Performance
· 15 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.
537 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.63 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
20 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.
537 ms
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
2.71 s
Page Load Progression
FPage Weight BudgetAction6.4 MB transferred, 150 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
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
FJS BundlesAction70 scripts, 681 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://supercell.com/_next/static/chunks/main-af617b05f1660d1b.js | 322 KB | 183 KB (57%) | ✓ | 1st |
| https://supercell.com/_next/static/chunks/805-82b11073755d6082.js | 24 KB | 58 KB (65%) | ✓ | 1st |
| https://supercell.com/_next/static/chunks/805-82b11073755d6082.js | 0 KB | 58 KB (65%) | ✓ | 1st |
| https://supercell.com/_next/static/chunks/9647-14ec58b581def33a.js | 0 KB | 39 KB (90%) | ✓ | 1st |
| https://supercell.com/_next/static/chunks/9647-14ec58b581def33a.js | 13 KB | 39 KB (90%) | ✓ | 1st |
| https://supercell.com/_next/static/chunks/4413-c25b5ff224c20d00.js | 0 KB | 38 KB (67%) | ✓ | 1st |
| https://supercell.com/_next/static/chunks/4413-c25b5ff224c20d00.js | 14 KB | 38 KB (67%) | ✓ | 1st |
| https://supercell.com/_next/static/chunks/pages/en/careers/why-you-might-love-it-here-ebacf075a9f3800c.js | 14 KB | 28 KB (64%) | ✓ | 1st |
| https://supercell.com/_next/static/chunks/pages/en/careers/why-you-might-love-it-here-ebacf075a9f3800c.js | 0 KB | 28 KB (64%) | ✓ | 1st |
| https://supercell.com/_next/static/chunks/pages/en/careers-aa1f78548106cc96.js | 0 KB | 23 KB (73%) | ✓ | 1st |
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
DPage Weight InventoryAction150 resources · 6.4 MB · 681 KB savings availableFIX
~681.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 150 resources | 6.4 MiB | ||||||
BImage Optimization37 images, 0 KB saveableREVIEW
BJS Execution Cost541ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 175ms | 17ms | 0ms | 3rd |
| https://supercell.com/_next/static/chunks/main-af617b05f1660d1b.js | 125ms | 90ms | 30ms | 1st |
| https://supercell.com/ | 121ms | 2ms | 0ms | 1st |
| https://supercell.com/_next/static/chunks/framework-6c92b031f8ed2d7b.js | 121ms | 112ms | 3ms | 1st |
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Third-Party Impact0% third-party, 0 ms blockingPASS
A+Text CompressionAll text resources are compressedPASS
A+Font Loading4 fonts (506 KB)PASS
Web fonts
4
506 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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)
Fixing the unchecked items could save ~244 KB and ~488 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+HTTP Cachingmax-age=60 (1 minute)PASS
public,max-age=60
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 60 | Cache for 1 minute |
Network Waterfall150 requests over 795msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 175ms | 0 KB | — | €2/mo | Optional |