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https://sblob.it

Performance

· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
92
GRADE
A
FIX
1
REVIEW
6
PASS
13
INFO
2

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.
78
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.

1.64 s

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

2.17 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.

1.64 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.

2.17 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
22
13 PASS 6 REVIEW 1 FIX
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store, no-cache, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store, no-cache, must-revalidate

DirectiveValueMeaning
no-store—Never cache this response
no-cache—Cache but always revalidate first
must-revalidate—Must recheck with server after expiry
B
Image Optimization
6 images, 0 KB saveable
REVIEW
6 images, 0 KB saveable
Warning::
https://sblob.it/assets/images/sblob-logo.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
6 images 131 KB
0 oversized -0 KB
3 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
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
Asset Compression
1 of 1 asset host serve text uncompressed
REVIEW
1 of 1 asset host serve text uncompressed
Warning::
fonts.googleapis.com serves text assets uncompressed (assets: 4)
The sampled response carries a text content type but no Content-Encoding, so the bytes go over the wire raw. Text compression typically removes 70-80% of a JS or CSS payload -- this is the single cheapest transfer win available on this host.
Got: fonts.googleapis.com (text/css)
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
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
204 KB transferred, 18 requests
PASS
204 KB transferred, 18 requests
Info::
Page weighs 261 KB (204 KB transferred)
Info::
18 HTTP requests
Info::
Estimated 0.04 g CO2 per page load
204 KB / 2.4 MB budget
204 KB transferred
18 requests
0.04 g CO2 per page load
Images 130.5 KiB 64%
Fonts 45.0 KiB 22%
CSS 8.5 KiB 4%
HTML 7.4 KiB 4%
JavaScript 6.0 KiB 3%
Other 4.4 KiB 2%
Other 1.1 KiB 1%
Other 766 B 0%
0 2.4 MB 4.9 MB
Under budget
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 (46.2 KiB of 203.7 KiB)
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+
JS Execution Cost
184ms total JS execution
PASS
184ms total JS execution
Info::
https://sblob.it/: 124ms CPU time
Info::
Unattributable: 60ms CPU time

Main Thread Breakdown

Style & Layout 42% Other 40% Rendering 8% Script Evaluation 7%
ScriptTotalScriptingParse/CompileParty
https://sblob.it/124ms2ms1ms1st
Unattributable60ms3ms0ms1st
A+
Font Loading
1 fonts (45 KB)
PASS
1 fonts (45 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

45 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 500 ms 1.0 s 1.5 s 2.0 s FCP 1.6 s LCP 2.2 shttps://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQk6YvM.woff2ieVl2ZhZI2eCN5jzbjEETS9... https://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQk6YvM.woff2 — 45.0 KiB — 17 ms — font-display: swap
ieVl2ZhZI2eCN5jzbjEETS9... woff2 swap
Size 45 KB
Load time 17 ms
Start 1.2 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+
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://sblob.it/assets/js/main.js?v=35 KB—✓1st
https://sblob.it/assets/js/auth.js?v=11 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+
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-store -- correct for sensitive/dynamic content
PASS
Main HTML uses no-store -- correct for sensitive/dynamic content
Info::
Main HTML uses no-store -- correct for sensitive/dynamic content
Got: no-store, no-cache, must-revalidate
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::
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+
Page Weight Inventory
18 resources · 204 KB · 0 KB savings available
PASS
18 resources · 204 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 204 KB
Info::
2 third-party resources (23% of weight)
18 resources · 203.7 KiB · 2 third-party Within 1MB page-weight target
Image 66% · 134.9 KiB
Font 22% · 45.0 KiB
CSS 4% · 8.5 KiB
Document 4% · 7.4 KiB
JavaScript 3% · 6.0 KiB
Other 1% · 1.9 KiB
Network Waterfall
18 requests over 2237ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.6 s LCP 2.2 shttps://sblob.it// https://sblob.it/ — 200 — 7.4 KiB — 854 ms — http/1.1https://fonts.googleapis.com/css2?family=Roboto+Condensed:wght@400;700&display=swapfonts.googleapis.com/css2?family=Ro... https://fonts.googleapis.com/css2?family=Roboto+Condensed:wght@400;700&display=swap — 200 — 1.1 KiB — 168 ms — h2https://sblob.it/assets/css/main.css?v=3/assets/css/main.css?v=3 https://sblob.it/assets/css/main.css?v=3 — 200 — 4.4 KiB — 228 ms — http/1.1https://sblob.it/assets/css/sblob.css?v=2/assets/css/sblob.css?v=2 https://sblob.it/assets/css/sblob.css?v=2 — 200 — 3.0 KiB — 227 ms — http/1.1https://sblob.it/assets/images/sblob-logo.png/assets/images/sblob-logo.png https://sblob.it/assets/images/sblob-logo.png — 200 — 6.0 KiB — 456 ms — http/1.1https://sblob.it/assets/js/main.js?v=3/assets/js/main.js?v=3 https://sblob.it/assets/js/main.js?v=3 — 200 — 4.6 KiB — 454 ms — http/1.1https://sblob.it/assets/js/auth.js?v=1/assets/js/auth.js?v=1 https://sblob.it/assets/js/auth.js?v=1 — 200 — 1.4 KiB — 664 ms — http/1.1https://sblob.it/manifest.json/manifest.json https://sblob.it/manifest.json — 200 — 766 B — 663 ms — http/1.1https://sblob.it/api/pixel?p=%2F&r=/api/pixel?p=%2F&r= https://sblob.it/api/pixel?p=%2F&r= — 200 — 532 B — 449 ms — http/1.1https://sblob.it/assets/images/placeholder.svg/assets/images/placeholder.svg https://sblob.it/assets/images/placeholder.svg — 200 — 527 B — 444 ms — http/1.1https://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQk6YvM.woff2fonts.gstatic.com/s/robotocondensed... https://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQk6YvM.woff2 — 200 — 45.0 KiB — 17 ms — h3https://sblob.it/api/auth?action=me/api/auth?action=me https://sblob.it/api/auth?action=me — 200 — 568 B — 229 ms — http/1.1https://sblob.it/api/auth?action=me/api/auth?action=me https://sblob.it/api/auth?action=me — 200 — 568 B — 459 ms — http/1.1https://sblob.it/assets/images/cache/c54dde10f0f511e421ac4b54b9a873cd.webp/assets/images/cache/c54dde10f0f511... https://sblob.it/assets/images/cache/c54dde10f0f511e421ac4b54b9a873cd.webp — 200 — 7.1 KiB — 232 ms — http/1.1https://sblob.it/assets/images/cache/7f904b1e7ce4e47701a4a928d336187c.webp/assets/images/cache/7f904b1e7ce4e4... https://sblob.it/assets/images/cache/7f904b1e7ce4e47701a4a928d336187c.webp — 200 — 96.6 KiB — 661 ms — http/1.1https://sblob.it/assets/images/cache/db4a3407e32b4784b98b315b6e85beb3.webp/assets/images/cache/db4a3407e32b47... https://sblob.it/assets/images/cache/db4a3407e32b4784b98b315b6e85beb3.webp — 200 — 19.7 KiB — 442 ms — http/1.1https://sblob.it/assets/images/favicon.png/assets/images/favicon.png https://sblob.it/assets/images/favicon.png — 200 — 1.4 KiB — 223 ms — http/1.1https://sblob.it/assets/images/icon-192.png/assets/images/icon-192.png https://sblob.it/assets/images/icon-192.png — 200 — 3.1 KiB — 406 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization
2 images, 11 KB total, 5 KB wasted
INFO

Image Optimization Audit

Total Images

2

Total Size

11 KB

Oversized

1

Wasted

5 KB

2 missing dimensions
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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