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.
4.99 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
15.85 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.54 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.062
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
8.17 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.
15.98 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction5803ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 855ms | 229ms | 0ms | 3rd |
| https://www.syfy.com/libraries/swiper-mini/swiper-bundle.min.js?v=11.2.8 | 816ms | 116ms | 13ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 640ms | 542ms | 77ms | 3rd |
| https://www.syfy.com/ | 608ms | 30ms | 2ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202505.2.0/otBannerSdk.js | 402ms | 249ms | 62ms | 3rd |
| https://id.nbcuni.com/websdk/v2/identity-sdk.min.js | 378ms | 218ms | 100ms | 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 | 267ms | 240ms | 2ms | 3rd |
| https://c.amazon-adsystem.com/aax2/apstag.js | 249ms | 187ms | 43ms | 3rd |
| https://app.mps.vsnt.net/fetch/ext/load-syfy-d8-web.js?nowrite=2 | 236ms | 159ms | 50ms | 3rd |
| https://micro.rubiconproject.com/prebid/dynamic/24610.js | 209ms | 161ms | 47ms | 3rd |
Showing top 10 of 20 scripts
FJS BundlesAction28 scripts, 565 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/m202604160201/pubads_impl.js | 188 KB | 125 KB (67%) | ✓ | 3rd |
| https://micro.rubiconproject.com/prebid/dynamic/24610.js | 130 KB | 95 KB (73%) | ✓ | 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 | 32 KB (56%) | ✓ | 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 | 26 KB (56%) | ✓ | 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://securepubads.g.doubleclick.net/tag/js/gpt.js | 34 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 InventoryAction105 resources · 1.7 MB · 565 KB savings availableFIX
~565.1 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 105 resources | 1.7 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CPage Weight BudgetAction1.7 MB transferred, 105 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 Optimization33 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 Loading6 fonts (23 KB)PASS
Web fonts
6
23 KB total
Render-blocking
0
of 6
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 Hints16 hints, 0 missing preconnectsPASS
Current Resource Hints
16 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall105 requests over 3558msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 855ms | 0 KB | — | $11/mo | Costly |
www.syfy.com www.syfy.com | Other | 816ms | 25 KB | — | $11/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 640ms | 188 KB | 67% | $8/mo | Costly |
www.syfy.com www.syfy.com | Other | 608ms | 20 KB | — | $8/mo | Costly |
OneTrust cdn.cookielaw.org | Consent | 402ms | 119 KB | 51% | $5/mo | Essential |
id.nbcuni.com id.nbcuni.com | Other | 378ms | 210 KB | 76% | $5/mo | Costly |
www.syfy.com www.syfy.com | Other | 267ms | 5 KB | — | $4/mo | Costly |
c.amazon-adsystem.com c.amazon-adsystem.com | Other | 249ms | 91 KB | 43% | $3/mo | Costly |
app.mps.vsnt.net app.mps.vsnt.net | Other | 236ms | 58 KB | 50% | $3/mo | Costly |
micro.rubiconproject.com micro.rubiconproject.com | Other | 209ms | 130 KB | 73% | $3/mo | Costly |
OneTrust cdn.cookielaw.org | Consent | 173ms | 23 KB | — | $2/mo | Essential |
cdn.parsely.com cdn.parsely.com | Other | 165ms | 29 KB | — | $2/mo | Optional |
assets.adobedtm.com assets.adobedtm.com | Other | 162ms | 45 KB | — | $2/mo | Optional |
www.syfy.com www.syfy.com | Other | 129ms | 47 KB | 56% | $2/mo | Optional |
pub.doubleverify.com pub.doubleverify.com | Other | 115ms | 34 KB | — | $2/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 89ms | 34 KB | — | $1/mo | Optional |
jssdkcdns.mparticle.com jssdkcdns.mparticle.com | Other | 85ms | 58 KB | 56% | $1/mo | Optional |
OneTrust cdn.cookielaw.org | Consent | 81ms | 8 KB | — | $1/mo | Essential |
assets.adobedtm.com assets.adobedtm.com | Other | 80ms | 13 KB | — | $1/mo | Optional |
config.aps.amazon-adsystem.com config.aps.amazon-adsystem.com | Other | 62ms | 1 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 855ms and costs ~$11/month
- www.syfy.com adds 816ms and costs ~$11/month
- securepubads.g.doubleclick.net adds 640ms and costs ~$8/month
- www.syfy.com adds 608ms and costs ~$8/month
- id.nbcuni.com adds 378ms and costs ~$5/month
- www.syfy.com adds 267ms and costs ~$4/month
- c.amazon-adsystem.com adds 249ms and costs ~$3/month
- app.mps.vsnt.net adds 236ms and costs ~$3/month
- micro.rubiconproject.com adds 209ms 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 855ms 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
www.syfy.com takes 816ms 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 640ms 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
67% 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
www.syfy.com takes 608ms 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
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
id.nbcuni.com takes 378ms 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
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
www.syfy.com 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
c.amazon-adsystem.com takes 249ms 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
app.mps.vsnt.net takes 236ms 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
micro.rubiconproject.com takes 209ms 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
73% 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
56% 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
56% of jssdkcdns.mparticle.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