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.
2.16 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
6.05 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
624 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.032
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.11 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.
7.71 s
Page Load Progression
375 ms 750 ms
1.1 s
1.5 s
1.9 s 2.2 s 2.6 s 3.0 sFPage Weight BudgetAction8.4 MB transferred, 192 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 CostAction3713ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://500px.com/staticV2/js/14.44e69f6c.chunk.js | 1773ms | 1200ms | 89ms | 1st |
| https://www.googletagmanager.com/gtm.js?id=GTM-P9G3RQC | 467ms | 445ms | 13ms | 3rd |
| https://500px.com/ | 417ms | 71ms | 1ms | 1st |
| https://500px.com/staticV2/js/main.7530e8ac.chunk.js | 310ms | 260ms | 40ms | 1st |
| Unattributable | 243ms | 32ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=G-KN4MZD3GN3&cx=c>m=4e64h1 | 122ms | 110ms | 11ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 100ms | 72ms | 21ms | 3rd |
| https://cdn4.buysellads.net/pub/500px.js?1776798000000 | 81ms | 63ms | 17ms | 3rd |
| https://c.amazon-adsystem.com/aax2/apstag.js | 78ms | 60ms | 13ms | 3rd |
| https://btloader.com/tag?o=5102648370397184&upapi=true | 66ms | 52ms | 11ms | 3rd |
Showing top 10 of 11 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 | 1038 KB | 530 KB (51%) | ✓ | 1st |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 188 KB | 141 KB (75%) | ✓ | 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 | 36 KB (64%) | ✓ | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 97 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 InventoryAction192 resources · 8.4 MB · 1.3 MB savings availableFIX
~1.3 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 192 resources | 8.4 MiB | ||||||
BThird-Party Impact50% third-party, 0 ms blockingREVIEW
BImage Optimization54 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 (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+HTTP Cachingmax-age=300 (5 minutes)PASS
max-age=300
| Directive | Value | Meaning |
|---|---|---|
| max-age | 300 | Cache for 5 minutes |
Network Waterfall192 requests over 6139msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Google Tag Manager www.googletagmanager.com | Tag Manager | 467ms | 142 KB | 38% | $6/mo | Costly |
Unattributable Unattributable | Other | 243ms | 0 KB | — | $3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 122ms | 177 KB | 33% | $2/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 100ms | 188 KB | 75% | $1/mo | Optional |
cdn4.buysellads.net cdn4.buysellads.net | Other | 81ms | 160 KB | 70% | $1/mo | Optional |
c.amazon-adsystem.com c.amazon-adsystem.com | Other | 78ms | 91 KB | 56% | $1/mo | Optional |
btloader.com btloader.com | Other | 66ms | 35 KB | — | $1/mo | Optional |
Hotjar script.hotjar.com | Session Replay | 55ms | 57 KB | 64% | $1/mo | Optional |
These scripts may cost more than they're worth
- Google Tag Manager adds 467ms and costs ~$6/month
- Unattributable adds 243ms and costs ~$3/month
Google Tag Manager takes 467ms 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 243ms 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
75% 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
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
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
64% 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