Performance
· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
5.07 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
22.64 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.85 s
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.
8.44 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.
22.64 s
Page Load Progression
FPage Weight BudgetAction3.4 MB transferred, 147 requestsFIX
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
Source: web.dev
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction99% third-party, 0 ms blockingFIX
FJS Execution CostAction3999ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://js.rbxcdn.com/f85d601076f1849ac8b25524d2c66878afe6b40ef64ff0d9c778c2811e26378b-Sentry.js | 757ms | 551ms | 27ms | 3rd |
| Unattributable | 495ms | 6ms | 0ms | 1st |
| https://js.rbxcdn.com/075aed60ba5e82679966fc08959a907333b99aa464fb73ff11e01460fabb8024-CoreUtilities.js | 456ms | 323ms | 109ms | 3rd |
| https://js.rbxcdn.com/c2842bfcd97e55a576b1e191a6db391103a029714ef58c8932cd301be2bede05-WebBlox.js | 435ms | 261ms | 170ms | 3rd |
| https://www.roblox.com/cdn-cgi/challenge-platform/scripts/jsd/main.js | 352ms | 341ms | 2ms | 1st |
| https://www.roblox.com/ | 348ms | 29ms | 6ms | 1st |
| https://js.rbxcdn.com/0496306d944faeb488779bad1af0738e.js | 189ms | 165ms | 16ms | 3rd |
| https://js.rbxcdn.com/fc00826f9e0f8fd2f6bfe2152fb652d4f73e1a12e1ad50ad234d2f60854a311c-Polyfill.js | 159ms | 127ms | 16ms | 3rd |
| https://js.rbxcdn.com/1050cb6a59208ef0b92013f9795f79f0b0923f3064fb36e1f64a1e68eebc8065-Challenge.js | 139ms | 78ms | 61ms | 3rd |
| https://js.rbxcdn.com/3bc4063d90978e122a5d55fdd0651e12df6c48badefd50214e478c84efd2ce2a-RealTime.js | 126ms | 76ms | 48ms | 3rd |
Showing top 10 of 16 scripts
FJS BundlesAction102 scripts, 1.6 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://js.rbxcdn.com/e3ee1d26df4ed304eedf103641f389dcfe507d24f0aa079d366824f187f14ffa-AngularJsUtilities.js | 602 KB | 455 KB (76%) | ✓ | 3rd |
| https://js.rbxcdn.com/c2842bfcd97e55a576b1e191a6db391103a029714ef58c8932cd301be2bede05-WebBlox.js | 501 KB | 253 KB (53%) | ✓ | 3rd |
| https://js.rbxcdn.com/075aed60ba5e82679966fc08959a907333b99aa464fb73ff11e01460fabb8024-CoreUtilities.js | 179 KB | 117 KB (66%) | ✓ | 3rd |
| https://js.rbxcdn.com/1050cb6a59208ef0b92013f9795f79f0b0923f3064fb36e1f64a1e68eebc8065-Challenge.js | 134 KB | 111 KB (83%) | ✓ | 3rd |
| https://js.rbxcdn.com/3bc4063d90978e122a5d55fdd0651e12df6c48badefd50214e478c84efd2ce2a-RealTime.js | 98 KB | 71 KB (74%) | ✓ | 3rd |
| https://js.rbxcdn.com/3756ad214dde52cb58a1300177547475.js | 87 KB | 69 KB (80%) | ✓ | 3rd |
| https://js.rbxcdn.com/932cd731257164fc9eba426e6b3c5c8d08469faafc68ceb51f979f331807631d-PresenceStatus.js | 83 KB | 67 KB (82%) | ✓ | 3rd |
| https://js.rbxcdn.com/a38d4c0c0d2b4a9be634a64b8ef355a663a50d604f887dcbbfda6bdb1b46a1e1-ReactStyleGuide.js | 111 KB | 67 KB (62%) | ✓ | 3rd |
| https://js.rbxcdn.com/17c30f0868b8f64a10d24db42ca77291f709fb48ab9abd71a32b8c23219a92c6-AccessManagementUpsellV2.js | 78 KB | 52 KB (67%) | ✓ | 3rd |
| https://js.rbxcdn.com/f03f5cfcf75630103ff9505c7e05585c1ee6bdc9096b89021c07b16ef3f09abd-ItemPurchase.js | 60 KB | 48 KB (80%) | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction147 resources · 3.4 MB · 1.6 MB savings availableFIX
~1.6 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 147 resources | 3.4 MiB | ||||||
DHTTP CachingActionno-store (uncacheable)FIX
no-store, must-revalidate, no-cache
| Directive | Value | Meaning |
|---|---|---|
| no-store | — | Never cache this response |
| must-revalidate | — | Must recheck with server after expiry |
| no-cache | — | Cache but always revalidate first |
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
BCompression AlgorithmMain response uses gzip; brotli would be ~20% smallerREVIEW
BJavaScript Blocking2 JS blocking issue(s) detectedREVIEW
A+Text CompressionAll text resources are compressedPASS
AImage Optimization5 images, 0 KB saveablePASS
A+Font Loading4 fonts (142 KB)PASS
Web fonts
4
142 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
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
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints4 hints, 0 missing preconnectsPASS
Current Resource Hints
4 resource hints configured
A+LCP Image PreloadLCP preload audit not availablePASS
A+Main HTML Cache-ControlMain HTML uses no-store -- correct for sensitive/dynamic contentPASS
A+Server-Timing Observability3 Server-Timing entries advertisedPASS
A+Server Response Intelligence2 server-response signal(s) detectedPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
ACSS Performance Depth1 CSS depth issue(s) detectedPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall147 requests over 2708msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
js.rbxcdn.com js.rbxcdn.com | Other | 757ms | 88 KB | 48% | $13/mo | Costly |
js.rbxcdn.com js.rbxcdn.com | Other | 456ms | 179 KB | 66% | $8/mo | Costly |
js.rbxcdn.com js.rbxcdn.com | Other | 435ms | 501 KB | 53% | $8/mo | Costly |
js.rbxcdn.com js.rbxcdn.com | Other | 189ms | 44 KB | — | $3/mo | Optional |
js.rbxcdn.com js.rbxcdn.com | Other | 159ms | 66 KB | 43% | $3/mo | Optional |
js.rbxcdn.com js.rbxcdn.com | Other | 139ms | 134 KB | 83% | $2/mo | Optional |
js.rbxcdn.com js.rbxcdn.com | Other | 126ms | 98 KB | 74% | $2/mo | Optional |
js.rbxcdn.com js.rbxcdn.com | Other | 122ms | 111 KB | 62% | $2/mo | Optional |
js.rbxcdn.com js.rbxcdn.com | Other | 122ms | 602 KB | 76% | $2/mo | Optional |
js.rbxcdn.com js.rbxcdn.com | Other | 93ms | 43 KB | 75% | $2/mo | Optional |
js.rbxcdn.com js.rbxcdn.com | Other | 76ms | 78 KB | 57% | $1/mo | Optional |
js.rbxcdn.com js.rbxcdn.com | Other | 66ms | 78 KB | 67% | $1/mo | Optional |
js.rbxcdn.com js.rbxcdn.com | Other | 65ms | 48 KB | 67% | $1/mo | Optional |
These scripts may cost more than they're worth
- js.rbxcdn.com adds 757ms and costs ~$13/month
- js.rbxcdn.com adds 456ms and costs ~$8/month
- js.rbxcdn.com adds 435ms and costs ~$8/month
70% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.
Learn more ▾ ▴
Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.
Source: web.dev
js.rbxcdn.com takes 757ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
js.rbxcdn.com takes 456ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
66% of js.rbxcdn.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
js.rbxcdn.com takes 435ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
53% of js.rbxcdn.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
83% of js.rbxcdn.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
74% of js.rbxcdn.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
62% of js.rbxcdn.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
76% of js.rbxcdn.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
75% of js.rbxcdn.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
57% of js.rbxcdn.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
67% of js.rbxcdn.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
67% of js.rbxcdn.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
Real-User Performance (CrUX)Field metrics from the Chrome User Experience ReportINFO
Chrome User Experience (CrUX)
Real-user metrics from the Chrome UX Report (2026-07-24 — 2026-08-20)
LCP (p75)
4215 ms
49% good
INP (p75)
94 ms
90% good
CLS (p75)
0.140
70% good
FCP (p75)
4093 ms
TTFB (p75)
908 ms
Image Optimization9 images, 0 KB total, 0 KB wastedINFO
Image Optimization Audit
Total Images
9
Total Size
0 KB
Oversized
3