Performance
· 17 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.
5.24 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
17.24 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
2.24 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.
6.37 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.
17.27 s
Page Load Progression
DPage Weight BudgetAction2.6 MB transferred, 137 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
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 ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction4555ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 693ms | 6ms | 0ms | 3rd |
| https://js.rbxcdn.com/118998e29ce4dfc712b4033370590464a3c9610c1b49367b2422627491816a80-Sentry.js | 623ms | 449ms | 28ms | 3rd |
| https://js.rbxcdn.com/63b59480fef503ff6648900d1051bae7531757a38ce24f77587552fca279d16c.js | 609ms | 382ms | 214ms | 3rd |
| https://js.rbxcdn.com/c035e21695db8d5ed0e8e0374f200db819c267ecebcc72afc36d3f2aa3b3cd9a-CoreUtilities.js | 420ms | 244ms | 171ms | 3rd |
| https://www.roblox.com/ | 366ms | 12ms | 7ms | 3rd |
| https://js.rbxcdn.com/b27075e463237535a1fea6937020064e1b530fa477e02c255420ccea4961fd17-Challenge.js | 289ms | 168ms | 106ms | 3rd |
| https://js.rbxcdn.com/5c8a2ba3737908f693394045e81ebd71c77cde6f87550ea51f7833e8c98200ae.js | 232ms | 201ms | 26ms | 3rd |
| https://js.rbxcdn.com/7186c09cc12cb47a4b6c2ee1fc627e4980305f0fb38e08f59151a1d07e622587.js | 195ms | 121ms | 74ms | 3rd |
| https://js.rbxcdn.com/a3fe79f1bfdd96b7f0ad20eab2de7a05.js | 192ms | 150ms | 18ms | 3rd |
| https://js.rbxcdn.com/5b2f2f6442447efaf65971ce280a154b5c278d234751fac0d4a3ae65deedd30c-ReactStyleGuide.js | 181ms | 127ms | 54ms | 3rd |
Showing top 10 of 19 scripts
FJS BundlesAction95 scripts, 1009 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://js.rbxcdn.com/63b59480fef503ff6648900d1051bae7531757a38ce24f77587552fca279d16c.js | 405 KB | 201 KB (52%) | ✓ | 3rd |
| https://js.rbxcdn.com/b27075e463237535a1fea6937020064e1b530fa477e02c255420ccea4961fd17-Challenge.js | 162 KB | 124 KB (77%) | ✓ | 3rd |
| https://js.rbxcdn.com/7186c09cc12cb47a4b6c2ee1fc627e4980305f0fb38e08f59151a1d07e622587.js | 141 KB | 103 KB (74%) | ✓ | 3rd |
| https://js.rbxcdn.com/c035e21695db8d5ed0e8e0374f200db819c267ecebcc72afc36d3f2aa3b3cd9a-CoreUtilities.js | 160 KB | 91 KB (71%) | ✓ | 3rd |
| https://js.rbxcdn.com/3756ad214dde52cb58a1300177547475.js | 90 KB | 71 KB (80%) | ✓ | 3rd |
| https://js.rbxcdn.com/932cd731257164fc9eba426e6b3c5c8d08469faafc68ceb51f979f331807631d-PresenceStatus.js | 81 KB | 66 KB (82%) | ✓ | 3rd |
| https://js.rbxcdn.com/5b2f2f6442447efaf65971ce280a154b5c278d234751fac0d4a3ae65deedd30c-ReactStyleGuide.js | 109 KB | 66 KB (62%) | ✓ | 3rd |
| https://js.rbxcdn.com/c27f57f4a397dabc2fe3b74fec93c2401913bdf49373f9339c00b6f18b32d2ac.js | 73 KB | 41 KB (57%) | ✓ | 3rd |
| https://js.rbxcdn.com/c52d5e9748da5d99576013a33fb222b778dd3b8e4b2450beb3a094674b372852-ItemPurchase.js | 51 KB | 40 KB (79%) | ✓ | 3rd |
| https://js.rbxcdn.com/118998e29ce4dfc712b4033370590464a3c9610c1b49367b2422627491816a80-Sentry.js | 55 KB | 32 KB (59%) | ✓ | 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 InventoryAction137 resources · 2.6 MB · 1009 KB savings availableFIX
~1008.8 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 137 resources | 2.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization7 images, 0 KB saveableREVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading3 fonts (106 KB)PASS
Web fonts
3
106 KB total
Render-blocking
0
of 3
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 HintsNo optimization neededPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall137 requests over 2406msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 693ms | 0 KB | — | $12/mo | Costly |
js.rbxcdn.com js.rbxcdn.com | Other | 623ms | 55 KB | 59% | $11/mo | Costly |
js.rbxcdn.com js.rbxcdn.com | Other | 609ms | 405 KB | 52% | $11/mo | Costly |
js.rbxcdn.com js.rbxcdn.com | Other | 420ms | 160 KB | 71% | $7/mo | Costly |
www.roblox.com www.roblox.com | Other | 366ms | 14 KB | — | $6/mo | Costly |
js.rbxcdn.com js.rbxcdn.com | Other | 289ms | 162 KB | 77% | $5/mo | Costly |
js.rbxcdn.com js.rbxcdn.com | Other | 232ms | 68 KB | 43% | $4/mo | Costly |
js.rbxcdn.com js.rbxcdn.com | Other | 195ms | 141 KB | 74% | $3/mo | Optional |
js.rbxcdn.com js.rbxcdn.com | Other | 192ms | 43 KB | — | $3/mo | Optional |
js.rbxcdn.com js.rbxcdn.com | Other | 181ms | 109 KB | 62% | $3/mo | Optional |
js.rbxcdn.com js.rbxcdn.com | Other | 121ms | 73 KB | 57% | $2/mo | Optional |
js.rbxcdn.com js.rbxcdn.com | Other | 117ms | 43 KB | 75% | $2/mo | Optional |
css.rbxcdn.com css.rbxcdn.com | Other | 106ms | 94 KB | — | $2/mo | Optional |
js.rbxcdn.com js.rbxcdn.com | Other | 98ms | 31 KB | — | $2/mo | Optional |
js.rbxcdn.com js.rbxcdn.com | Other | 92ms | 47 KB | 67% | $2/mo | Optional |
js.rbxcdn.com js.rbxcdn.com | Other | 66ms | 48 KB | 65% | $1/mo | Optional |
js.rbxcdn.com js.rbxcdn.com | Other | 52ms | 51 KB | 79% | $1/mo | Optional |
js.rbxcdn.com js.rbxcdn.com | Other | 51ms | 90 KB | 80% | $1/mo | Optional |
js.rbxcdn.com js.rbxcdn.com | Other | 50ms | 81 KB | 82% | $1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 693ms and costs ~$12/month
- js.rbxcdn.com adds 623ms and costs ~$11/month
- js.rbxcdn.com adds 609ms and costs ~$11/month
- js.rbxcdn.com adds 420ms and costs ~$7/month
- www.roblox.com adds 366ms and costs ~$6/month
- js.rbxcdn.com adds 289ms and costs ~$5/month
- js.rbxcdn.com adds 232ms and costs ~$4/month
100% 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
Unattributable takes 693ms 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 623ms 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
59% 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 609ms 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
52% 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 420ms 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
71% 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
www.roblox.com takes 366ms 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 289ms 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
77% 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 232ms 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
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
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
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
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
65% 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
79% 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
80% 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
82% 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