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Performance

· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
89
GRADE
B
FIX
2
REVIEW
7
PASS
10
INFO
3

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
81
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
91
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.92 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

1.92 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.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

1.92 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.

2.73 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 s
Checks
22
10 PASS 7 REVIEW 2 FIX
D
Third-Party Impact
Action
66% third-party, 0 ms blocking
FIX
66% third-party, 0 ms blocking
Warning::
Third-party code accounts for 66% of page weight (294.0 KiB of 444.3 KiB)
Info::
Third-party blocking time is low (0 ms)
34%
66%
First-party Third-party
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
JS Execution Cost
Action
1129ms total JS execution
REVIEW
1129ms total JS execution
Warning::
https://www.sportsandbits.org/: 910ms CPU time
Info::
Unattributable: 94ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-1Q5F...: 66ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=UA-123...: 58ms CPU time
Info::
Third-party scripts: 125ms (11% of total)

Main Thread Breakdown

Style & Layout 55% Other 18% Script Evaluation 14% Parse HTML & CSS 10%
ScriptTotalScriptingParse/CompileParty
https://www.sportsandbits.org/910ms44ms2ms1st
Unattributable94ms21ms0ms1st
https://www.googletagmanager.com/gtag/js?id=G-1Q5FC7FR9C&cx=c&gtm=4e6as166ms51ms14ms3rd
https://www.googletagmanager.com/gtag/js?id=UA-123669664-158ms32ms8ms3rd
B
JS Bundles
5 scripts, 143 KB unused
REVIEW
5 scripts, 143 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-1Q5F...: 72 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-123...: 71 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 143 KB
143 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-1Q5FC7FR9C&cx=c&gtm=4e6as1160 KB72 KB (45%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-123669664-1133 KB71 KB (53%)✓3rd
https://www.sportsandbits.org/wp-content/themes/generatepress/assets/js/menu.min.js?ver=3.6.12 KB—✓1st
blob:https://www.sportsandbits.org/5abada88-da09-4ae0-ae93-d8e148daadd9-0 KB—✓3rd
https://www.sportsandbits.org/wp-includes/js/wp-emoji-release.min.js?ver=7.1.46 KB—✓1st

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
B
Document Compression
Document response uses gzip; brotli would be ~20% smaller
REVIEW
Document response uses gzip; brotli would be ~20% smaller
Info::
Main HTML response uses gzip (brotli would be ~20% smaller)
All current browsers support brotli. Most CDNs (Cloudflare, Fastly, AWS CloudFront, Vercel, Netlify) can switch from gzip to brotli with a single config flag. Origin servers (nginx, Apache) need a brotli module compiled in -- nginx-brotli or Apache mod_brotli.
B
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
No Cache-Control header on main HTML response
Info::
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
444 KB transferred, 10 requests
PASS
444 KB transferred, 10 requests
Info::
Page weighs 2.0 MB (444 KB transferred)
Info::
10 HTTP requests
Info::
Estimated 0.09 g CO2 per page load
444 KB / 2.4 MB budget
444 KB transferred
10 requests
0.09 g CO2 per page load
JavaScript 301.2 KiB 68%
HTML 133.9 KiB 30%
CSS 4.9 KiB 1%
Other 3.8 KiB 1%
Other 552 B 0%
0 2.4 MB 4.9 MB
Under budget
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Image Optimization
No images on this page
PASS
No images on this page
Info::
No images on this page
0 images 0 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: Accept-Encoding
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
A
Page Weight Inventory
10 resources · 444 KB · 143 KB savings available
PASS
10 resources · 444 KB · 143 KB savings available
Info::
Within 1MB page-weight target
Got: 444 KB
Info::
~143 KB of savings available
Warning::
4 third-party resources (66% of weight)
10 resources · 444.3 KiB · 4 third-party Within 1MB page-weight target
JavaScript 68% · 301.2 KiB
Document 30% · 134.3 KiB
CSS 1% · 4.9 KiB
Image 1% · 3.4 KiB
Other 0% · 552 B

~142.5 KiB of savings available

Remove unused JavaScript: 142.5 KiB
Asset Compression
No text asset hosts to measure
INFO
No text asset hosts to measure
Info::
No third-party or subdomain host served enough text assets to measure
Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.
Network Waterfall
10 requests over 3146ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.9 s LCP 1.9 shttps://www.sportsandbits.org// https://www.sportsandbits.org/ — 200 — 133.9 KiB — 1.8 s — http/1.1https://www.sportsandbits.org/wp-content/themes/generatepress/assets/css/main.min.css?ver=3.6.1/wp-content/themes/generatepress/as... https://www.sportsandbits.org/wp-content/themes/generatepress/assets/css/main.min.css?ver=3.6.1 — 200 — 4.9 KiB — 252 ms — http/1.1https://www.googletagmanager.com/gtag/js?id=UA-123669664-1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-123669664-1 — 200 — 133.2 KiB — 267 ms — h2https://www.googletagmanager.com/gtag/js?id=G-1Q5FC7FR9C&cx=c&gtm=4e6as1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-1Q5FC7FR9C&cx=c&gtm=4e6as1 — 200 — 160.2 KiB — 146 ms — h2https://www.sportsandbits.org/wp-content/themes/generatepress/assets/js/menu.min.js?ver=3.6.1/wp-content/themes/generatepress/as... https://www.sportsandbits.org/wp-content/themes/generatepress/assets/js/menu.min.js?ver=3.6.1 — 200 — 2.1 KiB — 252 ms — http/1.1https://region1.google-analytics.com/g/collect?v=2&tid=G-1Q5FC7FR9C&gtm=45je6as1v9108623157za20oxf1&_p=1793557409401&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=AAAI&cid=1700851657.1793557411&frm=0&ngs=1&pscdl=noapi&rcb=10&sr=800x600&uaa=x86&uab=64&uafvl=Not%253AA-Brand%3B8.0.0.0%7CChromium%3B156.0.8078.73&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=115938466~115938469~118897920~118897930~120213116~120385423~120420415~120469145~120469153~121246026~121246034~123691370&sid=1793557410&sct=1&seg=0&dl=https%3A%2F%2Fwww.sportsandbits.org%2F&dt=Sports%20and%20Bits%20%E2%80%93%20Sitio%20dedicado%20a%20los%20Deportes%2C%20la%20Tecnolog%C3%ADa%2C%20el%20Audio%20HiFi%20y%20la%20Fotograf%C3%ADa&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=2433region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-1Q5FC7FR9C&gtm=45je6as1v9108623157za20oxf1&_p=1793557409401&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=AAAI&cid=1700851657.1793557411&frm=0&ngs=1&pscdl=noapi&rcb=10&sr=800x600&uaa=x86&uab=64&uafvl=Not%253AA-Brand%3B8.0.0.0%7CChromium%3B156.0.8078.73&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=115938466~115938469~118897920~118897930~120213116~120385423~120420415~120469145~120469153~121246026~121246034~123691370&sid=1793557410&sct=1&seg=0&dl=https%3A%2F%2Fwww.sportsandbits.org%2F&dt=Sports%20and%20Bits%20%E2%80%93%20Sitio%20dedicado%20a%20los%20Deportes%2C%20la%20Tecnolog%C3%ADa%2C%20el%20Audio%20HiFi%20y%20la%20Fotograf%C3%ADa&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=2433 — 204 — 552 B — 76 ms — h2blob:https://www.sportsandbits.org/5abada88-da09-4ae0-ae93-d8e148daadd9www.sportsandbits.org/5abada88-da09... blob:https://www.sportsandbits.org/5abada88-da09-4ae0-ae93-d8e148daadd9 — 200 — -1 B — 66 ms — blobhttps://www.sportsandbits.org/favicon.ico/favicon.ico https://www.sportsandbits.org/favicon.ico — 302 — 416 B — 276 ms — http/1.1https://www.sportsandbits.org/wp-includes/js/wp-emoji-release.min.js?ver=7.1.4/wp-includes/js/wp-emoji-release.mi... https://www.sportsandbits.org/wp-includes/js/wp-emoji-release.min.js?ver=7.1.4 — 200 — 5.6 KiB — 247 ms — http/1.1https://www.sportsandbits.org/wp-includes/images/w-logo-gray-white-bg.png/wp-includes/images/w-logo-gray-whi... https://www.sportsandbits.org/wp-includes/images/w-logo-gray-white-bg.png — 200 — 3.4 KiB — 247 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
11% of JavaScript execution is third-party
First-party Third-party 125ms · 293KB · CL$922/mo
Google Tag Manager
Tag Manager
Costly
Execution 66ms
Transfer 160 KB
Unused 45%
Monthly Cost CL$491/mo
Google Tag Manager
Tag Manager
Costly
Execution 58ms
Transfer 133 KB
Unused 53%
Monthly Cost CL$431/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 66ms and costs ~CL$491/month
  • Google Tag Manager adds 58ms and costs ~CL$431/month

Google Tag Manager takes 66ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 58ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

53% of Google Tag Manager's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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