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https://he.net

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
87
GRADE
B
FIX
1
REVIEW
6
PASS
8
INFO
2

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

Mobile Desktop
89
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
73
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.
83
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.

1.25 s

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

3.03 s

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

130 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.117

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

1.52 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.

4.03 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
8 PASS 6 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.

C
Page Weight Budget
Action
1.9 MB transferred, 10 requests
REVIEW
1.9 MB transferred, 10 requests
Info::
Page weighs 2.1 MB (1.9 MB transferred)
Warning::
Images are 1.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.7 MB
Info::
10 HTTP requests
Info::
Estimated 0.39 g CO2 per page load
1.9 MB / 2.4 MB budget
1.9 MB transferred
10 requests
0.39 g CO2 per page load
Images 1.7 MiB 91%
JavaScript 155.1 KiB 8%
HTML 5.7 KiB 0%
Other 1.5 KiB 0%
Other 21 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

C
Image Optimization
Action
5 images, 0 KB saveable
REVIEW
5 images, 0 KB saveable
Warning::
https://he.net/images/helogo.gif is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://he.net/images/homepage-smallmap.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://he.net/3d-map/images/3d-map-thumbnail-170p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://he.net/images/homepage-smallcert.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://he.net/images/homepage-smallcolo.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
5 images 1.7 MB
0 oversized -0 KB
5 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

B
JS Execution Cost
927ms total JS execution
REVIEW
927ms total JS execution
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-106...: 354ms CPU time
Warning::
https://he.net/: 292ms CPU time
Warning::
Unattributable: 281ms CPU time
Warning::
Third-party scripts: 635ms (69% of total)

Main Thread Breakdown

Script Evaluation 35% Other 34% Style & Layout 15% Script Parsing & Compilation 9% Rendering 6%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtag/js?id=AW-1068215855354ms283ms66ms3rd
https://he.net/292ms22ms6ms1st
Unattributable281ms9ms0ms3rd
B
JS Bundles
2 scripts, 60 KB unused
REVIEW
2 scripts, 60 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-106...: 60 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 60 KB
60 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=AW-1068215855138 KB60 KB (44%)✓3rd
https://ssl.google-analytics.com/ga.js17 KB—✓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

C
Page Weight Inventory
Action
10 resources · 1.9 MB · 60 KB savings available
REVIEW
10 resources · 1.9 MB · 60 KB savings available
Warning::
Page weight 873 KB over 1MB target
Got: 1.9 MB Expected: ≤ 1 MB
Info::
~60 KB of savings available
Info::
3 third-party resources (8% of weight)
Info::
1 resources over 200KB
10 resources · 1.9 MiB · 3 third-party 873.4 KiB over 1MB target
Image 92% · 1.7 MiB
JavaScript 8% · 155.1 KiB
Document 0% · 5.7 KiB
Other 0% · 21 B

~60.1 KiB of savings available

Remove unused JavaScript: 60.1 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Third-Party Impact
8% third-party, 0 ms blocking
PASS
8% third-party, 0 ms blocking
Info::
Third-party code accounts for 8% of page weight (155.1 KiB of 1.9 MiB)
Info::
Third-party blocking time is low (0 ms)
92%
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
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+
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+
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
Network Waterfall
10 requests over 1669ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.2 s LCP 3.0 shttps://he.net// https://he.net/ — 200 — 5.7 KiB — 415 ms — http/1.1https://www.googletagmanager.com/gtag/js?id=AW-1068215855www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=AW-1068215855 — 200 — 137.7 KiB — 36 ms — h2https://he.net/images/helogo.gif/images/helogo.gif https://he.net/images/helogo.gif — 200 — 4.5 KiB — 142 ms — http/1.1https://he.net/images/homepage-smallmap.png/images/homepage-smallmap.png https://he.net/images/homepage-smallmap.png — 200 — 31.4 KiB — 271 ms — http/1.1https://he.net/3d-map/images/3d-map-thumbnail-170px.gif/3d-map/images/3d-map-thumbnail-170... https://he.net/3d-map/images/3d-map-thumbnail-170px.gif — 200 — 1.6 MiB — 1.1 s — http/1.1https://he.net/images/homepage-smallcert.png/images/homepage-smallcert.png https://he.net/images/homepage-smallcert.png — 200 — 40.5 KiB — 533 ms — http/1.1https://he.net/images/homepage-smallcolo.png/images/homepage-smallcolo.png https://he.net/images/homepage-smallcolo.png — 200 — 47.7 KiB — 667 ms — http/1.1https://ssl.google-analytics.com/ga.jsssl.google-analytics.com/ga.js https://ssl.google-analytics.com/ga.js — 200 — 17.4 KiB — 17 ms — h2https://www.google.com/ccm/collect?rcb=15&frm=0&en=page_view&dl=https%3A%2F%2Fhe.net%2F&scrsrc=www.googletagmanager.com&rnd=677150606.1776902021&dt=Hurricane%20Electric%20Internet%20Services%20-%20Internet%20Backbone%20and%20Colocation%20Provider&auid=40374908.1776902021&navt=n&npa=1&gtm=45be64k1v898168298za200zd898168298xec&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938465~115938469~117266400&apve=1&apvf=f&apvc=1&tids=AW-1068215855&tid=AW-1068215855&tft=1776902020632&tfd=592www.google.com/ccm/collect?rcb=15&f... https://www.google.com/ccm/collect?rcb=15&frm=0&en=page_view&dl=https%3A%2F%2Fhe.net%2F&scrsrc=www.googletagmanager.com&rnd=677150606.1776902021&dt=Hurricane%20Electric%20Internet%20Services%20-%20Internet%20Backbone%20and%20Colocation%20Provider&auid=40374908.1776902021&navt=n&npa=1&gtm=45be64k1v898168298za200zd898168298xec&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938465~115938469~117266400&apve=1&apvf=f&apvc=1&tids=AW-1068215855&tid=AW-1068215855&tft=1776902020632&tfd=592 — 200 — 21 B — 21 ms — h3https://he.net/favicon.ico/favicon.ico https://he.net/favicon.ico — 200 — 1.5 KiB — 136 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
69% of JavaScript execution is third-party
First-party Third-party 635ms · 138KB · €7/mo
Google Tag Manager
Tag Manager
Costly
Execution 354ms
Transfer 138 KB
Unused 44%
Monthly Cost €4/mo
Unattributable
Other
Costly
Execution 281ms
Transfer 0 KB
Monthly Cost €3/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 354ms and costs ~€4/month
  • Unattributable adds 281ms and costs ~€3/month

69% 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

Google Tag Manager takes 354ms 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

Unattributable takes 281ms 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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