Skip to content
https://www.jcl.energy

Performance

· 24 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
2
REVIEW
7
PASS
11
INFO
4

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

Mobile Desktop
98
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
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.

633 ms

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

1.14 s

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

30 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.

765 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.

1.14 s

Page Load Progression

414 ms
828 ms
1.2 s
1.7 s
2.1 s
2.5 s
2.9 s
3.3 s
Checks
24
11 PASS 7 REVIEW 2 FIX
F
Page Weight Budget
Action
3.8 MB transferred, 75 requests
FIX
3.8 MB transferred, 75 requests
Warning::
Page weighs 6.2 MB (3.8 MB transferred)
Warning::
Images are 2.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.6 MB
Warning::
JavaScript is 1.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.0 MB
Info::
75 HTTP requests
Info::
Estimated 0.80 g CO2 per page load
3.8 MB / 2.4 MB budget
3.8 MB transferred
75 requests
0.80 g CO2 per page load
Images 2.6 MiB 68%
JavaScript 1.0 MiB 26%
Fonts 134.5 KiB 3%
CSS 58.5 KiB 1%
HTML 22.3 KiB 1%
Other 6.6 KiB 0%
Other 4.5 KiB 0%
Other 1.9 KiB 0%
0 2.4 MB 4.9 MB
Over budget

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

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

D
JS Bundles
Action
35 scripts, 347 KB unused
FIX
35 scripts, 347 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-170...: 110 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-E3GZ...: 69 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-170...: 68 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.jcl.energy/_nuxt/CgbXtZQp.js: 46 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://edge.fullstory.com/s/fs.js?org=o-24MHWM-na...: 30 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 347 KB
347 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=AW-17012445944&cx=c&gtm=4e69g1146 KB110 KB (76%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-E3GZP5Q418162 KB69 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-17012445944146 KB68 KB (47%)✓3rd
https://www.jcl.energy/_nuxt/CgbXtZQp.js72 KB46 KB (69%)✓1st
https://edge.fullstory.com/s/fs.js?org=o-24MHWM-na180 KB30 KB (38%)✓3rd
https://www.jcl.energy/_nuxt/B4IKQn3F.js86 KB23 KB (28%)✓1st
https://js.hsadspixel.net/pixels.js5 KB—✓3rd
https://www.jcl.energy/_nuxt/DBvxyBpE.js3 KB—✓1st
https://www.jcl.energy/_nuxt/8gBTCIwE.js2 KB—✓1st
https://www.jcl.energy/_nuxt/CxiGgwzJ.js11 KB—✓1st

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

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

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

B
Image Optimization
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Info::
All images are well-optimized
11 images 2.6 MB
0 oversized -0 KB
11 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
876ms total JS execution
REVIEW
876ms total JS execution
Info::
Unattributable: 192ms CPU time
Info::
https://www.jcl.energy/: 191ms CPU time
Info::
https://edge.fullstory.com/s/fs.js?org=o-24MHWM-na...: 159ms CPU time
Info::
https://js.hs-analytics.net/analytics/178995990000...: 124ms CPU time
Info::
https://www.jcl.energy/_nuxt/C3i5kfut.js: 82ms CPU time
Info::
Third-party scripts: 411ms (47% of total)

Main Thread Breakdown

Script Evaluation 52% Other 26% Style & Layout 11% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
Unattributable192ms45ms0ms1st
https://www.jcl.energy/191ms39ms1ms1st
https://edge.fullstory.com/s/fs.js?org=o-24MHWM-na1159ms118ms10ms3rd
https://js.hs-analytics.net/analytics/1789959900000/24421275.js124ms87ms2ms3rd
https://www.jcl.energy/_nuxt/C3i5kfut.js82ms61ms0ms1st
https://www.googletagmanager.com/gtag/js?id=G-E3GZP5Q41867ms53ms13ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-1701244594462ms47ms14ms3rd
B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
C
Page Weight Inventory
Action
75 resources · 3.8 MB · 347 KB savings available
REVIEW
75 resources · 3.8 MB · 347 KB savings available
Warning::
Page weight 3.8 MB exceeds 1 MB target by 2.8 MB
Got: 3.8 MB Expected: ≤ 1 MB
Info::
~347 KB of savings available
Info::
17 third-party resources (16% of weight)
Info::
6 resources over 200KB
75 resources · 3.8 MiB · 17 third-party 2.8 MiB over 1MB target
Image 68% · 2.6 MiB
JavaScript 26% · 1.0 MiB
Font 3% · 134.5 KiB
CSS 1% · 58.5 KiB
Document 1% · 22.3 KiB
Other 0% · 6.5 KiB

~346.6 KiB of savings available

Remove unused JavaScript: 346.6 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
public, max-age=0, s-maxage=60, must-revalidate
REVIEW
public, max-age=0, s-maxage=60, must-revalidate
Info::
Cache-Control header is set
Got: public, max-age=0, s-maxage=60, must-revalidate
Info::
CDN TTL: 1 minute (s-maxage=60)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=0, s-maxage=60, must-revalidate

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
s-maxage60CDN caches for 1 minute
must-revalidate—Must recheck with server after expiry
A+
Third-Party Impact
16% third-party, 0 ms blocking
PASS
16% third-party, 0 ms blocking
Info::
Third-party code accounts for 16% of page weight (639.3 KiB of 3.8 MiB)
Info::
Third-party blocking time is low (0 ms)
84%
16%
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
5 fonts (134 KB)
PASS
5 fonts (134 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

134 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 633 ms LCP 1.1 shttps://www.jcl.energy/fonts/rajdhani-700.woff2rajdhani-700.woff2 https://www.jcl.energy/fonts/rajdhani-700.woff2 — 10.3 KiB — 36 ms — font-display: swaphttps://www.jcl.energy/fonts/rajdhani-600.woff2rajdhani-600.woff2 https://www.jcl.energy/fonts/rajdhani-600.woff2 — 10.4 KiB — 39 ms — font-display: swaphttps://www.jcl.energy/fonts/roboto-400.woff2roboto-400.woff2 https://www.jcl.energy/fonts/roboto-400.woff2 — 37.9 KiB — 62 ms — font-display: swaphttps://www.jcl.energy/fonts/roboto-700.woff2roboto-700.woff2 https://www.jcl.energy/fonts/roboto-700.woff2 — 37.9 KiB — 50 ms — font-display: swaphttps://www.jcl.energy/fonts/roboto-600.woff2roboto-600.woff2 https://www.jcl.energy/fonts/roboto-600.woff2 — 37.9 KiB — 48 ms — font-display: swap
rajdhani-700.woff2 woff2 swap
Size 10 KB
Load time 36 ms
Start 97 ms
Risk FOUT — text flashes from fallback to web font
rajdhani-600.woff2 woff2 swap
Size 10 KB
Load time 39 ms
Start 97 ms
Risk FOUT — text flashes from fallback to web font
roboto-400.woff2 woff2 swap
Size 38 KB
Load time 62 ms
Start 98 ms
Risk FOUT — text flashes from fallback to web font
roboto-700.woff2 woff2 swap
Size 38 KB
Load time 50 ms
Start 227 ms
Risk FOUT — text flashes from fallback to web font
roboto-600.woff2 woff2 swap
Size 38 KB
Load time 48 ms
Start 228 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)
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+
Document Compression
Document response uses brotli
PASS
Document response uses brotli
Info::
Main HTML response uses brotli (Content-Encoding: br)
Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.
A+
Asset Compression
All 1 asset host use brotli
PASS
All 1 asset host use brotli
Info::
www.googletagmanager.com serves assets with brotli (assets: 3)
Got: www.googletagmanager.com (application/javascript)
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Main HTML Cache-Control
Main HTML max-age=0 (≤ 5min) is appropriate
PASS
Main HTML max-age=0 (≤ 5min) is appropriate
Info::
Main HTML max-age=0 (≤ 5min) is appropriate
Got: public, max-age=0, s-maxage=60, must-revalidate
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: Accept-Encoding
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
Network Waterfall
75 requests over 997ms
INFO
0 ms 500 ms 1.0 s FCP 633 ms LCP 1.1 shttps://www.jcl.energy// https://www.jcl.energy/ — 200 — 22.3 KiB — 86 ms — h2https://www.jcl.energy/_nuxt/entry.BxcX56ZW.css/_nuxt/entry.BxcX56ZW.css https://www.jcl.energy/_nuxt/entry.BxcX56ZW.css — 200 — 14.2 KiB — 45 ms — h2https://www.jcl.energy/_nuxt/HighlightCards.BaYHsL7Q.css/_nuxt/HighlightCards.BaYHsL7Q.css https://www.jcl.energy/_nuxt/HighlightCards.BaYHsL7Q.css — 200 — 1.8 KiB — 35 ms — h2https://www.jcl.energy/_nuxt/useForm.ng3YSTH4.css/_nuxt/useForm.ng3YSTH4.css https://www.jcl.energy/_nuxt/useForm.ng3YSTH4.css — 200 — 1.4 KiB — 44 ms — h2https://www.jcl.energy/fonts/rajdhani-700.woff2/fonts/rajdhani-700.woff2 https://www.jcl.energy/fonts/rajdhani-700.woff2 — 200 — 10.3 KiB — 36 ms — h2https://www.jcl.energy/fonts/rajdhani-600.woff2/fonts/rajdhani-600.woff2 https://www.jcl.energy/fonts/rajdhani-600.woff2 — 200 — 10.4 KiB — 39 ms — h2https://www.jcl.energy/fonts/roboto-400.woff2/fonts/roboto-400.woff2 https://www.jcl.energy/fonts/roboto-400.woff2 — 200 — 37.9 KiB — 62 ms — h2https://www.jcl.energy/_nuxt/B4IKQn3F.js/_nuxt/B4IKQn3F.js https://www.jcl.energy/_nuxt/B4IKQn3F.js — 200 — 85.7 KiB — 84 ms — h2https://www.jcl.energy/_nuxt/C3i5kfut.js/_nuxt/C3i5kfut.js https://www.jcl.energy/_nuxt/C3i5kfut.js — 200 — 12.4 KiB — 112 ms — h2https://www.jcl.energy/_nuxt/DBvxyBpE.js/_nuxt/DBvxyBpE.js https://www.jcl.energy/_nuxt/DBvxyBpE.js — 200 — 3.5 KiB — 119 ms — h2https://www.jcl.energy/_nuxt/D83puLab.js/_nuxt/D83puLab.js https://www.jcl.energy/_nuxt/D83puLab.js — 200 — 1.4 KiB — 117 ms — h2https://www.jcl.energy/_nuxt/l3J7YCW8.js/_nuxt/l3J7YCW8.js https://www.jcl.energy/_nuxt/l3J7YCW8.js — 200 — 132.9 KiB — 148 ms — h2https://www.jcl.energy/_nuxt/DcNgiFxv.js/_nuxt/DcNgiFxv.js https://www.jcl.energy/_nuxt/DcNgiFxv.js — 200 — 1.6 KiB — 120 ms — h2https://www.jcl.energy/_nuxt/BKRkGmbI.js/_nuxt/BKRkGmbI.js https://www.jcl.energy/_nuxt/BKRkGmbI.js — 200 — 3.8 KiB — 105 ms — h2https://www.jcl.energy/_nuxt/DVtuQ5U8.js/_nuxt/DVtuQ5U8.js https://www.jcl.energy/_nuxt/DVtuQ5U8.js — 200 — 1.6 KiB — 123 ms — h2https://www.jcl.energy/_nuxt/8gBTCIwE.js/_nuxt/8gBTCIwE.js https://www.jcl.energy/_nuxt/8gBTCIwE.js — 200 — 2.2 KiB — 125 ms — h2https://www.jcl.energy/_nuxt/CxiGgwzJ.js/_nuxt/CxiGgwzJ.js https://www.jcl.energy/_nuxt/CxiGgwzJ.js — 200 — 10.7 KiB — 132 ms — h2https://www.jcl.energy/_nuxt/S_IEa1nC.js/_nuxt/S_IEa1nC.js https://www.jcl.energy/_nuxt/S_IEa1nC.js — 200 — 3.7 KiB — 133 ms — h2https://www.jcl.energy/_nuxt/BrnpY0SR.js/_nuxt/BrnpY0SR.js https://www.jcl.energy/_nuxt/BrnpY0SR.js — 200 — 4.1 KiB — 134 ms — h2https://www.jcl.energy/_nuxt/BCFFW011.js/_nuxt/BCFFW011.js https://www.jcl.energy/_nuxt/BCFFW011.js — 200 — 2.1 KiB — 151 ms — h2https://www.jcl.energy/img/logos/jcl-logo-white.png/img/logos/jcl-logo-white.png https://www.jcl.energy/img/logos/jcl-logo-white.png — 200 — 9.5 KiB — 147 ms — h2https://www.jcl.energy/img/logos/jcl-logo.png/img/logos/jcl-logo.png https://www.jcl.energy/img/logos/jcl-logo.png — 200 — 9.7 KiB — 148 ms — h2https://www.jcl.energy/media/img/photos/tech-rigging-radiators.jpg/media/img/photos/tech-rigging-radi... https://www.jcl.energy/media/img/photos/tech-rigging-radiators.jpg — 200 — 423.7 KiB — 154 ms — h2https://www.jcl.energy/img/logos/jcl-bolt.png/img/logos/jcl-bolt.png https://www.jcl.energy/img/logos/jcl-bolt.png — 200 — 10.5 KiB — 143 ms — h2https://www.jcl.energy/media/img/comp-assets/grain.png/media/img/comp-assets/grain.png https://www.jcl.energy/media/img/comp-assets/grain.png — 200 — 95.8 KiB — 87 ms — h2https://www.jcl.energy/media/img/photos/sunrise-team.jpg/media/img/photos/sunrise-team.jpg https://www.jcl.energy/media/img/photos/sunrise-team.jpg — 200 — 368.1 KiB — 93 ms — h2https://www.jcl.energy/media/img/photos/booth-discovery.jpg/media/img/photos/booth-discovery.j... https://www.jcl.energy/media/img/photos/booth-discovery.jpg — 200 — 368.0 KiB — 58 ms — h2https://www.jcl.energy/media/img/photos/gauge-liquid-temp.jpg/media/img/photos/gauge-liquid-temp... https://www.jcl.energy/media/img/photos/gauge-liquid-temp.jpg — 200 — 271.5 KiB — 65 ms — h2https://www.jcl.energy/media/img/photos/substation-crane-lift.jpg/media/img/photos/substation-crane-... https://www.jcl.energy/media/img/photos/substation-crane-lift.jpg — 200 — 460.6 KiB — 97 ms — h2https://www.jcl.energy/media/img/photos/oil-hose-connection.jpg/media/img/photos/oil-hose-connecti... https://www.jcl.energy/media/img/photos/oil-hose-connection.jpg — 200 — 641.5 KiB — 102 ms — h2
0 ms 500 ms 1.0 s FCP 633 ms LCP 1.1 shttps://www.jcl.energy// https://www.jcl.energy/ — 200 — 22.3 KiB — 86 ms — h2https://www.jcl.energy/_nuxt/entry.BxcX56ZW.css/_nuxt/entry.BxcX56ZW.css https://www.jcl.energy/_nuxt/entry.BxcX56ZW.css — 200 — 14.2 KiB — 45 ms — h2https://www.jcl.energy/_nuxt/HighlightCards.BaYHsL7Q.css/_nuxt/HighlightCards.BaYHsL7Q.css https://www.jcl.energy/_nuxt/HighlightCards.BaYHsL7Q.css — 200 — 1.8 KiB — 35 ms — h2https://www.jcl.energy/_nuxt/useForm.ng3YSTH4.css/_nuxt/useForm.ng3YSTH4.css https://www.jcl.energy/_nuxt/useForm.ng3YSTH4.css — 200 — 1.4 KiB — 44 ms — h2https://www.jcl.energy/fonts/rajdhani-700.woff2/fonts/rajdhani-700.woff2 https://www.jcl.energy/fonts/rajdhani-700.woff2 — 200 — 10.3 KiB — 36 ms — h2https://www.jcl.energy/fonts/rajdhani-600.woff2/fonts/rajdhani-600.woff2 https://www.jcl.energy/fonts/rajdhani-600.woff2 — 200 — 10.4 KiB — 39 ms — h2https://www.jcl.energy/fonts/roboto-400.woff2/fonts/roboto-400.woff2 https://www.jcl.energy/fonts/roboto-400.woff2 — 200 — 37.9 KiB — 62 ms — h2https://www.jcl.energy/_nuxt/B4IKQn3F.js/_nuxt/B4IKQn3F.js https://www.jcl.energy/_nuxt/B4IKQn3F.js — 200 — 85.7 KiB — 84 ms — h2https://www.jcl.energy/_nuxt/C3i5kfut.js/_nuxt/C3i5kfut.js https://www.jcl.energy/_nuxt/C3i5kfut.js — 200 — 12.4 KiB — 112 ms — h2https://www.jcl.energy/_nuxt/DBvxyBpE.js/_nuxt/DBvxyBpE.js https://www.jcl.energy/_nuxt/DBvxyBpE.js — 200 — 3.5 KiB — 119 ms — h2https://www.jcl.energy/_nuxt/D83puLab.js/_nuxt/D83puLab.js https://www.jcl.energy/_nuxt/D83puLab.js — 200 — 1.4 KiB — 117 ms — h2https://www.jcl.energy/_nuxt/l3J7YCW8.js/_nuxt/l3J7YCW8.js https://www.jcl.energy/_nuxt/l3J7YCW8.js — 200 — 132.9 KiB — 148 ms — h2https://www.jcl.energy/_nuxt/DcNgiFxv.js/_nuxt/DcNgiFxv.js https://www.jcl.energy/_nuxt/DcNgiFxv.js — 200 — 1.6 KiB — 120 ms — h2https://www.jcl.energy/_nuxt/BKRkGmbI.js/_nuxt/BKRkGmbI.js https://www.jcl.energy/_nuxt/BKRkGmbI.js — 200 — 3.8 KiB — 105 ms — h2https://www.jcl.energy/_nuxt/DVtuQ5U8.js/_nuxt/DVtuQ5U8.js https://www.jcl.energy/_nuxt/DVtuQ5U8.js — 200 — 1.6 KiB — 123 ms — h2https://www.jcl.energy/_nuxt/8gBTCIwE.js/_nuxt/8gBTCIwE.js https://www.jcl.energy/_nuxt/8gBTCIwE.js — 200 — 2.2 KiB — 125 ms — h2https://www.jcl.energy/_nuxt/CxiGgwzJ.js/_nuxt/CxiGgwzJ.js https://www.jcl.energy/_nuxt/CxiGgwzJ.js — 200 — 10.7 KiB — 132 ms — h2https://www.jcl.energy/_nuxt/S_IEa1nC.js/_nuxt/S_IEa1nC.js https://www.jcl.energy/_nuxt/S_IEa1nC.js — 200 — 3.7 KiB — 133 ms — h2https://www.jcl.energy/_nuxt/BrnpY0SR.js/_nuxt/BrnpY0SR.js https://www.jcl.energy/_nuxt/BrnpY0SR.js — 200 — 4.1 KiB — 134 ms — h2https://www.jcl.energy/_nuxt/BCFFW011.js/_nuxt/BCFFW011.js https://www.jcl.energy/_nuxt/BCFFW011.js — 200 — 2.1 KiB — 151 ms — h2https://www.jcl.energy/img/logos/jcl-logo-white.png/img/logos/jcl-logo-white.png https://www.jcl.energy/img/logos/jcl-logo-white.png — 200 — 9.5 KiB — 147 ms — h2https://www.jcl.energy/img/logos/jcl-logo.png/img/logos/jcl-logo.png https://www.jcl.energy/img/logos/jcl-logo.png — 200 — 9.7 KiB — 148 ms — h2https://www.jcl.energy/media/img/photos/tech-rigging-radiators.jpg/media/img/photos/tech-rigging-radi... https://www.jcl.energy/media/img/photos/tech-rigging-radiators.jpg — 200 — 423.7 KiB — 154 ms — h2https://www.jcl.energy/img/logos/jcl-bolt.png/img/logos/jcl-bolt.png https://www.jcl.energy/img/logos/jcl-bolt.png — 200 — 10.5 KiB — 143 ms — h2https://www.jcl.energy/media/img/comp-assets/grain.png/media/img/comp-assets/grain.png https://www.jcl.energy/media/img/comp-assets/grain.png — 200 — 95.8 KiB — 87 ms — h2https://www.jcl.energy/media/img/photos/sunrise-team.jpg/media/img/photos/sunrise-team.jpg https://www.jcl.energy/media/img/photos/sunrise-team.jpg — 200 — 368.1 KiB — 93 ms — h2https://www.jcl.energy/media/img/photos/booth-discovery.jpg/media/img/photos/booth-discovery.j... https://www.jcl.energy/media/img/photos/booth-discovery.jpg — 200 — 368.0 KiB — 58 ms — h2https://www.jcl.energy/media/img/photos/gauge-liquid-temp.jpg/media/img/photos/gauge-liquid-temp... https://www.jcl.energy/media/img/photos/gauge-liquid-temp.jpg — 200 — 271.5 KiB — 65 ms — h2https://www.jcl.energy/media/img/photos/substation-crane-lift.jpg/media/img/photos/substation-crane-... https://www.jcl.energy/media/img/photos/substation-crane-lift.jpg — 200 — 460.6 KiB — 97 ms — h2https://www.jcl.energy/media/img/photos/oil-hose-connection.jpg/media/img/photos/oil-hose-connecti... https://www.jcl.energy/media/img/photos/oil-hose-connection.jpg — 200 — 641.5 KiB — 102 ms — h2https://www.jcl.energy/fonts/roboto-700.woff2/fonts/roboto-700.woff2 https://www.jcl.energy/fonts/roboto-700.woff2 — 200 — 37.9 KiB — 50 ms — h2https://www.jcl.energy/fonts/roboto-600.woff2/fonts/roboto-600.woff2 https://www.jcl.energy/fonts/roboto-600.woff2 — 200 — 37.9 KiB — 48 ms — h2https://www.jcl.energy/_nuxt/index.BLW85-S0.css/_nuxt/index.BLW85-S0.css https://www.jcl.energy/_nuxt/index.BLW85-S0.css — 200 — 3.7 KiB — 30 ms — h2https://js.hs-scripts.com/24421275.jsjs.hs-scripts.com/24421275.js https://js.hs-scripts.com/24421275.js — 200 — 1.3 KiB — 78 ms — h2https://www.googletagmanager.com/gtag/js?id=G-E3GZP5Q418www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-E3GZP5Q418 — 200 — 161.5 KiB — 158 ms — h2https://edge.fullstory.com/s/fs.js?org=o-24MHWM-na1edge.fullstory.com/s/fs.js?org=o-24... https://edge.fullstory.com/s/fs.js?org=o-24MHWM-na1 — 200 — 80.2 KiB — 102 ms — h2https://www.jcl.energy/_nuxt/default.DaNcvp5K.css/_nuxt/default.DaNcvp5K.css https://www.jcl.energy/_nuxt/default.DaNcvp5K.css — 200 — 3.8 KiB — 29 ms — h2https://js.hsadspixel.net/pixels.jsjs.hsadspixel.net/pixels.js https://js.hsadspixel.net/pixels.js — 200 — 5.3 KiB — 70 ms — h2https://js.hscollectedforms.net/collectedforms.jsjs.hscollectedforms.net/collectedfo... https://js.hscollectedforms.net/collectedforms.js — 200 — 27.1 KiB — 77 ms — h2https://js.hs-banner.com/v2/24421275/banner.jsjs.hs-banner.com/v2/24421275/banner... https://js.hs-banner.com/v2/24421275/banner.js — 200 — 23.9 KiB — 77 ms — h2https://js.hs-analytics.net/analytics/1789959900000/24421275.jsjs.hs-analytics.net/analytics/17899... https://js.hs-analytics.net/analytics/1789959900000/24421275.js — 200 — 42.5 KiB — 77 ms — h2https://edge.fullstory.com/s/settings/o-24MHWM-na1/v1/webedge.fullstory.com/s/settings/o-24M... https://edge.fullstory.com/s/settings/o-24MHWM-na1/v1/web — 200 — 1.9 KiB — 21 ms — h2https://www.google-analytics.com/g/collect?v=2&tid=G-E3GZP5Q418&gtm=45je69g1v868364516za200zd868364516xf1&_p=1789959989664&gcs=G101&gcd=13p3t3l3l5l1&npa=0&dma=0&cid=898271960.1789959990&frm=0&pscdl=denied&rcb=18&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B153.0.8010.47%7CNot_A%2520Brand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=115938466~115938469~118897920~118897930~120213116~120385423~120412526~120469145~120469153&dp=%2F&sid=1789959989&sct=1&seg=0&dl=https%3A%2F%2Fwww.jcl.energy%2F&dt=Transformer%20Sales%2C%20Rentals%20%26%20Service%20%7C%20JCL%20Energy&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&ep.anonymize_ip=true&tfd=549www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-E3GZP5Q418&gtm=45je69g1v868364516za200zd868364516xf1&_p=1789959989664&gcs=G101&gcd=13p3t3l3l5l1&npa=0&dma=0&cid=898271960.1789959990&frm=0&pscdl=denied&rcb=18&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B153.0.8010.47%7CNot_A%2520Brand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=115938466~115938469~118897920~118897930~120213116~120385423~120412526~120469145~120469153&dp=%2F&sid=1789959989&sct=1&seg=0&dl=https%3A%2F%2Fwww.jcl.energy%2F&dt=Transformer%20Sales%2C%20Rentals%20%26%20Service%20%7C%20JCL%20Energy&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&ep.anonymize_ip=true&tfd=549 — 204 — 549 B — 117 ms — h2https://rs.fullstory.com/rec/pagers.fullstory.com/rec/page https://rs.fullstory.com/rec/page — 200 — 882 B — 192 ms — h2https://api.hubapi.com/hs-script-loader-public/v2/config/pixels-and-events/json?portalId=24421275api.hubapi.com/hs-script-loader-pub... https://api.hubapi.com/hs-script-loader-public/v2/config/pixels-and-events/json?portalId=24421275 — 200 — 1.1 KiB — 158 ms — h2https://forms.hscollectedforms.net/collected-forms/v1/config/json?portalId=24421275&utk=forms.hscollectedforms.net/collecte... https://forms.hscollectedforms.net/collected-forms/v1/config/json?portalId=24421275&utk= — 200 — 708 B — 122 ms — h2https://track.hubspot.com/__ptq.gif?k=1&sd=800x600&cd=24-bit&cs=UTF-8&ln=en-us&v=1.1&a=24421275&rcu=https%3A%2F%2Fwww.jcl.energy%2F&pu=https%3A%2F%2Fwww.jcl.energy%2F&t=Transformer+Sales%2C+Rentals+%26+Service+%7C+JCL+Energy&cts=1789959989948&vi=29d315286a035981e5666ba3bd7bcd55&nc=true&u=108086301.29d315286a035981e5666ba3bd7bcd55.1789959989944.1789959989944.1789959989944.1&b=108086301.1.1789959989945&cc=15track.hubspot.com/__ptq.gif?k=1&sd=... https://track.hubspot.com/__ptq.gif?k=1&sd=800x600&cd=24-bit&cs=UTF-8&ln=en-us&v=1.1&a=24421275&rcu=https%3A%2F%2Fwww.jcl.energy%2F&pu=https%3A%2F%2Fwww.jcl.energy%2F&t=Transformer+Sales%2C+Rentals+%26+Service+%7C+JCL+Energy&cts=1789959989948&vi=29d315286a035981e5666ba3bd7bcd55&nc=true&u=108086301.29d315286a035981e5666ba3bd7bcd55.1789959989944.1789959989944.1789959989944.1&b=108086301.1.1789959989945&cc=15 — 200 — 973 B — 160 ms — h2https://www.jcl.energy/favicon.ico?v=2/favicon.ico?v=2 https://www.jcl.energy/favicon.ico?v=2 — 200 — 6.6 KiB — 288 ms — h2https://www.googletagmanager.com/gtag/js?id=AW-17012445944www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=AW-17012445944 — 200 — 145.7 KiB — 64 ms — h2https://www.googletagmanager.com/gtag/js?id=AW-17012445944&cx=c&gtm=4e69g1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=AW-17012445944&cx=c&gtm=4e69g1 — 200 — 145.7 KiB — 150 ms — h2https://www.jcl.energy/_nuxt/Qjr80XDc.js/_nuxt/Qjr80XDc.js https://www.jcl.energy/_nuxt/Qjr80XDc.js — 200 — 4.6 KiB — 40 ms — h2https://www.jcl.energy/_nuxt/Bntrx5Sz.js/_nuxt/Bntrx5Sz.js https://www.jcl.energy/_nuxt/Bntrx5Sz.js — 200 — 2.4 KiB — 43 ms — h2https://www.jcl.energy/_nuxt/CtaBand.DMGuwzPD.css/_nuxt/CtaBand.DMGuwzPD.css https://www.jcl.energy/_nuxt/CtaBand.DMGuwzPD.css — 200 — 1.4 KiB — 30 ms — h2https://www.jcl.energy/_nuxt/index.DYc-6c1b.css/_nuxt/index.DYc-6c1b.css https://www.jcl.energy/_nuxt/index.DYc-6c1b.css — 200 — 2.6 KiB — 33 ms — h2https://www.jcl.energy/_nuxt/D4B2LFWD.js/_nuxt/D4B2LFWD.js https://www.jcl.energy/_nuxt/D4B2LFWD.js — 200 — 9.7 KiB — 40 ms — h2https://www.jcl.energy/_nuxt/field-service.DJFVPPPI.css/_nuxt/field-service.DJFVPPPI.css https://www.jcl.energy/_nuxt/field-service.DJFVPPPI.css — 200 — 3.9 KiB — 36 ms — h2https://www.jcl.energy/_nuxt/Ddd_lOT-.js/_nuxt/Ddd_lOT-.js https://www.jcl.energy/_nuxt/Ddd_lOT-.js — 200 — 7.2 KiB — 46 ms — h2https://www.jcl.energy/_nuxt/index.CqVYkwES.css/_nuxt/index.CqVYkwES.css https://www.jcl.energy/_nuxt/index.CqVYkwES.css — 200 — 3.4 KiB — 42 ms — h2https://www.jcl.energy/_nuxt/eJs5H1dP.js/_nuxt/eJs5H1dP.js https://www.jcl.energy/_nuxt/eJs5H1dP.js — 200 — 6.9 KiB — 51 ms — h2https://www.jcl.energy/_nuxt/index.BOgVH6DH.css/_nuxt/index.BOgVH6DH.css https://www.jcl.energy/_nuxt/index.BOgVH6DH.css — 200 — 2.2 KiB — 43 ms — h2https://www.jcl.energy/_nuxt/CkB94eNP.js/_nuxt/CkB94eNP.js https://www.jcl.energy/_nuxt/CkB94eNP.js — 200 — 5.3 KiB — 46 ms — h2https://www.jcl.energy/_nuxt/our-story.Dd493as4.css/_nuxt/our-story.Dd493as4.css https://www.jcl.energy/_nuxt/our-story.Dd493as4.css — 200 — 2.9 KiB — 44 ms — h2https://www.jcl.energy/_nuxt/builds/meta/f626a950-e115-4a01-8644-4eaa0bf5e0fd.json/_nuxt/builds/meta/f626a950-e115-4a... https://www.jcl.energy/_nuxt/builds/meta/f626a950-e115-4a01-8644-4eaa0bf5e0fd.json — 200 — 1.4 KiB — 50 ms — h2https://www.jcl.energy/_nuxt/wd7ixEDT.js/_nuxt/wd7ixEDT.js https://www.jcl.energy/_nuxt/wd7ixEDT.js — 200 — 5.5 KiB — 37 ms — h2https://www.jcl.energy/_nuxt/index.CbOOjV6c.css/_nuxt/index.CbOOjV6c.css https://www.jcl.energy/_nuxt/index.CbOOjV6c.css — 200 — 2.0 KiB — 34 ms — h2https://www.jcl.energy/_nuxt/CLmx7Oqj.js/_nuxt/CLmx7Oqj.js https://www.jcl.energy/_nuxt/CLmx7Oqj.js — 200 — 14.4 KiB — 38 ms — h2https://www.jcl.energy/_nuxt/B90RfhVc.js/_nuxt/B90RfhVc.js https://www.jcl.energy/_nuxt/B90RfhVc.js — 200 — 2.0 KiB — 45 ms — h2https://www.jcl.energy/_nuxt/request.CjgOzOph.css/_nuxt/request.CjgOzOph.css https://www.jcl.energy/_nuxt/request.CjgOzOph.css — 200 — 2.9 KiB — 31 ms — h2https://www.jcl.energy/_nuxt/BV7S2oJO.js/_nuxt/BV7S2oJO.js https://www.jcl.energy/_nuxt/BV7S2oJO.js — 200 — 2.2 KiB — 40 ms — h2https://www.jcl.energy/_nuxt/CgbXtZQp.js/_nuxt/CgbXtZQp.js https://www.jcl.energy/_nuxt/CgbXtZQp.js — 200 — 72.1 KiB — 53 ms — h2https://www.jcl.energy/_nuxt/B222QPSX.js/_nuxt/B222QPSX.js https://www.jcl.energy/_nuxt/B222QPSX.js — 200 — 4.9 KiB — 43 ms — h2https://www.jcl.energy/_nuxt/useContentPage.BG0PubV0.css/_nuxt/useContentPage.BG0PubV0.css https://www.jcl.energy/_nuxt/useContentPage.BG0PubV0.css — 200 — 12.3 KiB — 46 ms — h2https://www.jcl.energy/_nuxt/DhPDg7pB.js/_nuxt/DhPDg7pB.js https://www.jcl.energy/_nuxt/DhPDg7pB.js — 200 — 2.0 KiB — 45 ms — h2https://pagead2.googlesyndication.com/ccm/collect?rcb=8&frm=0&apvc=1&tid=AW-17012445944&en=page_view&dl=https%3A%2F%2Fwww.jcl.energy%2F&scrsrc=www.googletagmanager.com&rnd=968701891.1789959990&navt=n&npa=0&did=dZTQ1Zm&gdid=dZTQ1Zm&gtm=45be69g1za200zb868364516zd868364516xecxf1&gcs=G101&gcd=13p3t3l3l5l1&dma=0&tag_exp=115616986~115938466~115938469~118012009~118897920~118897930~120385423~120469145~120469153&tft=1789959990302&tfd=945&tids=AW-17012445944&fmt=8pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=8&frm=0&apvc=1&tid=AW-17012445944&en=page_view&dl=https%3A%2F%2Fwww.jcl.energy%2F&scrsrc=www.googletagmanager.com&rnd=968701891.1789959990&navt=n&npa=0&did=dZTQ1Zm&gdid=dZTQ1Zm&gtm=45be69g1za200zb868364516zd868364516xecxf1&gcs=G101&gcd=13p3t3l3l5l1&dma=0&tag_exp=115616986~115938466~115938469~118012009~118897920~118897930~120385423~120469145~120469153&tft=1789959990302&tfd=945&tids=AW-17012445944&fmt=8 — 200 — 21 B — 50 ms — h3https://rs.fullstory.com/rec/bundle/v2?OrgId=o-24MHWM-na1&UserId=79f8486c-3d1d-4cbc-8e83-f4c2e44eb157&SessionId=9fe57e1f-41d3-4565-882f-92c292cd12a6&PageId=fc3fb406-7c07-4e85-8c8e-f9a3cfb23d57&Seq=1&ClientTime=1789959992681&CompiledVersion=e36f88bd06042e4e26bb8d1110bd39aa7f63edde&PageStart=1789959990112&PrevBundleTime=0&LastActivity=2316&IsNewSession=true&ContentEncoding=gziprs.fullstory.com/rec/bundle/v2?OrgI... https://rs.fullstory.com/rec/bundle/v2?OrgId=o-24MHWM-na1&UserId=79f8486c-3d1d-4cbc-8e83-f4c2e44eb157&SessionId=9fe57e1f-41d3-4565-882f-92c292cd12a6&PageId=fc3fb406-7c07-4e85-8c8e-f9a3cfb23d57&Seq=1&ClientTime=1789959992681&CompiledVersion=e36f88bd06042e4e26bb8d1110bd39aa7f63edde&PageStart=1789959990112&PrevBundleTime=0&LastActivity=2316&IsNewSession=true&ContentEncoding=gzip — -1 — 0 B — 0 ms —
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
47% of JavaScript execution is third-party
First-party Third-party 411ms · 430KB · €4/mo
edge.fullstory.com
Other
Optional
Execution 159ms
Transfer 80 KB
Unused 38%
Monthly Cost €2/mo
HubSpot Analytics
Analytics
Optional
Execution 124ms
Transfer 43 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 67ms
Transfer 162 KB
Unused 43%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 62ms
Transfer 146 KB
Unused 47%
Monthly Cost €1/mo

47% 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

Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-08-23 — 2026-09-19)

LCP (p75)

2602 ms

72% good

INP (p75)

0 ms

0% good

CLS (p75)

0.000

100% good

FCP (p75)

1607 ms

TTFB (p75)

0 ms

Image Optimization
15 images, 501 KB total, 363 KB wasted
INFO

Image Optimization Audit

Total Images

15

Total Size

501 KB

Oversized

3

Wasted

363 KB

4 missing dimensions 7 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback