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https://curl.se

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
96
GRADE
A
FIX
0
REVIEW
1
PASS
14
INFO
2

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

Mobile Desktop
99
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
78
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.
75
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.

939 ms

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

1.05 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.

0.072

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

1.82 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.

1.05 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
17
14 PASS 1 REVIEW
C
Image Optimization
Action
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Warning::
https://curl.se/logo/curl-30-years.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://curl.se/pix/haxx.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://curl.se/pix/top/github.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://curl.se/pix/teamviewer.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://curl.se/pix/everything-curl.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://curl.se/pix/mastering.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://curl.se/pix/wolfssl.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://curl.se/pix/fastly.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://curl.se/pix/user.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://curl.se/pix/cash.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
11 images 80 KB
0 oversized -0 KB
11 legacy format
10 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

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

A+
Page Weight Budget
92 KB transferred, 15 requests
PASS
92 KB transferred, 15 requests
Info::
Page weighs 135 KB (92 KB transferred)
Info::
15 HTTP requests
Info::
Estimated 0.02 g CO2 per page load
92 KB / 2.4 MB budget
92 KB transferred
15 requests
0.02 g CO2 per page load
Images 79.9 KiB 87%
HTML 4.6 KiB 5%
Other 3.6 KiB 4%
CSS 3.5 KiB 4%
0 2.4 MB 4.9 MB
Under budget
A+
Third-Party Impact
No third-party resources
PASS
No third-party resources
Info::
No third-party resources detected
No third-party resources detected — all resources are first-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+
JS Execution Cost
357ms total JS execution
PASS
357ms total JS execution
Info::
Unattributable: 216ms CPU time
Info::
https://curl.se/: 141ms CPU time
Warning::
Third-party scripts: 216ms (60% of total)

Main Thread Breakdown

Other 65% Style & Layout 21% Rendering 8% Script Evaluation 3%
ScriptTotalScriptingParse/CompileParty
Unattributable216ms6ms0ms3rd
https://curl.se/141ms3ms1ms1st
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+
JS Bundles
No JavaScript
PASS
No JavaScript
Info::
No JavaScript bundles
No JavaScript files loaded.
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+
Page Weight Inventory
15 resources · 92 KB · 0 KB savings available
PASS
15 resources · 92 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 92 KB
15 resources · 91.6 KiB · 0 third-party Within 1MB page-weight target
Image 91% · 83.5 KiB
Document 5% · 4.6 KiB
CSS 4% · 3.5 KiB
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Axis12 Ltd

A+
HTTP Caching
max-age=60 (1 minute)
PASS
max-age=60 (1 minute)
Info::
Cache-Control header is set
Got: max-age=60
Info::
Effective TTL: 1 minute (max-age=60)
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

max-age=60

DirectiveValueMeaning
max-age60Cache for 1 minute
Effective TTL: 60 seconds
Network Waterfall
15 requests over 1431ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 939 ms LCP 1.1 shttps://curl.se// https://curl.se/ — 200 — 4.6 KiB — 787 ms — h2https://curl.se/curl.css/curl.css https://curl.se/curl.css — 200 — 3.5 KiB — 149 ms — h2https://curl.se/logo/curl-white-symbol.svg/logo/curl-white-symbol.svg https://curl.se/logo/curl-white-symbol.svg — 200 — 544 B — 148 ms — h2https://curl.se/logo/curl-30-years.svg/logo/curl-30-years.svg https://curl.se/logo/curl-30-years.svg — 200 — 2.0 KiB — 139 ms — h2https://curl.se/pix/haxx.svg/pix/haxx.svg https://curl.se/pix/haxx.svg — 200 — 1.2 KiB — 159 ms — h2https://curl.se/pix/wolfssl.svg/pix/wolfssl.svg https://curl.se/pix/wolfssl.svg — 200 — 3.0 KiB — 150 ms — h2https://curl.se/pix/fastly.svg/pix/fastly.svg https://curl.se/pix/fastly.svg — 200 — 1.7 KiB — 150 ms — h2https://curl.se/pix/top/github.svg/pix/top/github.svg https://curl.se/pix/top/github.svg — 200 — 1.5 KiB — 286 ms — h2https://curl.se/pix/teamviewer.svg/pix/teamviewer.svg https://curl.se/pix/teamviewer.svg — 200 — 4.2 KiB — 284 ms — h2https://curl.se/pix/user.svg/pix/user.svg https://curl.se/pix/user.svg — 200 — 1.1 KiB — 308 ms — h2https://curl.se/pix/everything-curl.jpg/pix/everything-curl.jpg https://curl.se/pix/everything-curl.jpg — 200 — 34.7 KiB — 327 ms — h2https://curl.se/pix/cash.svg/pix/cash.svg https://curl.se/pix/cash.svg — 200 — 1.4 KiB — 153 ms — h2https://curl.se/pix/mastering.jpg/pix/mastering.jpg https://curl.se/pix/mastering.jpg — 200 — 28.5 KiB — 274 ms — h2https://curl.se/logo/curl-symbol.svg/logo/curl-symbol.svg https://curl.se/logo/curl-symbol.svg — 200 — 727 B — 137 ms — h3https://curl.se/favicon.ico/favicon.ico https://curl.se/favicon.ico — 200 — 2.9 KiB — 137 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
60% of JavaScript execution is third-party
First-party Third-party 216ms · 0KB · kr23/mo
Unattributable
Other
Costly
Execution 216ms
Transfer 0 KB
Monthly Cost kr23/mo

These scripts may cost more than they're worth

  • Unattributable adds 216ms and costs ~kr23/month

60% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 216ms 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

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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