Skip to content
https://deno.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
2
REVIEW
4
PASS
6
INFO
2

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

Mobile Desktop
41
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
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.
92
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.

2.45 s

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

5.10 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

1.87 s

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.

11.24 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.

11.20 s

Page Load Progression

1.2 s
2.4 s
3.5 s
4.7 s
5.9 s
7.1 s
8.3 s
9.4 s
Checks
14
6 PASS 4 REVIEW 2 FIX
D
Page Weight Budget
Action
2.5 MB transferred, 104 requests
FIX
2.5 MB transferred, 104 requests
Warning::
Page weighs 4.1 MB (2.5 MB transferred)
Warning::
JavaScript is 562 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 562 KB
Info::
Fonts are 426 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 426 KB
Warning::
104 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.52 g CO2 per page load
2.5 MB / 2.4 MB budget
2.5 MB transferred
104 requests
0.52 g CO2 per page load
Other 1.0 MiB 42%
JavaScript 562.4 KiB 22%
Images 427.2 KiB 17%
Fonts 426.4 KiB 17%
HTML 40.2 KiB 2%
CSS 25.7 KiB 1%
Other 2.0 KiB 0%
Other 1.7 KiB 0%
Other 717 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

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.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

F
JS Execution Cost
Action
12334ms total JS execution
FIX
12334ms total JS execution
Warning::
https://deno.com/scripts/ScrollTrigger.min.js?__fr...: 3990ms CPU time
Warning::
https://deno.com/: 3349ms CPU time
Warning::
Unattributable: 1516ms CPU time
Warning::
https://deno.com/i/static/array.js: 1313ms CPU time
Warning::
https://deno.com/scripts/gsap.min.js?__frsh_c=4632...: 1295ms CPU time
Info::
Third-party scripts: 2150ms (17% of total)

Main Thread Breakdown

Other 41% Style & Layout 27% Script Evaluation 20% Rendering 8%
ScriptTotalScriptingParse/CompileParty
https://deno.com/scripts/ScrollTrigger.min.js?__frsh_c=463284b5b144ab4d58f0467181ce0219895064dd3990ms273ms6ms1st
https://deno.com/3349ms18ms4ms1st
Unattributable1516ms34ms0ms3rd
https://deno.com/i/static/array.js1313ms1152ms22ms1st
https://deno.com/scripts/gsap.min.js?__frsh_c=463284b5b144ab4d58f0467181ce0219895064dd1295ms344ms12ms1st
https://www.googletagmanager.com/gtag/js?id=G-5HMZ6WRNXW&cx=c&gtm=4e6411421ms323ms71ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5B5TH8ZJ213ms158ms45ms3rd
https://deno.com/i/static/posthog-recorder.js?v=1.364.6144ms110ms31ms1st
https://deno.com/_fresh/js/463284b5b144ab4d58f0467181ce0219895064dd/fresh-runtime.js93ms82ms0ms1st
C
Image Optimization
Action
45 images, 0 KB saveable
REVIEW
45 images, 0 KB saveable
Warning::
https://deno.com/runtime/npm.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://deno.com/images/homepage/formatter_lines.s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://deno.com/images/homepage/lofi-hero-clouds.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://deno.com/images/homepage/lofi-hero-fg.webp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://deno.com/images/homepage/code_lines.svg?__... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
45 images 427 KB
0 oversized -0 KB
38 legacy format
5 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Bundles
Action
39 scripts, 243 KB unused
REVIEW
39 scripts, 243 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-5HMZ...: 70 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5B5...: 64 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://deno.com/i/static/posthog-recorder.js?v=1....: 37 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://deno.com/i/static/array.js: 26 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://deno.com/_fresh/js/463284b5b144ab4d58f0467...: 24 KB unused (78%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 243 KB
243 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-5HMZ6WRNXW&cx=c&gtm=4e6411174 KB70 KB (40%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5B5TH8ZJ121 KB64 KB (53%)✓3rd
https://deno.com/i/static/posthog-recorder.js?v=1.364.661 KB37 KB (62%)✓1st
https://deno.com/i/static/array.js55 KB26 KB (47%)✓1st
https://deno.com/_fresh/js/463284b5b144ab4d58f0467181ce0219895064dd/OramaSearch.js30 KB24 KB (78%)✓1st
https://deno.com/i/static/surveys.js?v=1.364.629 KB23 KB (80%)✓1st
https://deno.com/_fresh/js/463284b5b144ab4d58f0467181ce0219895064dd/chunk-DBRIW5XV.js1 KB—✓1st
https://deno.com/_fresh/js/463284b5b144ab4d58f0467181ce0219895064dd/chunk-N46X5JTP.js1 KB—✓1st
https://deno.com/_fresh/js/463284b5b144ab4d58f0467181ce0219895064dd/AutoPlayVideo.js1 KB—✓1st
https://deno.com/scripts/gsap.min.js?__frsh_c=463284b5b144ab4d58f0467181ce0219895064dd27 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

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

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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
public, s-maxage=300
REVIEW
public, s-maxage=300
Info::
Cache-Control header is set
Got: public, s-maxage=300
Info::
CDN TTL: 5 minutes (s-maxage=300)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, s-maxage=300

DirectiveValueMeaning
public—Any cache may store this response
s-maxage300CDN caches for 5 minutes
A+
Third-Party Impact
12% third-party, 0 ms blocking
PASS
12% third-party, 0 ms blocking
Info::
Third-party code accounts for 12% of page weight (295.6 KiB of 2.5 MiB)
Info::
Third-party blocking time is low (0 ms)
88%
First-party Third-party
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+
Font Loading
6 fonts (426 KB)
PASS
6 fonts (426 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

426 KB total

Render-blocking

0

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 2.5 s LCP 5.1 shttps://deno.com/fonts/inter/Inter-Regular.woff2?__frsh_c=463284b5b144ab4d58f0467181ce0219895064ddInter-Regular.woff2 https://deno.com/fonts/inter/Inter-Regular.woff2?__frsh_c=463284b5b144ab4d58f0467181ce0219895064dd — 26.9 KiB — 0 ms — font-display: swaphttps://deno.com/fonts/inter/Inter-SemiBold.woff2?__frsh_c=463284b5b144ab4d58f0467181ce0219895064ddInter-SemiBold.woff2 https://deno.com/fonts/inter/Inter-SemiBold.woff2?__frsh_c=463284b5b144ab4d58f0467181ce0219895064dd — 27.5 KiB — 0 ms — font-display: swaphttps://deno.com/fonts/deploy/Moranga-Regular.woff2?__frsh_c=463284b5b144ab4d58f0467181ce0219895064ddMoranga-Regular.woff2 https://deno.com/fonts/deploy/Moranga-Regular.woff2?__frsh_c=463284b5b144ab4d58f0467181ce0219895064dd — 28.0 KiB — 0 ms — font-display: swaphttps://deno.com/fonts/deploy/Recursive_Variable.woff2?__frsh_c=463284b5b144ab4d58f0467181ce0219895064ddRecursive_Variable.woff2 https://deno.com/fonts/deploy/Recursive_Variable.woff2?__frsh_c=463284b5b144ab4d58f0467181ce0219895064dd — 287.0 KiB — 0 ms — font-display: swaphttps://deno.com/fonts/inter/Inter-Italic.woff2?__frsh_c=463284b5b144ab4d58f0467181ce0219895064ddInter-Italic.woff2 https://deno.com/fonts/inter/Inter-Italic.woff2?__frsh_c=463284b5b144ab4d58f0467181ce0219895064dd — 28.9 KiB — 0 ms — font-display: swaphttps://deno.com/fonts/deploy/Moranga-Medium.woff2?__frsh_c=463284b5b144ab4d58f0467181ce0219895064ddMoranga-Medium.woff2 https://deno.com/fonts/deploy/Moranga-Medium.woff2?__frsh_c=463284b5b144ab4d58f0467181ce0219895064dd — 28.1 KiB — 0 ms — font-display: swap
Inter-Regular.woff2 woff2 swap
Size 27 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Inter-SemiBold.woff2 woff2 swap
Size 27 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Moranga-Regular.woff2 woff2 swap
Size 28 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Recursive_Variable.woff2 woff2 swap
Size 287 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Inter-Italic.woff2 woff2 swap
Size 29 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Moranga-Medium.woff2 woff2 swap
Size 28 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
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 ~144 KB and ~288 ms

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
4 hints, 0 missing preconnects
PASS
4 hints, 0 missing preconnects
Info::
Page uses 4 resource hint(s)

Current Resource Hints

preconnect
—
preload
4
dns-prefetch
—
prefetch
—

4 resource hints configured

Network Waterfall
104 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
17% of JavaScript execution is third-party
First-party Third-party 2150ms · 295KB · €23/mo
Unattributable
Other
Costly
Execution 1516ms
Transfer 0 KB
Monthly Cost €16/mo
Google Tag Manager
Tag Manager
Costly
Execution 421ms
Transfer 174 KB
Unused 40%
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 213ms
Transfer 121 KB
Unused 53%
Monthly Cost €2/mo

These scripts may cost more than they're worth

  • Unattributable adds 1516ms and costs ~€16/month
  • Google Tag Manager adds 421ms and costs ~€5/month
  • Google Tag Manager adds 213ms and costs ~€2/month

Unattributable takes 1516ms 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 421ms 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 213ms 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.

Send Feedback