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https://dosebuddy-frontend.dosebuddy-health.workers.dev

Performance

· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
92
GRADE
A
FIX
1
REVIEW
5
PASS
18
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.
95
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.

4.18 s

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

4.59 s

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

28 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.

4.18 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.

4.59 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
27
18 PASS 5 REVIEW 1 FIX
D
JS Bundles
Action
7 scripts, 238 KB unused
FIX
7 scripts, 238 KB unused
Warning::
https://cdn.jsdelivr.net/npm/jspdf@2.5.1/dist/jspd...: 92 KB unused (83%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://dosebuddy-frontend.dosebuddy-health.worker...: 92 KB unused (83%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://dosebuddy-frontend.dosebuddy-health.worker...: unminified — 39 KB could be saved
Warning::
https://cdn.jsdelivr.net/npm/chart.js: 54 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 238 KB
238 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn.jsdelivr.net/npm/jspdf@2.5.1/dist/jspdf.umd.min.js112 KB92 KB (83%)✓3rd
https://dosebuddy-frontend.dosebuddy-health.workers.dev/app.js?v=2112 KB92 KB (83%)✗1st
https://cdn.jsdelivr.net/npm/chart.js61 KB54 KB (89%)✓3rd
https://cdn.jsdelivr.net/npm/jspdf-autotable@3.8.2/dist/jspdf.plugin.autotable.min.js12 KB—✓3rd
https://dosebuddy-frontend.dosebuddy-health.workers.dev/markdown.js2 KB—✓1st
https://dosebuddy-frontend.dosebuddy-health.workers.dev/dose-tag.js1 KB—✓1st
https://dosebuddy-frontend.dosebuddy-health.workers.dev/api-base.js1 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
Third-Party Impact
47% third-party, 0 ms blocking
REVIEW
47% third-party, 0 ms blocking
Info::
Third-party code accounts for 47% of page weight (234.1 KiB of 499.6 KiB)
Info::
Third-party blocking time is low (0 ms)
53%
47%
First-party Third-party
B
JS Execution Cost
566ms total JS execution
REVIEW
566ms total JS execution
Info::
Unattributable: 207ms CPU time
Info::
https://dosebuddy-frontend.dosebuddy-health.worker...: 205ms CPU time
Info::
https://dosebuddy-frontend.dosebuddy-health.worker...: 96ms CPU time
Info::
https://cdn.jsdelivr.net/npm/jspdf@2.5.1/dist/jspd...: 58ms CPU time
Info::
Third-party scripts: 58ms (10% of total)

Main Thread Breakdown

Other 41% Style & Layout 21% Script Evaluation 18% Parse HTML & CSS 10% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
Unattributable207ms8ms0ms1st
https://dosebuddy-frontend.dosebuddy-health.workers.dev/app.js?v=2205ms47ms3ms1st
https://dosebuddy-frontend.dosebuddy-health.workers.dev/96ms4ms1ms1st
https://cdn.jsdelivr.net/npm/jspdf@2.5.1/dist/jspdf.umd.min.js58ms31ms26ms3rd
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.
B
Page Weight Inventory
14 resources · 500 KB · 238 KB savings available
REVIEW
14 resources · 500 KB · 238 KB savings available
Info::
Within 1MB page-weight target
Got: 500 KB
Info::
~238 KB of savings available
Warning::
6 third-party resources (47% of weight)
14 resources · 499.6 KiB · 6 third-party Within 1MB page-weight target
JavaScript 60% · 301.1 KiB
Media 13% · 63.5 KiB
CSS 12% · 59.4 KiB
Font 9% · 47.3 KiB
Document 6% · 27.6 KiB
Image 0% · 763 B

~238.0 KiB of savings available

Remove unused JavaScript: 238.0 KiB
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::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
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+
Page Weight Budget
500 KB transferred, 14 requests
PASS
500 KB transferred, 14 requests
Info::
Page weighs 1.7 MB (500 KB transferred)
Info::
14 HTTP requests
Info::
Estimated 0.10 g CO2 per page load
500 KB / 2.4 MB budget
500 KB transferred
14 requests
0.10 g CO2 per page load
JavaScript 301.1 KiB 60%
Other 63.5 KiB 13%
CSS 59.4 KiB 12%
Fonts 47.3 KiB 9%
HTML 27.6 KiB 6%
Images 763 B 0%
0 2.4 MB 4.9 MB
Under budget
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
1 images, 0 KB saveable
PASS
1 images, 0 KB saveable
Info::
All images are well-optimized
1 images 1 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
Font Loading
1 fonts (47 KB)
PASS
1 fonts (47 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

47 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 1.0 s 2.0 s 3.0 s 4.0 s FCP 4.2 s LCP 4.6 shttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2UcC73FwrK3iLTeHuS_nVMrM... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 47.3 KiB — 61 ms — font-display: swap
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 47 KB
Load time 61 ms
Start 494 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
2
preload
—
dns-prefetch
—
prefetch
—

2 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+
Document Compression
Document response uses brotli
PASS
Document 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+
Asset Compression
All 1 asset host use brotli
PASS
All 1 asset host use brotli
Info::
cdn.jsdelivr.net serves assets with brotli (assets: 3)
Got: cdn.jsdelivr.net (application/javascript)
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=0 (≤ 5min) is appropriate
PASS
Main HTML max-age=0 (≤ 5min) is appropriate
Info::
Main HTML max-age=0 (≤ 5min) is appropriate
Got: public, max-age=0, must-revalidate
A
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Warning::
Compressed response missing `Vary` header
The page is served with `Content-Encoding: br` but has no `Vary` header. Without `Vary: Accept-Encoding`, intermediary caches (corporate proxies, ISP caches) may serve the compressed variant to clients that didn't send the matching `Accept-Encoding` -- the client sees garbled bytes. Add `Vary: Accept-Encoding` whenever the response is conditionally compressed.
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
JavaScript Blocking
1 JS blocking issue(s) detected
PASS
1 JS blocking issue(s) detected
Warning::
3 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.
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
14 requests over 555ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 4.2 s LCP 4.6 shttps://dosebuddy-frontend.dosebuddy-health.workers.dev// https://dosebuddy-frontend.dosebuddy-health.workers.dev/ — 200 — 27.6 KiB — 114 ms — h2https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swapfonts.googleapis.com/css2?family=In... https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap — 200 — 1.2 KiB — 164 ms — h2https://cdn.jsdelivr.net/npm/chart.jscdn.jsdelivr.net/npm/chart.js https://cdn.jsdelivr.net/npm/chart.js — 200 — 60.8 KiB — 103 ms — h2https://cdn.jsdelivr.net/npm/jspdf@2.5.1/dist/jspdf.umd.min.jscdn.jsdelivr.net/npm/jspdf@2.5.1/di... https://cdn.jsdelivr.net/npm/jspdf@2.5.1/dist/jspdf.umd.min.js — 200 — 111.7 KiB — 132 ms — h2https://cdn.jsdelivr.net/npm/jspdf-autotable@3.8.2/dist/jspdf.plugin.autotable.min.jscdn.jsdelivr.net/npm/jspdf-autotabl... https://cdn.jsdelivr.net/npm/jspdf-autotable@3.8.2/dist/jspdf.plugin.autotable.min.js — 200 — 12.3 KiB — 113 ms — h2https://dosebuddy-frontend.dosebuddy-health.workers.dev/style.css/style.css https://dosebuddy-frontend.dosebuddy-health.workers.dev/style.css — 200 — 43.1 KiB — 89 ms — h2https://dosebuddy-frontend.dosebuddy-health.workers.dev/responsive.css/responsive.css https://dosebuddy-frontend.dosebuddy-health.workers.dev/responsive.css — 200 — 15.0 KiB — 56 ms — h2https://flagcdn.com/w40/in.pngflagcdn.com/w40/in.png https://flagcdn.com/w40/in.png — 200 — 763 B — 79 ms — h3https://dosebuddy-frontend.dosebuddy-health.workers.dev/app.js?v=2/app.js?v=2 https://dosebuddy-frontend.dosebuddy-health.workers.dev/app.js?v=2 — 200 — 112.3 KiB — 115 ms — h2https://dosebuddy-frontend.dosebuddy-health.workers.dev/notify-sound.mp3/notify-sound.mp3 https://dosebuddy-frontend.dosebuddy-health.workers.dev/notify-sound.mp3 — 200 — 63.5 KiB — 89 ms — h3https://dosebuddy-frontend.dosebuddy-health.workers.dev/markdown.js/markdown.js https://dosebuddy-frontend.dosebuddy-health.workers.dev/markdown.js — 200 — 2.1 KiB — 95 ms — h3https://dosebuddy-frontend.dosebuddy-health.workers.dev/dose-tag.js/dose-tag.js https://dosebuddy-frontend.dosebuddy-health.workers.dev/dose-tag.js — 200 — 1022 B — 93 ms — h3https://dosebuddy-frontend.dosebuddy-health.workers.dev/api-base.js/api-base.js https://dosebuddy-frontend.dosebuddy-health.workers.dev/api-base.js — 200 — 1.0 KiB — 95 ms — h3https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2fonts.gstatic.com/s/inter/v20/UcC73... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 200 — 47.3 KiB — 61 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
10% of JavaScript execution is third-party
First-party Third-party 58ms · 112KB · $1/mo
jsDelivr
CDN
Optional
Execution 58ms
Transfer 112 KB
Unused 83%
Monthly Cost $1/mo

83% of jsDelivr'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

Image Optimization
2 images, 0 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

2

Total Size

0 KB

2 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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