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.
597 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.33 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
41 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.006
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
597 ms
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
1.49 s
Page Load Progression
CJS Execution CostAction1205ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://bazicalculator.pro/ | 716ms | 14ms | 14ms | 1st |
| https://bazicalculator.pro/_next/static/chunks/9448-2278cfb833bb224e.js | 215ms | 195ms | 7ms | 1st |
| Unattributable | 152ms | 8ms | 0ms | 1st |
| https://bazicalculator.pro/_next/static/chunks/webpack-cceb4ab57a5ecd29.js | 121ms | 115ms | 0ms | 1st |
CMain HTML Cache-ControlActionMain HTML max-age=14400 (~240min) is aggressiveREVIEW
APage Weight Budget780 KB transferred, 79 requestsPASS
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
A+Third-Party Impact1% third-party, 0 ms blockingPASS
A+Text CompressionAll text resources are compressedPASS
A+Image Optimization2 images, 0 KB saveablePASS
A+Font Loading5 fonts (267 KB)PASS
Web fonts
5
267 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
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 ~82 KB and ~164 ms
A+JS Bundles43 scripts, 21 KB unusedPASS
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://bazicalculator.pro/_next/static/chunks/fae1a7c7-071b2102016d171c.js | 63 KB | 21 KB (34%) | ✓ | 1st |
| https://bazicalculator.pro/_next/static/chunks/5737-2783346c8208f291.js | 4 KB | — | ✓ | 1st |
| https://bazicalculator.pro/_next/static/chunks/4166-f49b8fbb5527a47e.js | 10 KB | — | ✓ | 1st |
| https://bazicalculator.pro/_next/static/chunks/app/%5Blocale%5D/(marketing)/layout-c2605fd60fd7815c.js | 1 KB | — | ✓ | 1st |
| https://bazicalculator.pro/_next/static/chunks/main-app-9bfaadb7950adf35.js | 1 KB | — | ✓ | 1st |
| https://bazicalculator.pro/_next/static/chunks/app/not-found-243feb25ce07def7.js | 3 KB | — | ✓ | 1st |
| https://bazicalculator.pro/_next/static/chunks/1720-fc278677fba9af12.js | 16 KB | — | ✓ | 1st |
| https://bazicalculator.pro/_next/static/chunks/2815-ce1179557f01d7ee.js | 9 KB | — | ✓ | 1st |
| https://bazicalculator.pro/_next/static/chunks/5248-165c289c437c1df3.js | 4 KB | — | ✓ | 1st |
| https://bazicalculator.pro/_next/static/chunks/6163-1b3abba0502f95df.js | 12 KB | — | ✓ | 1st |
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
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+HTTP/3 (QUIC)HTTP/3 advertised via Alt-SvcPASS
A+Document CompressionDocument response uses brotliPASS
A+LCP Image PreloadLCP preload audit not availablePASS
A+Server-Timing Observability4 Server-Timing entries advertisedPASS
A+Server Response Intelligence2 server-response signal(s) detectedPASS
A+Page Weight Inventory79 resources · 780 KB · 21 KB savings availablePASS
~21.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 79 resources | 779.7 KiB | ||||||
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
A+HTTP Cachingmax-age=14400 (4 hours)PASS
public, max-age=14400, s-maxage=3600
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 14400 | Cache for 4 hours |
| s-maxage | 3600 | CDN caches for 1 hour |
Asset CompressionNo text asset hosts to measureINFO
Network Waterfall79 requests over 5212msINFO
Image Optimization1 images, 37 KB total, 31 KB wastedINFO
Image Optimization Audit
Total Images
1
Total Size
37 KB
Oversized
1
Wasted
31 KB