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.
19.71 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
23.19 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
175 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.001
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
19.71 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.
24.13 s
Page Load Progression
FPage Weight BudgetAction7.1 MB transferred, 97 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 ImpactAction95% third-party, 0 ms blockingFIX
FJS BundlesAction23 scripts, 505 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://store.fastly.steamstatic.com/public/javascript/applications/store/main.js?v=CYgBmprFPCW8&l=english&_cdn=fastly | 374 KB | 310 KB (83%) | ✓ | 3rd |
| https://store.fastly.steamstatic.com/public/javascript/applications/store/libraries~b28b7af69.js?v=2YtNk3cAAsTl&l=english&_cdn=fastly | 165 KB | 90 KB (54%) | ✓ | 3rd |
| https://store.fastly.steamstatic.com/public/javascript/applications/store/libraries~73ab827c1.js?contenthash=07947655aa3af5e2f319 | 51 KB | 49 KB (95%) | ✓ | 3rd |
| https://store.fastly.steamstatic.com/public/shared/javascript/shared_global.js?v=74PhtZvVZD8D&l=english&_cdn=fastly | 38 KB | 30 KB (79%) | ✗ | 3rd |
| https://store.fastly.steamstatic.com/public/javascript/applications/store/footer.js?contenthash=c02f5af2fe13c839749d | 46 KB | 27 KB (59%) | ✓ | 3rd |
| https://store.fastly.steamstatic.com/public/javascript/dynamicstore.js?v=YfwgycQUrKfu&l=english&_cdn=fastly | 20 KB | — | ✗ | 3rd |
| https://store.fastly.steamstatic.com/public/javascript/applications/store/main_english-json.js?contenthash=e074c23d1ff93816e368 | 87 KB | — | ✓ | 3rd |
| https://store.fastly.steamstatic.com/public/javascript/cluster.js?v=Xhyo8cGiiO4M&l=english&_cdn=fastly | 4 KB | — | ✓ | 3rd |
| https://store.fastly.steamstatic.com/public/shared/javascript/shared_responsive_adapter.js?v=XZm6x5HVwOht&l=english&_cdn=fastly | 6 KB | — | ✓ | 3rd |
| https://store.fastly.steamstatic.com/public/javascript/applications/store/manifest.js?v=HE3Cjo_DoCya&l=english&_cdn=fastly | 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
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 InventoryAction97 resources · 7.1 MB · 505 KB savings availableFIX
~505.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 97 resources | 7.1 MiB | ||||||
CImage OptimizationAction53 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
CJS Execution CostAction1983ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://store.steampowered.com/ | 633ms | 16ms | 35ms | 1st |
| https://store.fastly.steamstatic.com/public/shared/javascript/jquery-1.8.3.min.js?v=NXam5zydzNu8&l=english&_cdn=fastly | 513ms | 286ms | 6ms | 3rd |
| Unattributable | 301ms | 5ms | 0ms | 3rd |
| https://store.fastly.steamstatic.com/public/javascript/applications/store/main.js?v=CYgBmprFPCW8&l=english&_cdn=fastly | 272ms | 190ms | 75ms | 3rd |
| https://store.fastly.steamstatic.com/public/javascript/applications/store/libraries~b28b7af69.js?v=2YtNk3cAAsTl&l=english&_cdn=fastly | 264ms | 175ms | 28ms | 3rd |
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
BHTTP Cachingno-cacheREVIEW
no-cache
| Directive | Value | Meaning |
|---|---|---|
| no-cache | — | Cache but always revalidate first |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading7 fonts (849 KB)PASS
Web fonts
7
849 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
- 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
- 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 ~679 KB and ~1358 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall97 requests over 5525msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
store.fastly.steamstatic.com store.fastly.steamstatic.com | Other | 513ms | 33 KB | — | $7/mo | Costly |
Unattributable Unattributable | Other | 301ms | 0 KB | — | $4/mo | Costly |
store.fastly.steamstatic.com store.fastly.steamstatic.com | Other | 272ms | 374 KB | 83% | $4/mo | Costly |
store.fastly.steamstatic.com store.fastly.steamstatic.com | Other | 264ms | 165 KB | 54% | $4/mo | Costly |
These scripts may cost more than they're worth
- store.fastly.steamstatic.com adds 513ms and costs ~$7/month
- Unattributable adds 301ms and costs ~$4/month
- store.fastly.steamstatic.com adds 272ms and costs ~$4/month
- store.fastly.steamstatic.com adds 264ms and costs ~$4/month
68% of JavaScript execution time comes from third-party scripts.
Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.
Learn more ▾ ▴
Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.
Source: web.dev / HTTP Archive Web Almanac
store.fastly.steamstatic.com takes 513ms 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
Unattributable takes 301ms 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.fastly.steamstatic.com takes 272ms 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.fastly.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
store.fastly.steamstatic.com takes 264ms 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
54% of store.fastly.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