https://rcf-community.com
Performance
· 25 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
84
GRADE
B
FIX
4
REVIEW
6
PASS
13
INFO
2
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
72
53
92
100
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
2.16 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
19.40 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.
0.064
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.58 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.
19.40 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 sChecks
2513 PASS 6 REVIEW 4 FIX
FPage Weight BudgetAction4.9 MB transferred, 133 requestsFIX
Page Weight Budget
Action4.9 MB transferred, 133 requests
4.9 MB transferred, 133 requests
Critical::
Page weighs 5.8 MB (4.9 MB transferred)
Warning::
Images are 4.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.3 MB
Info::
Fonts are 346 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 346 KB
Warning::
133 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.0 g CO2 per page load
4.9 MB transferred
133 requests
1.0 g CO2 per page load
Images 4.3 MiB 88%
Fonts 346.0 KiB 7%
JavaScript 148.7 KiB 3%
CSS 54.2 KiB 1%
Other 22.9 KiB 0%
HTML 14.8 KiB 0%
Other 412 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
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Why this matters
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction63% third-party, 0 ms blockingFIX
Third-Party Impact
Action63% third-party, 0 ms blocking
63% third-party, 0 ms blocking
Warning::
Third-party code accounts for 63% of page weight (3.1 MiB of 4.9 MiB)
Info::
Third-party blocking time is low (0 ms)
37%
63%
First-party Third-party
DPage Weight InventoryAction133 resources · 4.9 MB · 22 KB savings availableFIX
Page Weight Inventory
Action133 resources · 4.9 MB · 22 KB savings available
133 resources · 4.9 MB · 22 KB savings available
Warning::
Page weight 4.9 MB exceeds 1 MB target by 3.9 MB
Got: 4.9 MB Expected: ≤ 1 MB
Warning::
113 third-party resources (63% of weight)
Info::
3 resources over 200KB
133 resources · 4.9 MiB · 113 third-party 3.9 MiB over 1MB target
Image 88% · 4.3 MiB
Font 7% · 346.0 KiB
JavaScript 3% · 148.7 KiB
CSS 1% · 54.2 KiB
Document 0% · 19.8 KiB
Other 0% · 18.3 KiB
~22.0 KiB of savings available
Remove unused JavaScript: 22.0 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 133 resources | 4.9 MiB | ||||||
DHTTP CachingActionno-store (uncacheable)FIX
HTTP Caching
Actionno-store (uncacheable)
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
| Directive | Value | Meaning |
|---|---|---|
| no-store | — | Never cache this response |
| no-cache | — | Cache but always revalidate first |
| must-revalidate | — | Must recheck with server after expiry |
BImage Optimization106 images, 0 KB saveableREVIEW
Image Optimization
106 images, 0 KB saveable
106 images, 0 KB saveable
Warning::
https://rcf-community.com/images/RCF-anim-test1.gi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
106 images 4.3 MB
0 oversized -0 KB
106 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
BJS Execution Cost624ms total JS executionREVIEW
JS Execution Cost
624ms total JS execution
624ms total JS execution
Warning::
https://rcf-community.com/: 384ms CPU time
Info::
Unattributable: 240ms CPU time
Main Thread Breakdown
Other 49% Style & Layout 26% Script Evaluation 12% Parse HTML & CSS 6% Script Parsing & Compilation 4% Rendering 3%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://rcf-community.com/ | 384ms | 27ms | 5ms | 1st |
| Unattributable | 240ms | 7ms | 0ms | 1st |
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
HTTP/3 (QUIC)
HTTP/3 not advertised
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.
BCompression AlgorithmMain response uses gzip; brotli would be ~20% smallerREVIEW
Compression Algorithm
Main response uses gzip; brotli would be ~20% smaller
Main 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.
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
Server-Timing Observability
No Server-Timing header found
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.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
Text Compression
All text resources are compressed
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+Font Loading7 fonts (346 KB)PASS
Font Loading
7 fonts (346 KB)
7 fonts (346 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
7
346 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
EdgeOfTheGalaxyPoster.ttf ttf swap
Size 6 KB
Load time 598 ms
Start 2.3 s
Risk FOUT — text flashes from fallback to web font
- Convert to woff2 for ~30% smaller file size
AGENCYR.TTF ttf swap
Size 36 KB
Load time 721 ms
Start 2.3 s
Risk FOUT — text flashes from fallback to web font
- Convert to woff2 for ~30% smaller file size
AGENCYB.TTF ttf swap
Size 37 KB
Load time 710 ms
Start 2.3 s
Risk FOUT — text flashes from fallback to web font
- Convert to woff2 for ~30% smaller file size
LemonMilkRegular-X3XE2.otf otf swap
Size 24 KB
Load time 720 ms
Start 2.3 s
Risk FOUT — text flashes from fallback to web font
- Convert to woff2 for ~30% smaller file size
Trekbats.ttf ttf swap
Size 27 KB
Load time 708 ms
Start 2.3 s
Risk FOUT — text flashes from fallback to web font
- Convert to woff2 for ~30% smaller file size
66d715454104d24e.woff2 woff2 swap
Size 38 KB
Load time 38 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
f72b5ce64feb2086.woff2 woff2 swap
Size 178 KB
Load time 51 ms
Start 2.7 s
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 ~128 KB and ~256 ms
A+JS Bundles6 scripts, 22 KB unusedPASS
JS Bundles
6 scripts, 22 KB unused
6 scripts, 22 KB unused
Warning::
https://rcf-community.com/js/jquery-3.6.0.min.js: 22 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 22 KB
22 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://rcf-community.com/js/jquery-3.6.0.min.js | 30 KB | 22 KB (73%) | ✓ | 1st |
| https://www.gstatic.com/charts/loader.js | 19 KB | — | ✓ | 3rd |
| https://rcf-community.com/js/shadowbox.js | 19 KB | — | ✓ | 1st |
| https://rcf-community.com/js/html.js | 0 KB | — | ✓ | 1st |
| https://discord.com/assets/c114e7c6ec68f068.js | 71 KB | — | ✓ | 3rd |
| https://discord.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/e694063b5082/main.js? | 10 KB | — | ✓ | 3rd |
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
A+Resource CachingAll resources properly cachedPASS
Resource Caching
All resources properly cached
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+Critical Rendering PathNo render-blocking resourcesPASS
Critical Rendering Path
No render-blocking resources
No render-blocking resources
Info::
No render-blocking resources detected
A+Resource HintsNo optimization neededPASS
Resource Hints
No optimization needed
No optimization needed
Info::
No resource hint issues
A+LCP Image PreloadLCP preload audit not availablePASS
LCP Image Preload
LCP preload audit not available
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+Main HTML Cache-ControlMain HTML uses no-store -- correct for sensitive/dynamic contentPASS
Main HTML Cache-Control
Main HTML uses no-store -- correct for sensitive/dynamic content
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 Intelligence2 server-response signal(s) detectedPASS
Server Response Intelligence
2 server-response signal(s) detected
2 server-response signal(s) detected
Info::
`Vary` header declared: Accept-Encoding,User-Agent
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+Render-Blocking ResourcesNo render-blocking resources detectedPASS
Render-Blocking Resources
No render-blocking resources detected
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+Third-Party ResourcesNo third-party resources detectedPASS
Third-Party Resources
No third-party resources detected
No third-party resources detected
AJavaScript Blocking1 JS blocking issue(s) detectedPASS
JavaScript Blocking
1 JS blocking issue(s) detected
1 JS blocking issue(s) detected
Warning::
4 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 DepthNo CSS performance depth issues detectedPASS
CSS Performance Depth
No CSS performance depth issues detected
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
Network Waterfall133 requests over 3201msINFO
Network Waterfall
133 requests over 3201ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization2 images, 259 KB total, 192 KB wastedINFO
Image Optimization
2 images, 259 KB total, 192 KB wasted
Image Optimization Audit
Total Images
2
Total Size
259 KB
Oversized
1
Wasted
192 KB
1 missing dimensions 1 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.