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.
10.99 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
27.95 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
2.66 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.102
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
11.12 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.
38.00 s
Page Load Progression
FPage Weight BudgetAction8.4 MB transferred, 175 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
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 Execution CostAction9997ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://500px.com/staticV2/js/14.44e69f6c.chunk.js | 3901ms | 2478ms | 339ms | 1st |
| https://500px.com/staticV2/js/main.7530e8ac.chunk.js | 1280ms | 1084ms | 161ms | 1st |
| Unattributable | 988ms | 140ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-P9G3RQC | 982ms | 905ms | 54ms | 3rd |
| https://500px.com/ | 547ms | 153ms | 5ms | 1st |
| https://www.googletagmanager.com/gtag/destination?id=G-KN4MZD3GN3&cx=c>m=4e64h1 | 496ms | 442ms | 49ms | 3rd |
| https://cdn4.buysellads.net/pub/500px.js?1776798000000 | 274ms | 202ms | 70ms | 3rd |
| https://btloader.com/tag?o=5102648370397184&upapi=true | 251ms | 237ms | 9ms | 3rd |
| https://c.amazon-adsystem.com/aax2/apstag.js | 210ms | 141ms | 26ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097963 | 191ms | 140ms | 47ms | 3rd |
Showing top 10 of 18 scripts
FJS BundlesAction26 scripts, 1.3 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://500px.com/staticV2/js/14.44e69f6c.chunk.js | 1039 KB | 531 KB (51%) | ✓ | 1st |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097963 | 187 KB | 142 KB (76%) | ✓ | 3rd |
| https://500px.com/staticV2/js/main.7530e8ac.chunk.js | 437 KB | 133 KB (30%) | ✓ | 1st |
| https://www.googletagmanager.com/gtag/js?id=G-KN4MZD3GN3&cx=c>m=4e64h1 | 177 KB | 113 KB (64%) | ✓ | 3rd |
| https://cdn4.buysellads.net/pub/500px.js?1776798000000 | 160 KB | 112 KB (70%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=G-KN4MZD3GN3&cx=c>m=4e64h1 | 177 KB | 58 KB (33%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-P9G3RQC | 142 KB | 54 KB (38%) | ✓ | 3rd |
| https://c.amazon-adsystem.com/aax2/apstag.js | 91 KB | 50 KB (56%) | ✓ | 3rd |
| https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js | 57 KB | 38 KB (67%) | ✓ | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 99 KB | 35 KB (36%) | ✓ | 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 InventoryAction175 resources · 8.4 MB · 1.3 MB savings availableFIX
~1.3 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 175 resources | 8.4 MiB | ||||||
BThird-Party Impact58% third-party, 0 ms blockingREVIEW
CImage OptimizationAction36 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
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 (63 KB)PASS
Web fonts
3
63 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
A+HTTP Cachingmax-age=300 (5 minutes)PASS
max-age=300
| Directive | Value | Meaning |
|---|---|---|
| max-age | 300 | Cache for 5 minutes |
Network Waterfall175 requests over 6141msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 988ms | 0 KB | — | $13/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 982ms | 142 KB | 38% | $13/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 496ms | 177 KB | 33% | $7/mo | Costly |
cdn4.buysellads.net cdn4.buysellads.net | Other | 274ms | 160 KB | 70% | $4/mo | Costly |
btloader.com btloader.com | Other | 251ms | 34 KB | — | $3/mo | Costly |
c.amazon-adsystem.com c.amazon-adsystem.com | Other | 210ms | 91 KB | 56% | $3/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 191ms | 187 KB | 76% | $3/mo | Optional |
Hotjar script.hotjar.com | Session Replay | 159ms | 57 KB | 67% | $2/mo | Optional |
s.pinimg.com s.pinimg.com | Other | 152ms | 27 KB | — | $2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 146ms | 99 KB | 36% | $2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 131ms | 46 KB | — | $2/mo | Optional |
cdn.id5-sync.com cdn.id5-sync.com | Other | 78ms | 35 KB | — | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 77ms | 177 KB | 64% | $1/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 70ms | 34 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 988ms and costs ~$13/month
- Google Tag Manager adds 982ms and costs ~$13/month
- Google Tag Manager adds 496ms and costs ~$7/month
- cdn4.buysellads.net adds 274ms and costs ~$4/month
- btloader.com adds 251ms and costs ~$3/month
- c.amazon-adsystem.com adds 210ms and costs ~$3/month
42% 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
Unattributable takes 988ms 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
Google Tag Manager takes 982ms 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
Google Tag Manager takes 496ms 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
cdn4.buysellads.net takes 274ms 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
70% of cdn4.buysellads.net'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
btloader.com takes 251ms 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
c.amazon-adsystem.com takes 210ms 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
56% of c.amazon-adsystem.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 securepubads.g.doubleclick.net'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 Hotjar'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
64% of Google Tag Manager'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