https://dragdrivesimulator.org
Performance
· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
96
GRADE
A
FIX
0
REVIEW
2
PASS
21
INFO
3
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
78
96
100
100
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
961 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
5.59 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
151 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.
2.22 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.
5.59 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
2621 PASS 2 REVIEW
CJS Execution CostAction1361ms total JS executionREVIEW
JS Execution Cost
Action1361ms total JS execution
1361ms total JS execution
Warning::
Unattributable: 374ms CPU time
Warning::
https://dragdrivesimulator.org/: 353ms CPU time
Warning::
https://dragdrivesimulator.org/_next/static/chunks...: 323ms CPU time
Info::
https://dragdrivesimulator.org/_next/static/chunks...: 234ms CPU time
Info::
https://static.cloudflareinsights.com/beacon.min.j...: 78ms CPU time
Info::
Third-party scripts: 78ms (6% of total)
Main Thread Breakdown
Script Evaluation 40% Other 32% Style & Layout 20% Script Parsing & Compilation 5%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 374ms | 52ms | 0ms | 1st |
| https://dragdrivesimulator.org/ | 353ms | 8ms | 13ms | 1st |
| https://dragdrivesimulator.org/_next/static/chunks/4c86ddcf3a767f1a.js | 323ms | 296ms | 22ms | 1st |
| https://dragdrivesimulator.org/_next/static/chunks/9054c84ba21a4c14.js | 234ms | 124ms | 16ms | 1st |
| https://static.cloudflareinsights.com/beacon.min.js/v4513226cdae34746b4dedf0b4dfa099e1781791509496 | 78ms | 65ms | 3ms | 3rd |
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::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
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 |
APage Weight Budget793 KB transferred, 46 requestsPASS
Page Weight Budget
793 KB transferred, 46 requests
793 KB transferred, 46 requests
Info::
Page weighs 1.7 MB (793 KB transferred)
Info::
46 HTTP requests
Info::
Estimated 0.16 g CO2 per page load
793 KB transferred
46 requests
0.16 g CO2 per page load
Images 430.6 KiB 54%
JavaScript 161.6 KiB 20%
Other 99.9 KiB 13%
Fonts 47.8 KiB 6%
Other 33.6 KiB 4%
HTML 10.4 KiB 1%
CSS 7.7 KiB 1%
Other 813 B 0%
Other 463 B 0%
0 2.4 MB 4.9 MB
Under budget
A+Third-Party Impact1% third-party, 0 ms blockingPASS
Third-Party Impact
1% third-party, 0 ms blocking
1% third-party, 0 ms blocking
Info::
Third-party code accounts for 1% of page weight (11.3 KiB of 792.8 KiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-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 Optimization2 images, 0 KB saveablePASS
Image Optimization
2 images, 0 KB saveable
2 images, 0 KB saveable
Info::
All images are well-optimized
2 images 431 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+Font Loading1 fonts (48 KB)PASS
Font Loading
1 fonts (48 KB)
1 fonts (48 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
1
48 KB total
Render-blocking
0
of 1
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
83afe278b6a6bb3c-s.p.3a... woff2 swap
Size 48 KB
Load time 66 ms
Start 86 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+JS Bundles12 scripts, 28 KB unusedPASS
JS Bundles
12 scripts, 28 KB unused
12 scripts, 28 KB unused
Warning::
https://dragdrivesimulator.org/_next/static/chunks...: 28 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 28 KB
28 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://dragdrivesimulator.org/_next/static/chunks/4c86ddcf3a767f1a.js | 69 KB | 28 KB (41%) | ✓ | 1st |
| https://dragdrivesimulator.org/_next/static/chunks/c8fe31dcfd3f3ef5.js | 4 KB | — | ✓ | 1st |
| https://dragdrivesimulator.org/_next/static/chunks/82abf2d65f5428ae.js | 8 KB | — | ✓ | 1st |
| https://dragdrivesimulator.org/_next/static/chunks/9054c84ba21a4c14.js | 36 KB | — | ✓ | 1st |
| https://dragdrivesimulator.org/_next/static/chunks/turbopack-a863e30129845be2.js | 5 KB | — | ✓ | 1st |
| https://dragdrivesimulator.org/_next/static/chunks/f1e68c2c50004c78.js | 15 KB | — | ✓ | 1st |
| https://dragdrivesimulator.org/_next/static/chunks/ff1a16fafef87110.js | 1 KB | — | ✓ | 1st |
| https://dragdrivesimulator.org/_next/static/chunks/d2be314c3ece3fbe.js | 8 KB | — | ✓ | 1st |
| https://static.cloudflareinsights.com/beacon.min.js/v4513226cdae34746b4dedf0b4dfa099e1781791509496 | 11 KB | — | ✓ | 3rd |
| https://dragdrivesimulator.org/_next/static/chunks/d08b867abbe8e11e.js | 3 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
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::
1 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.3a6ba036.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.3a6ba036.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-SvcPASS
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
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 AlgorithmMain response uses brotliPASS
Compression Algorithm
Main response uses brotli
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 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-Timing Observability3 Server-Timing entries advertisedPASS
Server-Timing Observability
3 Server-Timing entries advertised
3 Server-Timing entries advertised
Info::
Server-Timing header advertises 3 timing entries
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
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 Inventory46 resources · 793 KB · 28 KB savings availablePASS
Page Weight Inventory
46 resources · 793 KB · 28 KB savings available
46 resources · 793 KB · 28 KB savings available
Info::
Within 1MB page-weight target
Got: 793 KB
Info::
1 third-party resources (1% of weight)
Info::
1 resources over 200KB
46 resources · 792.8 KiB · 1 third-party Within 1MB page-weight target
Image 67% · 530.5 KiB
JavaScript 20% · 161.6 KiB
Font 6% · 47.8 KiB
Other 4% · 32.5 KiB
Document 2% · 12.8 KiB
CSS 1% · 7.7 KiB
~28.1 KiB of savings available
Remove unused JavaScript: 28.1 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 46 resources | 792.8 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
AJavaScript Blocking1 JS blocking issue(s) detectedPASS
JavaScript Blocking
1 JS blocking issue(s) detected
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 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
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall46 requests over 1601msINFO
Network Waterfall
46 requests over 1601ms
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
6% of JavaScript execution is third-party
First-party Third-party 78ms · 11KB · €1/mo
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
static.cloudflareinsights.com static.cloudflareinsights.com | Other | 78ms | 11 KB | — | €1/mo | Optional |
static.cloudflareinsights.com
Other
Execution 78ms
Transfer 11 KB
Monthly Cost €1/mo
Image Optimization2 images, 961 KB total, 427 KB wastedINFO
Image Optimization
2 images, 961 KB total, 427 KB wasted
Image Optimization Audit
Total Images
2
Total Size
961 KB
Oversized
1
Wasted
427 KB
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.