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.
809 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.20 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
31 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.010
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.45 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.
3.16 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS BundlesAction28 scripts, 563 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://id.nbcuni.com/websdk/v2/identity-sdk.min.js | 210 KB | 158 KB (76%) | ✓ | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097963 | 187 KB | 123 KB (66%) | ✓ | 3rd |
| https://micro.rubiconproject.com/prebid/dynamic/24610.js | 130 KB | 94 KB (72%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202505.2.0/otBannerSdk.js | 119 KB | 61 KB (51%) | ✓ | 3rd |
| https://c.amazon-adsystem.com/aax2/apstag.js | 91 KB | 39 KB (43%) | ✓ | 3rd |
| https://jssdkcdns.mparticle.com/js/v2/us1-58b94ff38714bc47bdab2e66cf8e063c/mparticle.js | 58 KB | 34 KB (60%) | ✓ | 3rd |
| https://app.mps.vsnt.net/fetch/ext/load-syfy-d8-web.js?nowrite=2 | 58 KB | 29 KB (50%) | ✗ | 3rd |
| https://www.syfy.com/sites/syfy/files/js/js_nDQLYdWjPTcTaTEGeObUHmwug2XAPDAJMk9OvNISVLA.js?scope=footer&delta=0&language=en&theme=syfy&include=eJyNUVtywjAMvFDBR9IotiBqhJVKcjvp6etAoUwKnX5Z2sfYu85qlIq1GWUf2vJI71TDd0EeL8KHfizSFew4CEGrolhgxFqE7E5wFB1Qdp6N5_A7YiRTMHL-XPUOWHQgwIqyBGdPmx1GPRGEYZ64Hv9jmPH4t8E5CLIWgldfeS49IccCHhjfVrL0lFk9gq3msaBNsqTNvvKnGa1f1vPepv1MmDVP4G241MJan2h_p9ZKYc0jceVYgTVFGqwX37OIml9ByGjanMQvXV_XB7x_8Ez2o3hrnCfhOqXb9AiD8xt8OSybb_4CrmrlVA | 47 KB | 25 KB (53%) | ✓ | 3rd |
| https://www.syfy.com/sites/syfy/files/js/js_mQ1C4Mr_IpDWNt-m5WEUxCwRif2Pp2hLSP41mE9PB1w.js?scope=footer&delta=4&language=en&theme=syfy&include=eJyNUVtywjAMvFDBR9IotiBqhJVKcjvp6etAoUwKnX5Z2sfYu85qlIq1GWUf2vJI71TDd0EeL8KHfizSFew4CEGrolhgxFqE7E5wFB1Qdp6N5_A7YiRTMHL-XPUOWHQgwIqyBGdPmx1GPRGEYZ64Hv9jmPH4t8E5CLIWgldfeS49IccCHhjfVrL0lFk9gq3msaBNsqTNvvKnGa1f1vPepv1MmDVP4G241MJan2h_p9ZKYc0jceVYgTVFGqwX37OIml9ByGjanMQvXV_XB7x_8Ez2o3hrnCfhOqXb9AiD8xt8OSybb_4CrmrlVA | 14 KB | — | ✓ | 3rd |
| https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement.min.js | 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 InventoryAction108 resources · 1.6 MB · 563 KB savings availableFIX
~563.1 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 108 resources | 1.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CPage Weight BudgetAction1.6 MB transferred, 108 requestsREVIEW
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
BImage Optimization35 images, 0 KB saveableREVIEW
CJS Execution CostAction1479ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 280ms | 61ms | 0ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097963 | 211ms | 171ms | 19ms | 3rd |
| https://www.syfy.com/libraries/swiper-mini/swiper-bundle.min.js?v=11.2.8 | 191ms | 20ms | 3ms | 3rd |
| https://www.syfy.com/ | 165ms | 14ms | 1ms | 3rd |
| https://id.nbcuni.com/websdk/v2/identity-sdk.min.js | 106ms | 69ms | 30ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202505.2.0/otBannerSdk.js | 102ms | 64ms | 16ms | 3rd |
| https://app.mps.vsnt.net/fetch/ext/load-syfy-d8-web.js?nowrite=2 | 72ms | 56ms | 13ms | 3rd |
| https://c.amazon-adsystem.com/aax2/apstag.js | 69ms | 52ms | 12ms | 3rd |
| https://www.syfy.com/sites/syfy/files/js/js_4rwGwTfiGRTxCXsvjukH8Iw09JxuSVPT30ihk_o4wQ4.js?scope=header&delta=0&language=en&theme=syfy&include=eJyNUVtywjAMvFDBR9IotiBqhJVKcjvp6etAoUwKnX5Z2sfYu85qlIq1GWUf2vJI71TDd0EeL8KHfizSFew4CEGrolhgxFqE7E5wFB1Qdp6N5_A7YiRTMHL-XPUOWHQgwIqyBGdPmx1GPRGEYZ64Hv9jmPH4t8E5CLIWgldfeS49IccCHhjfVrL0lFk9gq3msaBNsqTNvvKnGa1f1vPepv1MmDVP4G241MJan2h_p9ZKYc0jceVYgTVFGqwX37OIml9ByGjanMQvXV_XB7x_8Ez2o3hrnCfhOqXb9AiD8xt8OSybb_4CrmrlVA | 66ms | 60ms | 0ms | 3rd |
| https://micro.rubiconproject.com/prebid/dynamic/24610.js | 57ms | 44ms | 12ms | 3rd |
Showing top 10 of 13 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 Loading7 fonts (25 KB)PASS
Web fonts
7
25 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
- 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)
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall108 requests over 3615msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 280ms | 0 KB | — | $4/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 211ms | 187 KB | 66% | $3/mo | Costly |
www.syfy.com www.syfy.com | Other | 191ms | 25 KB | — | $3/mo | Optional |
www.syfy.com www.syfy.com | Other | 165ms | 20 KB | — | $2/mo | Optional |
id.nbcuni.com id.nbcuni.com | Other | 106ms | 210 KB | 76% | $1/mo | Optional |
OneTrust cdn.cookielaw.org | Consent | 102ms | 119 KB | 51% | $1/mo | Essential |
app.mps.vsnt.net app.mps.vsnt.net | Other | 72ms | 58 KB | 50% | $1/mo | Optional |
c.amazon-adsystem.com c.amazon-adsystem.com | Other | 69ms | 91 KB | 43% | $1/mo | Optional |
www.syfy.com www.syfy.com | Other | 66ms | 5 KB | — | $1/mo | Optional |
micro.rubiconproject.com micro.rubiconproject.com | Other | 57ms | 130 KB | 72% | $1/mo | Optional |
www.syfy.com www.syfy.com | Other | 55ms | 47 KB | 53% | $1/mo | Optional |
assets.adobedtm.com assets.adobedtm.com | Other | 54ms | 45 KB | — | $1/mo | Optional |
OneTrust cdn.cookielaw.org | Consent | 51ms | 23 KB | — | $1/mo | Essential |
These scripts may cost more than they're worth
- Unattributable adds 280ms and costs ~$4/month
- securepubads.g.doubleclick.net adds 211ms 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
Unattributable takes 280ms 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
securepubads.g.doubleclick.net takes 211ms 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
66% 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
76% of id.nbcuni.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
51% of OneTrust'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
72% of micro.rubiconproject.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
53% of www.syfy.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