Skip to content
https://poechallenges.cc

Performance

· 24 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
93
GRADE
A
FIX
1
REVIEW
4
PASS
18
INFO
1

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

Mobile Desktop
76
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
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.

1.18 s

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

3.14 s

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

704 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.

1.88 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.

3.31 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
24
18 PASS 4 REVIEW 1 FIX
D
JS Execution Cost
Action
2125ms total JS execution
FIX
2125ms total JS execution
Warning::
https://poechallenges.cc/_next/static/chunks/12x_t...: 1129ms CPU time
Warning::
https://poechallenges.cc/: 627ms CPU time
Warning::
Unattributable: 285ms CPU time
Info::
https://poechallenges.cc/_next/static/chunks/09kzy...: 83ms CPU time

Main Thread Breakdown

Script Evaluation 48% Style & Layout 19% Other 18% Rendering 6% Script Parsing & Compilation 4% Garbage Collection 3%
ScriptTotalScriptingParse/CompileParty
https://poechallenges.cc/_next/static/chunks/12x_tm5bu80z2.js1129ms1010ms21ms1st
https://poechallenges.cc/627ms5ms24ms1st
Unattributable285ms11ms0ms1st
https://poechallenges.cc/_next/static/chunks/09kzygh-9mhpc.js83ms5ms14ms1st
B
JS Bundles
6 scripts, 55 KB unused
REVIEW
6 scripts, 55 KB unused
Warning::
https://poechallenges.cc/_next/static/chunks/14nk-...: 30 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://poechallenges.cc/_next/static/chunks/12x_t...: 25 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 55 KB
55 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://poechallenges.cc/_next/static/chunks/14nk-k_8h9ywg.js49 KB30 KB (61%)✓1st
https://poechallenges.cc/_next/static/chunks/12x_tm5bu80z2.js70 KB25 KB (36%)✓1st
https://poechallenges.cc/_next/static/chunks/073m0nq8aby5v.js7 KB—✓1st
https://poechallenges.cc/_next/static/chunks/turbopack-10e-4pr1lpam5.js4 KB—✓1st
https://poechallenges.cc/_next/static/chunks/00ck~hdkoj11u.js14 KB—✓1st
https://poechallenges.cc/_next/static/chunks/09kzygh-9mhpc.js49 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

B
Main HTML Cache-Control
Cache-Control present but without max-age
REVIEW
Cache-Control present but without max-age
Info::
Main HTML Cache-Control has no max-age: s-maxage=31536000
Got: s-maxage=31536000
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
HTTP Caching
s-maxage=31536000
REVIEW
s-maxage=31536000
Info::
Cache-Control header is set
Got: s-maxage=31536000
Info::
CDN TTL: 52 weeks (s-maxage=31536000)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

s-maxage=31536000

DirectiveValueMeaning
s-maxage31536000CDN caches for 52 weeks
A+
Page Weight Budget
358 KB transferred, 24 requests
PASS
358 KB transferred, 24 requests
Info::
Page weighs 1.1 MB (358 KB transferred)
Info::
24 HTTP requests
Info::
Estimated 0.07 g CO2 per page load
358 KB / 2.4 MB budget
358 KB transferred
24 requests
0.07 g CO2 per page load
JavaScript 193.3 KiB 54%
Fonts 73.3 KiB 20%
HTML 44.3 KiB 12%
Other 36.7 KiB 10%
CSS 8.9 KiB 2%
Other 1.2 KiB 0%
Images 0 B 0%
0 2.4 MB 4.9 MB
Under budget
A+
Third-Party Impact
No third-party resources
PASS
No third-party resources
Info::
No third-party resources detected
No third-party resources detected — all resources are first-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
3 images, 0 KB saveable
PASS
3 images, 0 KB saveable
Info::
All images are well-optimized
3 images 0 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
2 fonts (73 KB)
PASS
2 fonts (73 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

73 KB total

Render-blocking

0

of 2

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 1.2 s LCP 3.1 shttps://poechallenges.cc/_next/static/media/83afe278b6a6bb3c-s.p.0q-301v4kxxnr.woff283afe278b6a6bb3c-s.p.0q... https://poechallenges.cc/_next/static/media/83afe278b6a6bb3c-s.p.0q-301v4kxxnr.woff2 — 47.7 KiB — 138 ms — font-display: swaphttps://poechallenges.cc/_next/static/media/cc014fcb166cf364-s.p.0rbrcy8kuidpb.woff2cc014fcb166cf364-s.p.0r... https://poechallenges.cc/_next/static/media/cc014fcb166cf364-s.p.0rbrcy8kuidpb.woff2 — 25.6 KiB — 137 ms — font-display: swap
83afe278b6a6bb3c-s.p.0q... woff2 swap
Size 48 KB
Load time 138 ms
Start 156 ms
Risk FOUT — text flashes from fallback to web font
cc014fcb166cf364-s.p.0r... woff2 swap
Size 26 KB
Load time 137 ms
Start 157 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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Warning::
2 font preload(s) missing `crossorigin` -- font will be downloaded twice
Fonts are always fetched as crossorigin=anonymous; a preload without the attribute creates a different cache key, so the browser refetches when the actual font request happens. Sample: /_next/static/media/83afe278b6a6bb3c-s.p.0q-301v4kxxnr.woff2, /_next/static/media/cc014fcb166cf364-s.p.0rbrcy8kuidpb.woff2. Add `crossorigin` (or `crossorigin="anonymous"`) to each preload.
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
—
preload
3
dns-prefetch
—
prefetch
—

3 resource hints configured

Fonts are always fetched as crossorigin=anonymous; a preload without the attribute creates a different cache key, so the browser refetches when the actual font request happens. Sample: /_next/static/media/83afe278b6a6bb3c-s.p.0q-301v4kxxnr.woff2, /_next/static/media/cc014fcb166cf364-s.p.0rbrcy8kuidpb.woff2. Add `crossorigin` (or `crossorigin="anonymous"`) to each preload.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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+
Compression Algorithm
Main response uses brotli
PASS
Main 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+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: rsc, next-router-state-tree, next-router-prefetch, next-router-segment-prefetch,...
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
24 resources · 358 KB · 55 KB savings available
PASS
24 resources · 358 KB · 55 KB savings available
Info::
Within 1MB page-weight target
Got: 358 KB
Info::
~55 KB of savings available
Info::
3 third-party resources (0% of weight)
24 resources · 357.6 KiB · 3 third-party Within 1MB page-weight target
JavaScript 54% · 193.3 KiB
Font 20% · 73.3 KiB
Document 12% · 44.3 KiB
Other 10% · 36.7 KiB
CSS 2% · 8.9 KiB
Image 0% · 1.2 KiB

~55.2 KiB of savings available

Remove unused JavaScript: 55.2 KiB
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::
1 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
24 requests over 914ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.2 s LCP 3.1 shttps://poechallenges.cc// https://poechallenges.cc/ — 200 — 44.3 KiB — 123 ms — h2https://poechallenges.cc/_next/static/media/83afe278b6a6bb3c-s.p.0q-301v4kxxnr.woff2/_next/static/media/83afe278b6a6bb3... https://poechallenges.cc/_next/static/media/83afe278b6a6bb3c-s.p.0q-301v4kxxnr.woff2 — 200 — 47.7 KiB — 138 ms — h2https://poechallenges.cc/_next/static/media/cc014fcb166cf364-s.p.0rbrcy8kuidpb.woff2/_next/static/media/cc014fcb166cf36... https://poechallenges.cc/_next/static/media/cc014fcb166cf364-s.p.0rbrcy8kuidpb.woff2 — 200 — 25.6 KiB — 137 ms — h2https://poechallenges.cc/_next/static/chunks/06_x9-rq9m57i.css/_next/static/chunks/06_x9-rq9m57i.... https://poechallenges.cc/_next/static/chunks/06_x9-rq9m57i.css — 200 — 7.6 KiB — 96 ms — h2https://poechallenges.cc/_next/static/chunks/0p5md1k5o82ai.css/_next/static/chunks/0p5md1k5o82ai.... https://poechallenges.cc/_next/static/chunks/0p5md1k5o82ai.css — 200 — 1.3 KiB — 103 ms — h2https://poechallenges.cc/_next/static/chunks/073m0nq8aby5v.js/_next/static/chunks/073m0nq8aby5v.... https://poechallenges.cc/_next/static/chunks/073m0nq8aby5v.js — 200 — 6.8 KiB — 113 ms — h2https://poechallenges.cc/_next/static/chunks/14nk-k_8h9ywg.js/_next/static/chunks/14nk-k_8h9ywg.... https://poechallenges.cc/_next/static/chunks/14nk-k_8h9ywg.js — 200 — 49.5 KiB — 208 ms — h2https://poechallenges.cc/_next/static/chunks/12x_tm5bu80z2.js/_next/static/chunks/12x_tm5bu80z2.... https://poechallenges.cc/_next/static/chunks/12x_tm5bu80z2.js — 200 — 69.8 KiB — 210 ms — h2https://poechallenges.cc/_next/static/chunks/turbopack-10e-4pr1lpam5.js/_next/static/chunks/turbopack-10e-... https://poechallenges.cc/_next/static/chunks/turbopack-10e-4pr1lpam5.js — 200 — 4.4 KiB — 109 ms — h2https://poechallenges.cc/_next/static/chunks/00ck~hdkoj11u.js/_next/static/chunks/00ck~hdkoj11u.... https://poechallenges.cc/_next/static/chunks/00ck~hdkoj11u.js — 200 — 13.8 KiB — 132 ms — h2https://poechallenges.cc/_next/static/chunks/09kzygh-9mhpc.js/_next/static/chunks/09kzygh-9mhpc.... https://poechallenges.cc/_next/static/chunks/09kzygh-9mhpc.js — 200 — 49.0 KiB — 208 ms — h2data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='…www.w3.org/2000/svg'%3E%3Cfilter id... data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='… — 200 — 0 B — 0 ms — datahttps://poechallenges.cc/api/auth/me/api/auth/me https://poechallenges.cc/api/auth/me — 200 — 962 B — 51 ms — h3data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' xmlns='http://www.w3.org/2000/sv…www.w3.org/2000/sv… data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' xmlns='http://www.w3.org/2000/sv… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg width='8' height='5' viewBox='0 0 8 5' xmlns='http://www.w3.org/2000/svg'…www.w3.org/2000/svg'… data:image/svg+xml,%3Csvg width='8' height='5' viewBox='0 0 8 5' xmlns='http://www.w3.org/2000/svg'… — 200 — 0 B — 0 ms — datahttps://poechallenges.cc/icon.svg?icon.0lfgzkjxnnzsx.svg/icon.svg?icon.0lfgzkjxnnzsx.svg https://poechallenges.cc/icon.svg?icon.0lfgzkjxnnzsx.svg — 200 — 1.2 KiB — 236 ms — h3https://poechallenges.cc/api/prices?league=Allflame&endpoint=exchange&type=Ducat/api/prices?league=Allflame&endpoin... https://poechallenges.cc/api/prices?league=Allflame&endpoint=exchange&type=Ducat — 200 — 1.5 KiB — 215 ms — h3https://poechallenges.cc/api/prices?league=Allflame&endpoint=currencyoverview&type=Currency/api/prices?league=Allflame&endpoin... https://poechallenges.cc/api/prices?league=Allflame&endpoint=currencyoverview&type=Currency — 200 — 18.1 KiB — 236 ms — h3https://poechallenges.cc/api/prices?league=Allflame&endpoint=exchange&type=Currency/api/prices?league=Allflame&endpoin... https://poechallenges.cc/api/prices?league=Allflame&endpoint=exchange&type=Currency — 200 — 5.5 KiB — 234 ms — h3https://poechallenges.cc/api/prices?league=Allflame&endpoint=exchange&type=Runegraft/api/prices?league=Allflame&endpoin... https://poechallenges.cc/api/prices?league=Allflame&endpoint=exchange&type=Runegraft — 200 — 1.9 KiB — 236 ms — h3https://poechallenges.cc/api/prices?league=Allflame&endpoint=exchange&type=Tattoo/api/prices?league=Allflame&endpoin... https://poechallenges.cc/api/prices?league=Allflame&endpoint=exchange&type=Tattoo — 200 — 2.1 KiB — 240 ms — h3https://poechallenges.cc/api/prices?league=Allflame&endpoint=exchange&type=EnshroudingCrystal/api/prices?league=Allflame&endpoin... https://poechallenges.cc/api/prices?league=Allflame&endpoint=exchange&type=EnshroudingCrystal — 200 — 1.3 KiB — 233 ms — h3https://poechallenges.cc/api/prices?league=Allflame&endpoint=exchange&type=Essence/api/prices?league=Allflame&endpoin... https://poechallenges.cc/api/prices?league=Allflame&endpoint=exchange&type=Essence — 200 — 3.7 KiB — 247 ms — h3https://poechallenges.cc/api/prices?league=Allflame&endpoint=exchange&type=Oil/api/prices?league=Allflame&endpoin... https://poechallenges.cc/api/prices?league=Allflame&endpoint=exchange&type=Oil — 200 — 1.6 KiB — 245 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