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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
98
GRADE
A+
FIX
1
REVIEW
1
PASS
13
INFO
2

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

Mobile Desktop
100
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
90
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

776 ms

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

901 ms

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.

0.000

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

776 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.

901 ms

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
13 PASS 1 REVIEW 1 FIX
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Image Optimization
9 images, 0 KB saveable
REVIEW
9 images, 0 KB saveable
Info::
All images are well-optimized
9 images 26 KB
0 oversized -0 KB
9 legacy format
0 missing dimensions CLS risk
A+
Page Weight Budget
42 KB transferred, 12 requests
PASS
42 KB transferred, 12 requests
Info::
Page weighs 53 KB (42 KB transferred)
Info::
12 HTTP requests
Info::
Estimated 0.01 g CO2 per page load
42 KB / 2.4 MB budget
42 KB transferred
12 requests
0.01 g CO2 per page load
Images 25.9 KiB 61%
HTML 7.1 KiB 17%
Other 6.7 KiB 16%
CSS 2.5 KiB 6%
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
216ms total JS execution
PASS
216ms total JS execution
Info::
https://filezilla-project.org/: 109ms CPU time
Info::
Unattributable: 107ms CPU time
Info::
Third-party scripts: 107ms (50% of total)

Main Thread Breakdown

Other 52% Style & Layout 29% Script Evaluation 9% Rendering 6%
ScriptTotalScriptingParse/CompileParty
https://filezilla-project.org/109ms11ms2ms1st
Unattributable107ms6ms0ms3rd
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
12 resources · 42 KB · 0 KB savings available
PASS
12 resources · 42 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 42 KB
12 resources · 42.1 KiB · 0 third-party Within 1MB page-weight target
Image 77% · 32.6 KiB
Document 17% · 7.1 KiB
CSS 6% · 2.5 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: Hetzner Online GmbH

Network Waterfall
12 requests over 243ms
INFO
0 ms 200 ms 400 ms 600 ms 800 ms FCP 776 ms LCP 901 mshttps://filezilla-project.org// https://filezilla-project.org/ — 200 — 7.1 KiB — 107 ms — h2https://filezilla-project.org/style.css?v=13/style.css?v=13 https://filezilla-project.org/style.css?v=13 — 200 — 2.5 KiB — 34 ms — h2https://filezilla-project.org/images/sponsors/route4me.png/images/sponsors/route4me.png https://filezilla-project.org/images/sponsors/route4me.png — 200 — 2.3 KiB — 32 ms — h2https://filezilla-project.org/images/sponsors/automatio.png/images/sponsors/automatio.png https://filezilla-project.org/images/sponsors/automatio.png — 200 — 1.1 KiB — 33 ms — h2https://filezilla-project.org/images/sponsors/ndchost.png/images/sponsors/ndchost.png https://filezilla-project.org/images/sponsors/ndchost.png — 200 — 757 B — 34 ms — h2https://filezilla-project.org/images/s_header_bottom.png/images/s_header_bottom.png https://filezilla-project.org/images/s_header_bottom.png — 200 — 1.3 KiB — 34 ms — h2https://filezilla-project.org/images/s_common.png/images/s_common.png https://filezilla-project.org/images/s_common.png — 200 — 15.7 KiB — 32 ms — h2https://filezilla-project.org/images/atomfeed.png/images/atomfeed.png https://filezilla-project.org/images/atomfeed.png — 200 — 1.1 KiB — 32 ms — h2https://filezilla-project.org/images/h3.png/images/h3.png https://filezilla-project.org/images/h3.png — 200 — 1.0 KiB — 33 ms — h2https://filezilla-project.org/images/button.png/images/button.png https://filezilla-project.org/images/button.png — 200 — 1.8 KiB — 33 ms — h2https://filezilla-project.org/images/li.png/images/li.png https://filezilla-project.org/images/li.png — 200 — 822 B — 33 ms — h2https://filezilla-project.org/favicon.ico/favicon.ico https://filezilla-project.org/favicon.ico — 200 — 6.7 KiB — 32 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
50% of JavaScript execution is third-party
First-party Third-party 107ms · 0KB · $1/mo
Unattributable
Other
Optional
Execution 107ms
Transfer 0 KB
Monthly Cost $1/mo

50% 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

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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