Skip to content
https://aryanworldwide.github.io/Robocraft

Performance

· 21 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
90
GRADE
A
FIX
2
REVIEW
5
PASS
12
INFO
2

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

Mobile Desktop
98
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
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.

823 ms

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

1.04 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.

823 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.

1.04 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
21
12 PASS 5 REVIEW 2 FIX
D
JS Bundles
Action
5 scripts, 159 KB unused
FIX
5 scripts, 159 KB unused
Warning::
https://aryanworldwide.github.io/Robocraft/assets/...: 82 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://aryanworldwide.github.io/Robocraft/assets/...: unminified — 25 KB could be saved
Warning::
https://aryanworldwide.github.io/Robocraft/assets/...: 57 KB unused (15%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://aryanworldwide.github.io/Robocraft/assets/...: 20 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://aryanworldwide.github.io/Robocraft/assets/...: unminified — 14 KB could be saved
Info::
Total unused JavaScript: 159 KB
159 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://aryanworldwide.github.io/Robocraft/assets/index.esm-CYcYzvKZ.js111 KB82 KB (74%)✗1st
https://aryanworldwide.github.io/Robocraft/assets/index-CIPckq2K.js372 KB57 KB (15%)✓1st
https://aryanworldwide.github.io/Robocraft/assets/index.esm-bzsF7JfD.js39 KB20 KB (52%)✗1st
https://aryanworldwide.github.io/Robocraft/assets/index.esm-CIdH0ruJ.js1 KB—✓1st
https://aryanworldwide.github.io/Robocraft/assets/index.esm2017-DM8SyFG4.js13 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

F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

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.
C
Document Compression
Action
Document response served uncompressed
REVIEW
Document response served uncompressed
Info::
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
B
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
No Cache-Control header on main HTML response
Info::
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
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
565 KB transferred, 13 requests
PASS
565 KB transferred, 13 requests
Info::
Page weighs 1.9 MB (565 KB transferred)
Warning::
JavaScript is 536 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 536 KB
Info::
13 HTTP requests
Info::
Estimated 0.12 g CO2 per page load
565 KB / 2.4 MB budget
565 KB transferred
13 requests
0.12 g CO2 per page load
JavaScript 536.0 KiB 95%
CSS 19.4 KiB 3%
Other 8.3 KiB 1%
HTML 931 B 0%
Other 692 B 0%
Fonts 0 B 0%
0 2.4 MB 4.9 MB
Under budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

A+
Third-Party Impact
0% third-party, 0 ms blocking
PASS
0% third-party, 0 ms blocking
Info::
Third-party code accounts for 0% of page weight (1.3 KiB of 565.3 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
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+
Image Optimization
No images on this page
PASS
No images on this page
Info::
No images on this page
0 images 0 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
235ms total JS execution
PASS
235ms total JS execution
Info::
https://aryanworldwide.github.io/Robocraft/: 143ms CPU time
Info::
Unattributable: 92ms CPU time

Main Thread Breakdown

Other 48% Script Evaluation 23% Style & Layout 19% Rendering 7%
ScriptTotalScriptingParse/CompileParty
https://aryanworldwide.github.io/Robocraft/143ms15ms0ms1st
Unattributable92ms9ms0ms1st
A+
Font Loading
1 fonts (0 KB)
PASS
1 fonts (0 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

0 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 FCP 823 ms LCP 1.0 shttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2UcC73FwrK3iLTeHuS_nVMrM... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 0 B — 96 ms — font-display: swap
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 0 KB
Load time 96 ms
Start 349 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+
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
13 resources · 565 KB · 159 KB savings available
PASS
13 resources · 565 KB · 159 KB savings available
Info::
Within 1MB page-weight target
Got: 565 KB
Info::
~159 KB of savings available
Info::
2 third-party resources (0% of weight)
Info::
1 resources over 200KB
13 resources · 565.3 KiB · 2 third-party Within 1MB page-weight target
JavaScript 95% · 536.0 KiB
CSS 3% · 19.4 KiB
Image 1% · 8.0 KiB
Document 0% · 1.2 KiB
Other 0% · 692 B
Font 0% · 0 B

~158.8 KiB of savings available

Remove unused JavaScript: 158.8 KiB
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
13 requests over 445ms
INFO
0 ms 500 ms 1.0 s FCP 823 ms LCP 1.0 shttps://aryanworldwide.github.io/Robocraft/Robocraft https://aryanworldwide.github.io/Robocraft — 301 — 329 B — 7 ms — h2https://aryanworldwide.github.io/Robocraft//Robocraft/ https://aryanworldwide.github.io/Robocraft/ — 200 — 931 B — 2 ms — h2https://aryanworldwide.github.io/Robocraft/assets/index-CIPckq2K.js/Robocraft/assets/index-CIPckq2K.js https://aryanworldwide.github.io/Robocraft/assets/index-CIPckq2K.js — 200 — 372.3 KiB — 23 ms — h2https://aryanworldwide.github.io/Robocraft/assets/index-BAWb_9pj.css/Robocraft/assets/index-BAWb_9pj.cs... https://aryanworldwide.github.io/Robocraft/assets/index-BAWb_9pj.css — 200 — 18.1 KiB — 4 ms — h2https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swapfonts.googleapis.com/css2?family=In... https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap — 200 — 1.3 KiB — 141 ms — h2https://aryanworldwide.github.io/Robocraft/manifest.json/Robocraft/manifest.json https://aryanworldwide.github.io/Robocraft/manifest.json — 200 — 692 B — 6 ms — h2https://aryanworldwide.github.io/Robocraft/assets/index.esm-CIdH0ruJ.js/Robocraft/assets/index.esm-CIdH0ru... https://aryanworldwide.github.io/Robocraft/assets/index.esm-CIdH0ruJ.js — 200 — 952 B — 4 ms — h2https://aryanworldwide.github.io/Robocraft/assets/index.esm2017-DM8SyFG4.js/Robocraft/assets/index.esm2017-DM8... https://aryanworldwide.github.io/Robocraft/assets/index.esm2017-DM8SyFG4.js — 200 — 12.8 KiB — 5 ms — h2https://aryanworldwide.github.io/Robocraft/assets/index.esm-bzsF7JfD.js/Robocraft/assets/index.esm-bzsF7Jf... https://aryanworldwide.github.io/Robocraft/assets/index.esm-bzsF7JfD.js — 200 — 39.1 KiB — 6 ms — h2https://aryanworldwide.github.io/Robocraft/assets/index.esm-CYcYzvKZ.js/Robocraft/assets/index.esm-CYcYzvK... https://aryanworldwide.github.io/Robocraft/assets/index.esm-CYcYzvKZ.js — 200 — 110.9 KiB — 15 ms — h2https://aryanworldwide.github.io/Robocraft/favicon.svg/Robocraft/favicon.svg https://aryanworldwide.github.io/Robocraft/favicon.svg — 200 — 603 B — 6 ms — h2https://aryanworldwide.github.io/Robocraft/icon-192.png/Robocraft/icon-192.png https://aryanworldwide.github.io/Robocraft/icon-192.png — 200 — 7.4 KiB — 7 ms — h2https://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 — 0 B — 96 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback