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.
1.73 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.21 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
0 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.005
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.73 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.
2.22 s
Page Load Progression
DPage Weight BudgetAction2.2 MB transferred, 84 requestsFIX
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
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS BundlesAction43 scripts, 428 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://script.crazyegg.com/scripts/addons/1.0.146/survey.js | 100 KB | 74 KB (77%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-6E9Q4KD1X0&cx=c>m=4e64h1 | 171 KB | 68 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-959285871&cx=c>m=4e64h1 | 145 KB | 65 KB (45%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-KJQCH7P | 173 KB | 64 KB (37%) | ✓ | 3rd |
| https://cdn.intellimize.co/snippet/117475503.js | 87 KB | 60 KB (69%) | ✓ | 3rd |
| https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js | 55 KB | 26 KB (48%) | ✓ | 3rd |
| https://cdn.jsdelivr.net/npm/swiper@12/swiper-bundle.min.js | 44 KB | 25 KB (58%) | ✓ | 3rd |
| https://cdn.flowblock.co/public/files/68e91c7073e805ab57462f0c/gsap.js | 47 KB | 24 KB (52%) | ✓ | 3rd |
| https://cdn.heapanalytics.com/js/heap-318805607.js | 41 KB | 23 KB (56%) | ✓ | 3rd |
| https://cdn.prod.website-files.com/687904fb2b26c434698c47e9/js/fs-teachable.achunk.5959ac50b3c857f1.js | 1 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 InventoryAction84 resources · 2.2 MB · 428 KB savings availableFIX
~428.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 84 resources | 2.2 MiB | ||||||
BImage Optimization14 images, 0 KB saveableREVIEW
BJS Execution Cost818ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.teachable.com/ | 228ms | 37ms | 6ms | 3rd |
| https://cdn.prod.website-files.com/gsap/3.15.0/gsap.min.js | 188ms | 37ms | 2ms | 3rd |
| Unattributable | 96ms | 4ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-6E9Q4KD1X0&cx=c>m=4e64h1 | 92ms | 81ms | 10ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-KJQCH7P | 91ms | 76ms | 12ms | 3rd |
| https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js | 63ms | 57ms | 3ms | 3rd |
| https://cdn.prod.website-files.com/gsap/3.15.0/ScrollTrigger.min.js | 60ms | 18ms | 1ms | 3rd |
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
BHTTP CachingprivateREVIEW
private
| Directive | Value | Meaning |
|---|---|---|
| private | — | Only browser cache, not CDN/proxy |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading3 fonts (357 KB)PASS
Web fonts
3
357 KB total
Render-blocking
0
of 3
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 ~85 KB and ~170 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall84 requests over 2166msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.teachable.com www.teachable.com | Other | 228ms | 39 KB | — | €2/mo | Costly |
cdn.prod.website-files.com cdn.prod.website-files.com | Other | 188ms | 29 KB | — | €2/mo | Optional |
Unattributable Unattributable | Other | 96ms | 0 KB | — | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 92ms | 171 KB | 40% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 91ms | 173 KB | 37% | €1/mo | Optional |
script.crazyegg.com script.crazyegg.com | Other | 63ms | 55 KB | 48% | €1/mo | Optional |
cdn.prod.website-files.com cdn.prod.website-files.com | Other | 60ms | 18 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.teachable.com adds 228ms and costs ~€2/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
www.teachable.com takes 228ms 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