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.
1.40 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.97 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
134 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.106
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.74 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.
3.34 s
Page Load Progression
FPage Weight BudgetAction3.1 MB transferred, 93 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
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
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS BundlesAction23 scripts, 450 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://store.akamai.steamstatic.com/public/javascript/applications/store/main.js?v=CYgBmprFPCW8&l=english&_cdn=akamai | 374 KB | 310 KB (83%) | ✓ | 3rd |
| https://store.akamai.steamstatic.com/public/javascript/applications/store/libraries~b28b7af69.js?v=2YtNk3cAAsTl&l=english&_cdn=akamai | 166 KB | 90 KB (54%) | ✓ | 3rd |
| https://store.akamai.steamstatic.com/public/shared/javascript/shared_global.js?v=MZ63Bj2bxVCi&l=english&_cdn=akamai | 38 KB | 30 KB (80%) | ✗ | 3rd |
| https://store.akamai.steamstatic.com/public/javascript/home.js?v=p1JLxKgLnZAL&l=english&_cdn=akamai | 36 KB | 20 KB (58%) | ✗ | 3rd |
| https://store.akamai.steamstatic.com/public/javascript/dynamicstore.js?v=Ip2--85Texdk&l=english&_cdn=akamai | 20 KB | — | ✗ | 3rd |
| https://store.akamai.steamstatic.com/public/javascript/applications/store/sales_english-json.js?contenthash=ca011045dee70bed3958 | 53 KB | — | ✓ | 3rd |
| https://store.akamai.steamstatic.com/public/javascript/main.js?v=2jl8YRZgA0FC&l=english&_cdn=akamai | 21 KB | — | ✗ | 3rd |
| https://store.akamai.steamstatic.com/public/javascript/cluster.js?v=_t673ZDyh-Af&l=english&_cdn=akamai | 4 KB | — | ✓ | 3rd |
| https://store.akamai.steamstatic.com/public/shared/javascript/shared_responsive_adapter.js?v=XZm6x5HVwOht&l=english&_cdn=akamai | 6 KB | — | ✓ | 3rd |
| https://store.akamai.steamstatic.com/public/javascript/applications/store/manifest.js?v=HE3Cjo_DoCya&l=english&_cdn=akamai | 13 KB | — | ✓ | 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
FPage Weight InventoryAction93 resources · 3.1 MB · 450 KB savings availableFIX
~450.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 93 resources | 3.1 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction49 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CJS Execution CostAction1340ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://store.steampowered.com/ | 415ms | 12ms | 24ms | 3rd |
| https://store.akamai.steamstatic.com/public/shared/javascript/jquery-1.8.3.min.js?v=NXam5zydzNu8&l=english&_cdn=akamai | 336ms | 207ms | 3ms | 3rd |
| https://store.akamai.steamstatic.com/public/javascript/applications/store/main.js?v=CYgBmprFPCW8&l=english&_cdn=akamai | 231ms | 168ms | 57ms | 3rd |
| https://store.akamai.steamstatic.com/public/javascript/applications/store/libraries~b28b7af69.js?v=2YtNk3cAAsTl&l=english&_cdn=akamai | 179ms | 122ms | 24ms | 3rd |
| Unattributable | 178ms | 3ms | 0ms | 3rd |
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 Loading7 fonts (524 KB)PASS
Web fonts
7
524 KB total
Render-blocking
0
of 7
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
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 ~275 KB and ~550 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall93 requests over 1919msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
store.steampowered.com store.steampowered.com | Other | 415ms | 126 KB | — | €5/mo | Costly |
store.akamai.steamstatic.com store.akamai.steamstatic.com | Other | 336ms | 33 KB | — | €4/mo | Costly |
store.akamai.steamstatic.com store.akamai.steamstatic.com | Other | 231ms | 374 KB | 83% | €3/mo | Costly |
store.akamai.steamstatic.com store.akamai.steamstatic.com | Other | 179ms | 166 KB | 54% | €2/mo | Optional |
Unattributable Unattributable | Other | 178ms | 0 KB | — | €2/mo | Optional |
These scripts may cost more than they're worth
- store.steampowered.com adds 415ms and costs ~€5/month
- store.akamai.steamstatic.com adds 336ms and costs ~€4/month
- store.akamai.steamstatic.com adds 231ms and costs ~€3/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
store.steampowered.com takes 415ms 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
store.akamai.steamstatic.com takes 336ms 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
store.akamai.steamstatic.com takes 231ms 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
83% of store.akamai.steamstatic.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
54% of store.akamai.steamstatic.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