author-nymeria-rose.jpg/static/author-nymeria-rose.jpg https://nymeriarosebooks.com/static/author-nymeria-rose.jpg — 200 — 76.0 KiB — 55 ms — h2https://nymeriarosebooks.com/static/char-walter-whale.webp/static/char-walter-whale.webp https://nymeriarosebooks.com/static/char-walter-whale.webp — 200 — 679.5 KiB — 126 ms — h2https://nymeriarosebooks.com/static/char-emma-age2.webp/static/char-emma-age2.webp https://nymeriarosebooks.com/static/char-emma-age2.webp — 200 — 283.6 KiB — 144 ms — h2https://nymeriarosebooks.com/static/char-riley-raccoon.webp/static/char-riley-raccoon.webp https://nymeriarosebooks.com/static/char-riley-raccoon.webp — 200 — 496.9 KiB — 183 ms — h2https://nymeriarosebooks.com/static/stock_bg-lake-children-bf8427-0.jpg/static/stock_bg-lake-children-bf84... https://nymeriarosebooks.com/static/stock_bg-lake-children-bf8427-0.jpg — 200 — 81.5 KiB — 131 ms — h2https://nymeriarosebooks.com/static/char-emma-age6.webp/static/char-emma-age6.webp https://nymeriarosebooks.com/static/char-emma-age6.webp — 200 — 335.3 KiB — 152 ms — h2https://nymeriarosebooks.com/static/char-emma-age9.webp/static/char-emma-age9.webp https://nymeriarosebooks.com/static/char-emma-age9.webp — 200 — 8.1 MiB — 859 ms — h2https://nymeriarosebooks.com/static/char-emma-age12.webp/static/char-emma-age12.webp https://nymeriarosebooks.com/static/char-emma-age12.webp — 200 — 7.9 MiB — 949 ms — h2https://nymeriarosebooks.com/static/lake-stillwater-bg.webp/static/lake-stillwater-bg.webp https://nymeriarosebooks.com/static/lake-stillwater-bg.webp — 200 — 302.7 KiB — 752 ms — h2https://nymeriarosebooks.com/.sfs-fonts/s/playwritegbj/v11/k3kLo8wSPe9dzQ1UGbvobAPhY7KP0QrU8KSa.woff2/.sfs-fonts/s/playwritegbj/v11/k3kL... https://nymeriarosebooks.com/.sfs-fonts/s/playwritegbj/v11/k3kLo8wSPe9dzQ1UGbvobAPhY7KP0QrU8KSa.woff2 — 200 — 50.1 KiB — 680 ms — h2https://nymeriarosebooks.com/.sfs-fonts/s/dmsans/v17/rP2Yp2ywxg089UriI5-g4vlH9VoD8Cmcqbu0-K6z9mXg.woff2/.sfs-fonts/s/dmsans/v17/rP2Yp2ywxg... https://nymeriarosebooks.com/.sfs-fonts/s/dmsans/v17/rP2Yp2ywxg089UriI5-g4vlH9VoD8Cmcqbu0-K6z9mXg.woff2 — 200 — 36.5 KiB — 680 ms — h2https://nymeriarosebooks.com/.sfs-fonts/s/playwriteusmodern/v11/H4c7BWmRlMXPhla3hmMaveiYz8nSDkIFNtw6YbxK.woff2/.sfs-fonts/s/playwriteusmodern/v11... https://nymeriarosebooks.com/.sfs-fonts/s/playwriteusmodern/v11/H4c7BWmRlMXPhla3hmMaveiYz8nSDkIFNtw6YbxK.woff2 — 200 — 45.2 KiB — 681 ms — h2https://nymeriarosebooks.com/.sfs-fonts/s/playwriteittrad/v11/SlGKmR6Yo5oYZX5BFVcEySBSPE50BivNh2q2Iw.woff2/.sfs-fonts/s/playwriteittrad/v11/S... https://nymeriarosebooks.com/.sfs-fonts/s/playwriteittrad/v11/SlGKmR6Yo5oYZX5BFVcEySBSPE50BivNh2q2Iw.woff2 — 200 — 66.4 KiB — 693 ms — h2https://nymeriarosebooks.com/.sfs-fonts/s/playwritegbj/v11/k3kJo8wSPe9dzQ1UGbvobAPhY4KI2w328g.woff2/.sfs-fonts/s/playwritegbj/v11/k3kJ... https://nymeriarosebooks.com/.sfs-fonts/s/playwritegbj/v11/k3kJo8wSPe9dzQ1UGbvobAPhY4KI2w328g.woff2 — 200 — 47.1 KiB — 692 ms — h2https://nymeriarosebooks.com/favicon.svg/favicon.svg https://nymeriarosebooks.com/favicon.svg — 200 — 554 B — 853 ms — h2https://nymeriarosebooks.com/static/char-oliver-otter.webp/static/char-oliver-otter.webp https://nymeriarosebooks.com/static/char-oliver-otter.webp — 200 — 463.0 KiB — 61 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization
8 images, 2589 KB total, 1317 KB wasted
INFO

Image Optimization Audit

Total Images

8

Total Size

2589 KB

Oversized

5

Wasted

1317 KB

8 missing dimensions 6 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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