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https://sdnegeri4keling.sch.id

Performance

· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
89
GRADE
B
FIX
1
REVIEW
4
PASS
14
INFO
3

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

Mobile Desktop
82
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
71
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.
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.

851 ms

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

3.15 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.

0.002

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

947 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

3.15 s

Page Load Progression

497 ms
994 ms
1.5 s
2.0 s
2.5 s
3.0 s
3.5 s
4.0 s
Checks
22
14 PASS 4 REVIEW 1 FIX
F
Page Weight Budget
Action
3.0 MB transferred, 24 requests
FIX
3.0 MB transferred, 24 requests
Warning::
Page weighs 3.1 MB (3.0 MB transferred)
Warning::
Images are 2.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.8 MB
Info::
24 HTTP requests
Info::
Estimated 0.63 g CO2 per page load
3.0 MB / 2.4 MB budget
3.0 MB transferred
24 requests
0.63 g CO2 per page load
Images 2.8 MiB 93%
Fonts 174.3 KiB 6%
CSS 21.9 KiB 1%
HTML 5.7 KiB 0%
JavaScript 2.4 KiB 0%
Other 497 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

B
Image Optimization
10 images, 0 KB saveable
REVIEW
10 images, 0 KB saveable
Warning::
https://sdnegeri4keling.sch.id/images/potoanaksd.p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
10 images 2.8 MB
0 oversized -0 KB
10 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

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
24 resources · 3.0 MB · 0 KB savings available
REVIEW
24 resources · 3.0 MB · 0 KB savings available
Warning::
Page weight 3.0 MB exceeds 1 MB target by 2.0 MB
Got: 3.0 MB Expected: ≤ 1 MB
Info::
11 third-party resources (7% of weight)
Info::
4 resources over 200KB
24 resources · 3.0 MiB · 11 third-party 2.0 MiB over 1MB target
Image 93% · 2.8 MiB
Font 6% · 174.3 KiB
CSS 1% · 21.9 KiB
Document 0% · 5.7 KiB
JavaScript 0% · 2.4 KiB
B
HTTP Caching
no-cache, private
REVIEW
no-cache, private
Info::
Cache-Control header is set
Got: no-cache, private
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-cache, private

DirectiveValueMeaning
no-cache—Cache but always revalidate first
private—Only browser cache, not CDN/proxy
A+
Third-Party Impact
7% third-party, 0 ms blocking
PASS
7% third-party, 0 ms blocking
Info::
Third-party code accounts for 7% of page weight (227.6 KiB of 3.0 MiB)
Info::
Third-party blocking time is low (0 ms)
93%
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+
JS Execution Cost
193ms total JS execution
PASS
193ms total JS execution
Info::
https://sdnegeri4keling.sch.id/: 109ms CPU time
Info::
Unattributable: 85ms CPU time

Main Thread Breakdown

Other 58% Style & Layout 30% Rendering 6% Parse HTML & CSS 3% Script Evaluation 3%
ScriptTotalScriptingParse/CompileParty
https://sdnegeri4keling.sch.id/109ms1ms0ms1st
Unattributable85ms1ms0ms1st
A+
Font Loading
7 fonts (174 KB)
PASS
7 fonts (174 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

174 KB total

Render-blocking

0

of 7

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 FCP 851 ms LCP 3.2 shttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLCz7Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2 — 7.7 KiB — 32 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2pxiEyp8kv8JHgFVrJJfecnF... https://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2 — 7.7 KiB — 33 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLGT9Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLGT9Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLGT9Z1xlFd2JQEk.woff2 — 7.6 KiB — 35 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLDD4Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLDD4Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLDD4Z1xlFd2JQEk.woff2 — 7.7 KiB — 43 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLDz8Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLDz8Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLDz8Z1xlFd2JQEk.woff2 — 7.7 KiB — 46 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLEj6Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2 — 7.8 KiB — 49 ms — font-display: swaphttps://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/fonts/bootstrap-icons.woff2?dd67030699838ea613ee6dbda90effa6bootstrap-icons.woff2 https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/fonts/bootstrap-icons.woff2?dd67030699838ea613ee6dbda90effa6 — 128.1 KiB — 96 ms — font-display: swap
pxiByp8kv8JHgFVrLCz7Z1x... woff2 swap
Size 8 KB
Load time 32 ms
Start 787 ms
Risk FOUT — text flashes from fallback to web font
pxiEyp8kv8JHgFVrJJfecnF... woff2 swap
Size 8 KB
Load time 33 ms
Start 788 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLGT9Z1x... woff2 swap
Size 8 KB
Load time 35 ms
Start 790 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLDD4Z1x... woff2 swap
Size 8 KB
Load time 43 ms
Start 791 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLDz8Z1x... woff2 swap
Size 8 KB
Load time 46 ms
Start 791 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLEj6Z1x... woff2 swap
Size 8 KB
Load time 49 ms
Start 791 ms
Risk FOUT — text flashes from fallback to web font
bootstrap-icons.woff2 woff2 swap
Size 128 KB
Load time 96 ms
Start 792 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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)

Fixing the unchecked items could save ~64 KB and ~128 ms

A+
JS Bundles
2 scripts, 0 KB unused
PASS
2 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://sdnegeri4keling.sch.id/build/assets/app-CEZjJM0N.js1 KB—✓1st
https://sdnegeri4keling.sch.id/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js1 KB—✓1st
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+
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+
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, private
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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

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
24 requests over 1747ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 851 ms LCP 3.2 shttps://sdnegeri4keling.sch.id// https://sdnegeri4keling.sch.id/ — 200 — 5.7 KiB — 635 ms — h3https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800&display=swapfonts.googleapis.com/css2?family=Po... https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800&display=swap — 200 — 1.1 KiB — 102 ms — h2https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/bootstrap-icons.min.csscdn.jsdelivr.net/npm/bootstrap-icon... https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/bootstrap-icons.min.css — 200 — 13.8 KiB — 84 ms — h2https://sdnegeri4keling.sch.id/build/assets/app-BJZmncW6.css/build/assets/app-BJZmncW6.css https://sdnegeri4keling.sch.id/build/assets/app-BJZmncW6.css — 200 — 7.0 KiB — 26 ms — h3https://sdnegeri4keling.sch.id/build/assets/app-CEZjJM0N.js/build/assets/app-CEZjJM0N.js https://sdnegeri4keling.sch.id/build/assets/app-CEZjJM0N.js — 200 — 1.3 KiB — 46 ms — h3https://sdnegeri4keling.sch.id/images/logo%20sd%20negeri%204%20keling.png/images/logo%20sd%20negeri%204%20ke... https://sdnegeri4keling.sch.id/images/logo%20sd%20negeri%204%20keling.png — 200 — 261.0 KiB — 120 ms — h3https://sdnegeri4keling.sch.id/uploads/hero-slide/9NaR1qqOAfa252lWnBKowchJn5zvJ6A4KdS9cyp9.jpg/uploads/hero-slide/9NaR1qqOAfa252l... https://sdnegeri4keling.sch.id/uploads/hero-slide/9NaR1qqOAfa252lWnBKowchJn5zvJ6A4KdS9cyp9.jpg — 200 — 395.3 KiB — 131 ms — h3https://sdnegeri4keling.sch.id/uploads/hero-slide/w304xFP3HXCXlqmd8sdCY7SntvskZqGW8NA0CSYJ.jpg/uploads/hero-slide/w304xFP3HXCXlqm... https://sdnegeri4keling.sch.id/uploads/hero-slide/w304xFP3HXCXlqmd8sdCY7SntvskZqGW8NA0CSYJ.jpg — 200 — 185.1 KiB — 99 ms — h3https://sdnegeri4keling.sch.id/uploads/hero-slide/0ZFOS3EeKZZTuOMKpk78FmvAhBxituaeJJjDzIvi.jpg/uploads/hero-slide/0ZFOS3EeKZZTuOM... https://sdnegeri4keling.sch.id/uploads/hero-slide/0ZFOS3EeKZZTuOMKpk78FmvAhBxituaeJJjDzIvi.jpg — 200 — 61.6 KiB — 89 ms — h3https://sdnegeri4keling.sch.id/uploads/hero-slide/q39qhnCV0jNaBM9MSlN7VLDDDWpEkE4K4xVGN47l.jpg/uploads/hero-slide/q39qhnCV0jNaBM9... https://sdnegeri4keling.sch.id/uploads/hero-slide/q39qhnCV0jNaBM9MSlN7VLDDDWpEkE4K4xVGN47l.jpg — 200 — 80.8 KiB — 93 ms — h3https://sdnegeri4keling.sch.id/uploads/hero-slide/eTzLmeDiDazfnkeLGhoWtg8XcNcUmVCI5TkVICzG.jpg/uploads/hero-slide/eTzLmeDiDazfnke... https://sdnegeri4keling.sch.id/uploads/hero-slide/eTzLmeDiDazfnkeLGhoWtg8XcNcUmVCI5TkVICzG.jpg — 200 — 1.2 MiB — 182 ms — h3https://sdnegeri4keling.sch.id/uploads/hero-slide/aPIdRtuyxWXgYzVPhVWS6sMbDjaiDhrIsxhY5fQh.jpg/uploads/hero-slide/aPIdRtuyxWXgYzV... https://sdnegeri4keling.sch.id/uploads/hero-slide/aPIdRtuyxWXgYzVPhVWS6sMbDjaiDhrIsxhY5fQh.jpg — 200 — 191.6 KiB — 111 ms — h3https://sdnegeri4keling.sch.id/images/potoanaksd.png/images/potoanaksd.png https://sdnegeri4keling.sch.id/images/potoanaksd.png — 200 — 413.1 KiB — 130 ms — h3https://akcdn.detik.net.id/community/media/visual/2026/07/22/presiden-prabowo-melantik-sudaryono-jadi-kepala-bgn-donny-ermawan-gubernur-universitas-republik-indonesia-dan-yos-sunitiyoso-s-1784715052589_169.jpeg?w=360&q=90akcdn.detik.net.id/community/media/... https://akcdn.detik.net.id/community/media/visual/2026/07/22/presiden-prabowo-melantik-sudaryono-jadi-kepala-bgn-donny-ermawan-gubernur-universitas-republik-indonesia-dan-yos-sunitiyoso-s-1784715052589_169.jpeg?w=360&q=90 — 200 — 17.9 KiB — 1.1 s — h2https://akcdn.detik.net.id/community/media/visual/2026/07/22/marsekal-purn-donny-ermawan-taufanto-dilantik-sebagai-gubernur-universitas-republik-indonesia-1784709766397_169.jpeg?w=360&q=90akcdn.detik.net.id/community/media/... https://akcdn.detik.net.id/community/media/visual/2026/07/22/marsekal-purn-donny-ermawan-taufanto-dilantik-sebagai-gubernur-universitas-republik-indonesia-1784709766397_169.jpeg?w=360&q=90 — 200 — 20.6 KiB — 1.1 s — h2https://sdnegeri4keling.sch.id/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js/cdn-cgi/scripts/5c5dd728/cloudflar... https://sdnegeri4keling.sch.id/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js — 200 — 1.0 KiB — 45 ms — h3https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2fonts.gstatic.com/s/poppins/v24/pxi... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2 — 200 — 7.7 KiB — 32 ms — h3https://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2fonts.gstatic.com/s/poppins/v24/pxi... https://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2 — 200 — 7.7 KiB — 33 ms — h3https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLGT9Z1xlFd2JQEk.woff2fonts.gstatic.com/s/poppins/v24/pxi... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLGT9Z1xlFd2JQEk.woff2 — 200 — 7.6 KiB — 35 ms — h3https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLDD4Z1xlFd2JQEk.woff2fonts.gstatic.com/s/poppins/v24/pxi... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLDD4Z1xlFd2JQEk.woff2 — 200 — 7.7 KiB — 43 ms — h3https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLDz8Z1xlFd2JQEk.woff2fonts.gstatic.com/s/poppins/v24/pxi... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLDz8Z1xlFd2JQEk.woff2 — 200 — 7.7 KiB — 46 ms — h3https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2fonts.gstatic.com/s/poppins/v24/pxi... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2 — 200 — 7.8 KiB — 49 ms — h3https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/fonts/bootstrap-icons.woff2?dd67030699838ea613ee6dbda90effa6cdn.jsdelivr.net/npm/bootstrap-icon... https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/fonts/bootstrap-icons.woff2?dd67030699838ea613ee6dbda90effa6 — 200 — 128.1 KiB — 96 ms — h3https://sdnegeri4keling.sch.id/favicon.ico/favicon.ico https://sdnegeri4keling.sch.id/favicon.ico — 200 — 497 B — 39 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization
11 images, 3086 KB total, 1796 KB wasted
INFO

Image Optimization Audit

Total Images

11

Total Size

3086 KB

Oversized

3

Wasted

1796 KB

11 missing dimensions 4 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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