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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
1
REVIEW
5
PASS
6
INFO
2

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

Mobile Desktop
81
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
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.
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.

1.04 s

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

2.59 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.

0.029

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.

2.59 s

Page Load Progression

615 ms
1.2 s
1.8 s
2.5 s
3.1 s
3.7 s
4.3 s
4.9 s
Checks
14
6 PASS 5 REVIEW 1 FIX
D
Page Weight Budget
Action
2.1 MB transferred, 35 requests
FIX
2.1 MB transferred, 35 requests
Info::
Page weighs 3.5 MB (2.1 MB transferred)
Warning::
Images are 1.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.2 MB
Info::
Fonts are 409 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 409 KB
Info::
35 HTTP requests
Info::
Estimated 0.45 g CO2 per page load
2.1 MB / 2.4 MB budget
2.1 MB transferred
35 requests
0.45 g CO2 per page load
Images 1.2 MiB 57%
JavaScript 419.9 KiB 19%
Fonts 409.2 KiB 19%
CSS 78.4 KiB 4%
Other 15.1 KiB 1%
HTML 8.1 KiB 0%
Other 7.0 KiB 0%
Other 3.1 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

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

C
Image Optimization
Action
13 images, 0 KB saveable
REVIEW
13 images, 0 KB saveable
Warning::
https://www.eclipse.org/eclipse.org-common/themes/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://newsroom.eclipse.org/sites/default/files/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.eclipse.org/eclipse.org-common/themes/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
13 images 1.2 MB
0 oversized -0 KB
5 legacy format
3 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

B
JS Execution Cost
815ms total JS execution
REVIEW
815ms total JS execution
Warning::
https://www.eclipse.org/public/js/main.js?v1.0?v=1...: 464ms CPU time
Info::
https://www.eclipse.org/: 206ms CPU time
Info::
Unattributable: 79ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-5WL...: 66ms CPU time
Info::
Third-party scripts: 145ms (18% of total)

Main Thread Breakdown

Script Evaluation 34% Other 24% Style & Layout 22% Rendering 11% Script Parsing & Compilation 4% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.eclipse.org/public/js/main.js?v1.0?v=1775577514464ms219ms21ms1st
https://www.eclipse.org/206ms5ms1ms1st
Unattributable79ms5ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5WLCZXC66ms51ms12ms3rd
C
JS Bundles
Action
2 scripts, 211 KB unused
REVIEW
2 scripts, 211 KB unused
Warning::
https://www.eclipse.org/public/js/main.js?v1.0?v=1...: 144 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5WL...: 67 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 211 KB
211 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.eclipse.org/public/js/main.js?v1.0?v=1775577514294 KB144 KB (49%)✓1st
https://www.googletagmanager.com/gtm.js?id=GTM-5WLCZXC126 KB67 KB (53%)✓3rd

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
private, max-age=8m, no-transform
REVIEW
private, max-age=8m, no-transform
Info::
Cache-Control header is set
Got: private, max-age=8m, no-transform
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

private, max-age=8m, no-transform

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
max-age8mCache duration
no-transform—
A
Third-Party Impact
25% third-party, 0 ms blocking
PASS
25% third-party, 0 ms blocking
Info::
Third-party code accounts for 25% of page weight (551.7 KiB of 2.1 MiB)
Info::
Third-party blocking time is low (0 ms)
75%
25%
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 (409 KB)
PASS
6 fonts (409 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

409 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 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.0 s LCP 2.6 shttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2UcC73FwrK3iLTeHuS_nVMrM... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 47.3 KiB — 0 ms — font-display: swaphttps://www.eclipse.org/public/fonts/vendor/@fortawesome/fontawesome-free/webfa-solid-900.woff2?2463b90d9a316e4e5294e6706b6a7a72webfa-solid-900.woff2 https://www.eclipse.org/public/fonts/vendor/@fortawesome/fontawesome-free/webfa-solid-900.woff2?2463b90d9a316e4e5294e6706b6a7a72 — 155.1 KiB — 0 ms — font-display: swaphttps://www.eclipse.org/public/fonts/vendor/@fortawesome/fontawesome-free/webfa-regular-400.woff2?89999bdf5d835c0120257222e5568fecwebfa-regular-400.woff2 https://www.eclipse.org/public/fonts/vendor/@fortawesome/fontawesome-free/webfa-regular-400.woff2?89999bdf5d835c0120257222e5568fec — 25.3 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/inconsolata/v37/QlddNThLqRwH-OJ1UHjlKENVzkWGVkL3GZQmAwLyya15IDhunA.woff2QlddNThLqRwH-OJ1UHjlKEN... https://fonts.gstatic.com/s/inconsolata/v37/QlddNThLqRwH-OJ1UHjlKENVzkWGVkL3GZQmAwLyya15IDhunA.woff2 — 28.4 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 0 ms — font-display: swaphttps://www.eclipse.org/public/fonts/vendor/@fortawesome/fontawesome-free/webfa-brands-400.woff2?c210719e60948b211a1260f79812efe5webfa-brands-400.woff2 https://www.eclipse.org/public/fonts/vendor/@fortawesome/fontawesome-free/webfa-brands-400.woff2?c210719e60948b211a1260f79812efe5 — 116.4 KiB — 0 ms — font-display: swap
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 47 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
webfa-solid-900.woff2 woff2 swap
Size 155 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
webfa-regular-400.woff2 woff2 swap
Size 25 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
QlddNThLqRwH-OJ1UHjlKEN... woff2 swap
Size 28 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
webfa-brands-400.woff2 woff2 swap
Size 116 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
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 ~136 KB and ~272 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
35 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
18% of JavaScript execution is third-party
First-party Third-party 145ms · 126KB · €0/mo
Unattributable
Other
Optional
Execution 79ms
Transfer 0 KB
Monthly Cost €0/mo
Google Tag Manager
Tag Manager
Optional
Execution 66ms
Transfer 126 KB
Unused 53%
Monthly Cost €0/mo

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.

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