https://overheadgame.com
Performance
· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
90
GRADE
A
FIX
1
REVIEW
7
PASS
15
INFO
3
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
81
95
100
100
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
970 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.27 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
628 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.
3.65 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.
2.83 s
Page Load Progression
573 ms 1.1 s 1.7 s
2.3 s
2.9 s
3.4 s 4.0 s
4.6 sChecks
2615 PASS 7 REVIEW 1 FIX
FJS Execution CostAction3624ms total JS executionFIX
JS Execution Cost
Action3624ms total JS execution
3624ms total JS execution
Warning::
https://overheadgame.com/_next/static/chunks/0ckmw...: 2627ms CPU time
Warning::
https://overheadgame.com/_next/static/chunks/05rgw...: 611ms CPU time
Warning::
Unattributable: 274ms CPU time
Info::
https://overheadgame.com/: 112ms CPU time
Info::
Third-party scripts: 274ms (8% of total)
Main Thread Breakdown
Other 73% Script Evaluation 21%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://overheadgame.com/_next/static/chunks/0ckmwdinhsmkh.js | 2627ms | 154ms | 4ms | 1st |
| https://overheadgame.com/_next/static/chunks/05rgwsld0z.fz.js | 611ms | 561ms | 38ms | 1st |
| Unattributable | 274ms | 11ms | 0ms | 3rd |
| https://overheadgame.com/ | 112ms | 10ms | 9ms | 1st |
BJS Bundles8 scripts, 51 KB unusedREVIEW
JS Bundles
8 scripts, 51 KB unused
8 scripts, 51 KB unused
Warning::
https://overheadgame.com/_next/static/chunks/05rgw...: 29 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://overheadgame.com/_next/static/chunks/16nwd...: 22 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 51 KB
51 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://overheadgame.com/_next/static/chunks/05rgwsld0z.fz.js | 71 KB | 29 KB (41%) | ✓ | 1st |
| https://overheadgame.com/_next/static/chunks/16nwd95-vqx.2.js | 39 KB | 22 KB (58%) | ✓ | 1st |
| https://overheadgame.com/_next/static/chunks/171hxc0u17_8b.js | 8 KB | — | ✓ | 1st |
| https://overheadgame.com/_next/static/chunks/14qv0zyfqj203.js | 11 KB | — | ✓ | 1st |
| https://overheadgame.com/_next/static/chunks/turbopack-0hzwfrdrein8z.js | 5 KB | — | ✓ | 1st |
| https://overheadgame.com/_next/static/chunks/031ki__yyhwdn.js | 2 KB | — | ✓ | 1st |
| https://overheadgame.com/_next/static/chunks/15s4cd8bhy3a2.js | 13 KB | — | ✓ | 1st |
| https://overheadgame.com/_next/static/chunks/0ckmwdinhsmkh.js | 8 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
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.
CCompression AlgorithmActionMain response served uncompressedREVIEW
Compression Algorithm
ActionMain response served uncompressed
Main 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.
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.
BJavaScript Blocking2 JS blocking issue(s) detectedREVIEW
JavaScript Blocking
2 JS blocking issue(s) detected
2 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.
Warning::
Total JS execution time is 3.6 s -- over the 3.5s budget
Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.
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
BHTTP Cachingpublic, max-age=0, must-revalidateREVIEW
HTTP Caching
public, max-age=0, must-revalidate
public, max-age=0, must-revalidate
Info::
Cache-Control header is set
Got: public, max-age=0, must-revalidate
Info::
ETag present — enables conditional (304) responses
Cache-Control
public, max-age=0, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 0 | Cache for 0 seconds |
| must-revalidate | — | Must recheck with server after expiry |
A+Page Weight Budget227 KB transferred, 14 requestsPASS
Page Weight Budget
227 KB transferred, 14 requests
227 KB transferred, 14 requests
Info::
Page weighs 617 KB (227 KB transferred)
Info::
14 HTTP requests
Info::
Estimated 0.05 g CO2 per page load
227 KB transferred
14 requests
0.05 g CO2 per page load
JavaScript 156.2 KiB 69%
Fonts 58.8 KiB 26%
HTML 6.0 KiB 3%
CSS 3.8 KiB 2%
Images 1.6 KiB 1%
Other 404 B 0%
0 2.4 MB 4.9 MB
Under budget
A+Third-Party ImpactNo third-party resourcesPASS
Third-Party Impact
No third-party resources
No third-party resources
Info::
No third-party resources detected
No third-party resources detected — all resources are first-party.
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+Image Optimization1 images, 0 KB saveablePASS
Image Optimization
1 images, 0 KB saveable
1 images, 0 KB saveable
Info::
All images are well-optimized
1 images 2 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+Font Loading2 fonts (59 KB)PASS
Font Loading
2 fonts (59 KB)
2 fonts (59 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
2
59 KB total
Render-blocking
0
of 2
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
797e433ab948586e-s.p.0.... woff2 swap
Size 31 KB
Load time 175 ms
Start 77 ms
Risk FOUT — text flashes from fallback to web font
caa3a2e1cccd8315-s.p.16... woff2 swap
Size 28 KB
Load time 145 ms
Start 78 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 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
AResource Hints3 hints, 0 missing preconnectsPASS
Resource Hints
3 hints, 0 missing preconnects
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/797e433ab948586e-s.p.0.q-h669a_dqa.woff2, /_next/static/media/caa3a2e1cccd8315-s.p.16t1db8_9y2o~.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/797e433ab948586e-s.p.0.q-h669a_dqa.woff2, /_next/static/media/caa3a2e1cccd8315-s.p.16t1db8_9y2o~.woff2. Add `crossorigin` (or `crossorigin="anonymous"`) to each preload.
Why this matters
Performance issues directly impact user engagement and conversion rates.
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 max-age=0 (≤ 5min) is appropriatePASS
Main HTML Cache-Control
Main HTML max-age=0 (≤ 5min) is appropriate
Main HTML max-age=0 (≤ 5min) is appropriate
Info::
Main HTML max-age=0 (≤ 5min) is appropriate
Got: public, max-age=0, 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: 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::
`ETag` present -- conditional GET supported
A+Page Weight Inventory14 resources · 227 KB · 51 KB savings availablePASS
Page Weight Inventory
14 resources · 227 KB · 51 KB savings available
14 resources · 227 KB · 51 KB savings available
Info::
Within 1MB page-weight target
Got: 227 KB
Info::
~51 KB of savings available
14 resources · 226.7 KiB · 0 third-party Within 1MB page-weight target
JavaScript 69% · 156.2 KiB
Font 26% · 58.8 KiB
Document 3% · 6.0 KiB
CSS 2% · 3.8 KiB
Image 1% · 2.0 KiB
~51.4 KiB of savings available
Remove unused JavaScript: 51.4 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 14 resources | 226.7 KiB | ||||||
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
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 Waterfall14 requests over 882msINFO
Network Waterfall
14 requests over 882ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
8% of JavaScript execution is third-party
First-party Third-party 274ms · 0KB · €3/mo
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 274ms | 0 KB | — | €3/mo | Costly |
Unattributable
Other
Execution 274ms
Transfer 0 KB
Monthly Cost €3/mo
These scripts may cost more than they're worth
- Unattributable adds 274ms and costs ~€3/month
Unattributable takes 274ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
Why this matters
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Image Optimization1 images, 1 KB total, 0 KB wastedINFO
Image Optimization
1 images, 1 KB total, 0 KB wasted
Image Optimization Audit
Total Images
1
Total Size
1 KB
1 missing alt text 1 missing dimensions
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.