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https://nabble.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
92
GRADE
A
FIX
0
REVIEW
5
PASS
10
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.
97
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
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.

1.96 s

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

3.04 s

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

52 ms

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

0.229

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

2.02 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.

4.62 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
10 PASS 5 REVIEW
B
Third-Party Impact
57% third-party, 0 ms blocking
REVIEW
57% third-party, 0 ms blocking
Warning::
Third-party code accounts for 57% of page weight (198.9 KiB of 347.6 KiB)
Info::
Third-party blocking time is low (0 ms)
43%
57%
First-party Third-party
B
JS Execution Cost
543ms total JS execution
REVIEW
543ms total JS execution
Info::
https://nabble.com/: 176ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-GRXY...: 167ms CPU time
Info::
Unattributable: 142ms CPU time
Info::
https://www.google-analytics.com/analytics.js: 58ms CPU time
Warning::
Third-party scripts: 367ms (68% of total)

Main Thread Breakdown

Script Evaluation 44% Other 22% Style & Layout 21% Script Parsing & Compilation 6% Rendering 6%
ScriptTotalScriptingParse/CompileParty
https://nabble.com/176ms6ms1ms1st
https://www.googletagmanager.com/gtag/js?id=G-GRXYWF4WWB&cx=c&_slc=1167ms134ms29ms3rd
Unattributable142ms54ms0ms3rd
https://www.google-analytics.com/analytics.js58ms48ms4ms3rd
B
JS Bundles
2 scripts, 64 KB unused
REVIEW
2 scripts, 64 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-GRXY...: 64 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 64 KB
64 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-GRXYWF4WWB&cx=c&_slc=1147 KB64 KB (44%)✓3rd
https://www.google-analytics.com/analytics.js21 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
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
max-age=0
REVIEW
max-age=0
Info::
Cache-Control header is set
Got: max-age=0
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

max-age=0

DirectiveValueMeaning
max-age0Cache for 0 seconds
A+
Page Weight Budget
348 KB transferred, 15 requests
PASS
348 KB transferred, 15 requests
Info::
Page weighs 646 KB (348 KB transferred)
Info::
15 HTTP requests
Info::
Estimated 0.07 g CO2 per page load
348 KB / 2.4 MB budget
348 KB transferred
15 requests
0.07 g CO2 per page load
JavaScript 168.2 KiB 48%
Fonts 91.8 KiB 26%
Images 44.5 KiB 13%
CSS 30.3 KiB 9%
HTML 10.3 KiB 3%
Other 1.5 KiB 0%
Other 545 B 0%
Other 461 B 0%
0 2.4 MB 4.9 MB
Under budget
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
Image Optimization
2 images, 0 KB saveable
PASS
2 images, 0 KB saveable
Warning::
https://nabble.com/assets/images/home.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
2 images 45 KB
0 oversized -0 KB
2 legacy format
1 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

A+
Font Loading
4 fonts (92 KB)
PASS
4 fonts (92 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

92 KB total

Render-blocking

0

of 4

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 FCP 2.0 s LCP 3.0 shttps://fonts.gstatic.com/s/oswald/v57/TK3_WkUHHAIjg75cFRf3bXL8LICs1_FvsUZiZSSShiA.woff2TK3_WkUHHAIjg75cFRf3bXL... https://fonts.gstatic.com/s/oswald/v57/TK3_WkUHHAIjg75cFRf3bXL8LICs1_FvsUZiZSSShiA.woff2 — 12.0 KiB — 31 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2S6uyw4BMUTPHjx4wXiWtFCc... https://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2 — 13.7 KiB — 41 ms — font-display: swaphttps://nabble.com/assets/font-awesome/fonts/fontawesome-webfont.woff2?v=4.4.0fontawesome-webfont.woff2 https://nabble.com/assets/font-awesome/fonts/fontawesome-webfont.woff2?v=4.4.0 — 63.2 KiB — 498 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjxAwXiWtFCfQ7A.woff2S6uyw4BMUTPHjxAwXiWtFCf... https://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjxAwXiWtFCfQ7A.woff2 — 2.9 KiB — 32 ms — font-display: swap
TK3_WkUHHAIjg75cFRf3bXL... woff2 swap
Size 12 KB
Load time 31 ms
Start 792 ms
Risk FOUT — text flashes from fallback to web font
S6uyw4BMUTPHjx4wXiWtFCc... woff2 swap
Size 14 KB
Load time 41 ms
Start 793 ms
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.woff2 unknown swap
Size 63 KB
Load time 498 ms
Start 793 ms
Risk FOUT — text flashes from fallback to web font
S6uyw4BMUTPHjxAwXiWtFCf... woff2 swap
Size 3 KB
Load time 32 ms
Start 793 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 ~19 KB and ~38 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
A
Page Weight Inventory
15 resources · 348 KB · 64 KB savings available
PASS
15 resources · 348 KB · 64 KB savings available
Info::
Within 1MB page-weight target
Got: 348 KB
Info::
~64 KB of savings available
Warning::
8 third-party resources (57% of weight)
15 resources · 347.6 KiB · 8 third-party Within 1MB page-weight target
JavaScript 48% · 168.2 KiB
Font 26% · 91.8 KiB
Image 13% · 44.5 KiB
CSS 9% · 30.3 KiB
Document 3% · 11.8 KiB
Other 0% · 1006 B

~64.5 KiB of savings available

Remove unused JavaScript: 64.5 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
Network Waterfall
15 requests over 1425ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 2.0 s LCP 3.0 shttps://nabble.com// https://nabble.com/ — 200 — 10.3 KiB — 505 ms — http/1.1https://fonts.googleapis.com/css?family=Lato|Oswaldfonts.googleapis.com/css?family=Lat... https://fonts.googleapis.com/css?family=Lato|Oswald — 200 — 1.1 KiB — 116 ms — h2https://nabble.com/assets/font-awesome/css/font-awesome.min.css?14/assets/font-awesome/css/font-aweso... https://nabble.com/assets/font-awesome/css/font-awesome.min.css?14 — 200 — 26.3 KiB — 255 ms — http/1.1https://nabble.com/assets/global.css?14/assets/global.css?14 https://nabble.com/assets/global.css?14 — 200 — 2.9 KiB — 130 ms — http/1.1https://nabble.com/assets/images/logo_nabble_home.png/assets/images/logo_nabble_home.png https://nabble.com/assets/images/logo_nabble_home.png — 200 — 1.6 KiB — 258 ms — http/1.1https://nabble.com/assets/images/home.png/assets/images/home.png https://nabble.com/assets/images/home.png — 200 — 42.9 KiB — 501 ms — http/1.1https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 77 ms — h2https://fonts.gstatic.com/s/oswald/v57/TK3_WkUHHAIjg75cFRf3bXL8LICs1_FvsUZiZSSShiA.woff2fonts.gstatic.com/s/oswald/v57/TK3_... https://fonts.gstatic.com/s/oswald/v57/TK3_WkUHHAIjg75cFRf3bXL8LICs1_FvsUZiZSSShiA.woff2 — 200 — 12.0 KiB — 31 ms — h3https://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2fonts.gstatic.com/s/lato/v25/S6uyw4... https://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2 — 200 — 13.7 KiB — 41 ms — h3https://nabble.com/assets/font-awesome/fonts/fontawesome-webfont.woff2?v=4.4.0/assets/font-awesome/fonts/fontawes... https://nabble.com/assets/font-awesome/fonts/fontawesome-webfont.woff2?v=4.4.0 — 200 — 63.2 KiB — 498 ms — http/1.1https://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjxAwXiWtFCfQ7A.woff2fonts.gstatic.com/s/lato/v25/S6uyw4... https://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjxAwXiWtFCfQ7A.woff2 — 200 — 2.9 KiB — 32 ms — h3https://www.google-analytics.com/j/collect?v=1&_v=j102&a=1528082895&t=pageview&_s=1&dl=https%3A%2F%2Fnabble.com%2F&ul=en-us&dt=Nabble%20%E2%80%A2%20Free%20Forum%20%E2%80%A2%20Embeddable%20Web%20Apps&sr=412x823&vp=412x823&_u=IEBAAEABAAAAACAAI~&jid=1553142338&gjid=1733039786&cid=1345354709.1776894396&tid=UA-91855-9&_gid=1558382224.1776894396&_r=1&_slc=1&z=588745051www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&a=1528082895&t=pageview&_s=1&dl=https%3A%2F%2Fnabble.com%2F&ul=en-us&dt=Nabble%20%E2%80%A2%20Free%20Forum%20%E2%80%A2%20Embeddable%20Web%20Apps&sr=412x823&vp=412x823&_u=IEBAAEABAAAAACAAI~&jid=1553142338&gjid=1733039786&cid=1345354709.1776894396&tid=UA-91855-9&_gid=1558382224.1776894396&_r=1&_slc=1&z=588745051 — 200 — 461 B — 34 ms — h2https://www.googletagmanager.com/gtag/js?id=G-GRXYWF4WWB&cx=c&_slc=1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-GRXYWF4WWB&cx=c&_slc=1 — 200 — 147.3 KiB — 184 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-GRXYWF4WWB&gtm=45je64k0v9134916630za20g&_p=1776894396276&gcd=13l3l3l2l2l1&npa=0&dma_cps=a&dma=1&_eu=ABAI&are=1&cid=1345354709.1776894396&frm=0&pscdl=noapi&rcb=10&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266401~117512542~118463261&dl=https%3A%2F%2Fnabble.com%2F&dt=Nabble%20%E2%80%A2%20Free%20Forum%20%E2%80%A2%20Embeddable%20Web%20Apps&sid=1776894396&sct=1&seg=0&_tu=wAQ&en=page_view&_fv=1&_ss=1&_ee=1&tfd=1148region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-GRXYWF4WWB&gtm=45je64k0v9134916630za20g&_p=1776894396276&gcd=13l3l3l2l2l1&npa=0&dma_cps=a&dma=1&_eu=ABAI&are=1&cid=1345354709.1776894396&frm=0&pscdl=noapi&rcb=10&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266401~117512542~118463261&dl=https%3A%2F%2Fnabble.com%2F&dt=Nabble%20%E2%80%A2%20Free%20Forum%20%E2%80%A2%20Embeddable%20Web%20Apps&sid=1776894396&sct=1&seg=0&_tu=wAQ&en=page_view&_fv=1&_ss=1&_ee=1&tfd=1148 — 204 — 545 B — 120 ms — h2https://nabble.com/favicon.ico/favicon.ico https://nabble.com/favicon.ico — 404 — 1.5 KiB — 127 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
68% of JavaScript execution is third-party
First-party Third-party 367ms · 168KB · $5/mo
Google Tag Manager
Tag Manager
Optional
Execution 167ms
Transfer 147 KB
Unused 44%
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 142ms
Transfer 0 KB
Monthly Cost $2/mo
Google Analytics
Analytics
Optional
Execution 58ms
Transfer 21 KB
Monthly Cost $1/mo

68% 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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