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.
1.22 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.05 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
67 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.011
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.57 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.
3.55 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 BudgetAction3.5 MB transferred, 135 requestsFIX
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
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS BundlesAction41 scripts, 1.0 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://cdn.adsninja.ca/adsninja_client.js?v=3644 | 318 KB | 274 KB (86%) | ✓ | 3rd |
| https://cdn.adsninja.ca/biddertypelibrary/live/Polygon/default52.js?v=3644 | 197 KB | 161 KB (82%) | ✓ | 3rd |
| https://cdn.jsdelivr.net/npm/hls.js@latest | 160 KB | 145 KB (91%) | ✓ | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097963 | 187 KB | 132 KB (70%) | ✓ | 3rd |
| https://imasdk.googleapis.com/js/sdkloader/ima3.js | 147 KB | 107 KB (73%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-3RRF1V8L1B | 151 KB | 60 KB (40%) | ✓ | 3rd |
| https://c.amazon-adsystem.com/aax2/apstag.js | 91 KB | 58 KB (64%) | ✓ | 3rd |
| https://static0.polygonimages.com/assets/valnet-footer.e60fc3b9.js | 66 KB | 51 KB (77%) | ✓ | 3rd |
| https://d15kdpgjg3unno.cloudfront.net/oPS.js?cid=76 | 60 KB | 25 KB (42%) | ✓ | 3rd |
| https://cdn.privacy-mgmt.com/unified/4.40.1/usnat.f12613136193900e32e2.bundle.js | 42 KB | 21 KB (51%) | ✓ | 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 InventoryAction135 resources · 3.5 MB · 1.0 MB savings availableFIX
~1.0 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 135 resources | 3.5 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization36 images, 0 KB saveableREVIEW
CJS Execution CostAction1504ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.polygon.com/ | 377ms | 28ms | 3ms | 3rd |
| https://d15kdpgjg3unno.cloudfront.net/oPS.js?cid=76 | 267ms | 256ms | 3ms | 3rd |
| https://static0.polygonimages.com/assets/valnet-footer.e60fc3b9.js | 184ms | 58ms | 6ms | 3rd |
| Unattributable | 180ms | 9ms | 0ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097963 | 84ms | 58ms | 12ms | 3rd |
| https://btloader.com/tag?o=5100917733457920&upapi=true | 76ms | 70ms | 2ms | 3rd |
| https://tagan.adlightning.com/valnet/bl-0d6ee0c-3d2a2185.js | 74ms | 68ms | 5ms | 3rd |
| https://cdn.sentinelpro.com/valnet/sp.js | 68ms | 57ms | 1ms | 3rd |
| https://tagan.adlightning.com/valnet/op.js | 67ms | 58ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-3RRF1V8L1B | 67ms | 55ms | 11ms | 3rd |
Showing top 10 of 11 scripts
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 Loading5 fonts (331 KB)PASS
Web fonts
5
331 KB total
Render-blocking
0
of 5
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
- Convert to woff2 for ~30% smaller file size
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 ~120 KB and ~240 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall135 requests over 5003msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.polygon.com www.polygon.com | Other | 377ms | 83 KB | — | €4/mo | Costly |
d15kdpgjg3unno.cloudfront.net d15kdpgjg3unno.cloudfront.net | Other | 267ms | 60 KB | 42% | €3/mo | Costly |
static0.polygonimages.com static0.polygonimages.com | Other | 184ms | 66 KB | 77% | €2/mo | Optional |
Unattributable Unattributable | Other | 180ms | 0 KB | — | €2/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 84ms | 187 KB | 70% | €1/mo | Optional |
btloader.com btloader.com | Other | 76ms | 31 KB | — | €1/mo | Optional |
tagan.adlightning.com tagan.adlightning.com | Other | 74ms | 89 KB | — | €1/mo | Optional |
cdn.sentinelpro.com cdn.sentinelpro.com | Other | 68ms | 6 KB | — | €1/mo | Optional |
tagan.adlightning.com tagan.adlightning.com | Other | 67ms | 10 KB | — | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 67ms | 151 KB | 40% | €1/mo | Optional |
cdn.adsninja.ca cdn.adsninja.ca | Other | 60ms | 14 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.polygon.com adds 377ms and costs ~€4/month
- d15kdpgjg3unno.cloudfront.net adds 267ms 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
www.polygon.com takes 377ms 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
d15kdpgjg3unno.cloudfront.net takes 267ms 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
77% of static0.polygonimages.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
70% 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