Performance
· 22 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.
1.48 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.48 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
43 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.115
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.
2.90 s
Page Load Progression
DPage Weight BudgetAction2.2 MB transferred, 27 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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS BundlesAction7 scripts, 488 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-5C7GQG0Z5X&cx=c>m=4e67a1 | 155 KB | 110 KB (71%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=G-5C7GQG0Z5X&cx=c>m=4e67a1 | 156 KB | 110 KB (71%) | ✓ | 3rd |
| https://www.servtop.com.br/assets/index-BREqxRHb.js | 178 KB | 84 KB (47%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-5C7GQG0Z5X | 155 KB | 66 KB (42%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5NZ3WFF | 125 KB | 62 KB (50%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-340216930&cx=c>m=4e67a1 | 140 KB | 56 KB (40%) | ✓ | 3rd |
| https://googleads.g.doubleclick.net/pagead/viewthroughconversion/340216930/?random=1783986956406&cv=11&fst=1783986956406&bg=ffffff&guid=ON&async=1&en=gtag.config>m=45be67a1za200zb855114936zd855114936xec&gcd=13l3l3l3l1l1&dma=0&tag_exp=115938466~115938469~118012009~118826210~118897920~118897930~119027224&u_w=800&u_h=600&url=https%3A%2F%2Fwww.servtop.com.br%2F&rcb=2&frm=0&tiba=ServTop%20-%20Instala%C3%A7%C3%A3o%20de%20pisos%20laminados%20e%20vin%C3%ADlicos&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=177136309.1783986956&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=0&uam=&uap=macOS&uapv=10.15.7&uaw=0&data=event%3Dgtag.config&ept=9&rfmt=3&fmt=4 | 3 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 InventoryAction27 resources · 2.2 MB · 488 KB savings availableFIX
~487.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 27 resources | 2.2 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization8 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
BJS Execution Cost542ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.servtop.com.br/assets/index-BREqxRHb.js | 157ms | 48ms | 1ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-5C7GQG0Z5X | 89ms | 74ms | 15ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-340216930&cx=c>m=4e67a1 | 87ms | 73ms | 14ms | 3rd |
| Unattributable | 83ms | 2ms | 0ms | 1st |
| https://www.servtop.com.br/ | 64ms | 12ms | 1ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5NZ3WFF | 62ms | 50ms | 12ms | 3rd |
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
CCompression AlgorithmActionMain response served uncompressedREVIEW
BMain HTML Cache-ControlNo Cache-Control header on main HTML responseREVIEW
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
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 (83 KB)PASS
Web fonts
3
83 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+LCP Image PreloadLCP preload audit not availablePASS
A+Server Response Intelligence1 server-response signal(s) detectedPASS
Network Waterfall27 requests over 1740msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.servtop.com.br www.servtop.com.br | Other | 157ms | 178 KB | 47% | R$2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 89ms | 155 KB | 42% | R$1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 87ms | 140 KB | 40% | R$1/mo | Optional |
www.servtop.com.br www.servtop.com.br | Other | 64ms | 1 KB | — | R$1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 62ms | 125 KB | 50% | R$1/mo | Optional |
85% 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
Image Optimization37 images, 1172 KB total, 762 KB wastedINFO
Image Optimization Audit
Total Images
37
Total Size
1172 KB
Oversized
4
Wasted
762 KB