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https://nerginc.com

Performance

· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
87
GRADE
B
FIX
2
REVIEW
6
PASS
15
INFO
4

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

Mobile Desktop
74
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.
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.

3.76 s

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

4.31 s

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

28 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.

5.43 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.

5.34 s

Page Load Progression

582 ms
1.2 s
1.7 s
2.3 s
2.9 s
3.5 s
4.1 s
4.7 s
Checks
27
15 PASS 6 REVIEW 2 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (338.7 KiB of 338.9 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5814ms total JS execution
FIX
5814ms total JS execution
Warning::
https://www.nerginc.com/assets/vendor-gsap-RFlsMqE...: 4120ms CPU time
Warning::
https://www.nerginc.com/assets/index-BVcRfdGc.js: 578ms CPU time
Warning::
https://www.nerginc.com/assets/vendor-react-MDCyWm...: 487ms CPU time
Warning::
https://www.nerginc.com/: 451ms CPU time
Info::
Unattributable: 178ms CPU time
Warning::
Third-party scripts: 5636ms (97% of total)

Main Thread Breakdown

Other 75% Script Evaluation 14% Style & Layout 8%
ScriptTotalScriptingParse/CompileParty
https://www.nerginc.com/assets/vendor-gsap-RFlsMqEC.js4120ms174ms0ms3rd
https://www.nerginc.com/assets/index-BVcRfdGc.js578ms483ms0ms3rd
https://www.nerginc.com/assets/vendor-react-MDCyWm_F.js487ms140ms1ms3rd
https://www.nerginc.com/451ms3ms1ms3rd
Unattributable178ms8ms0ms1st
B
JS Bundles
5 scripts, 67 KB unused
REVIEW
5 scripts, 67 KB unused
Warning::
https://www.nerginc.com/assets/vendor-react-MDCyWm...: 42 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.nerginc.com/assets/vendor-gsap-RFlsMqE...: 26 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 67 KB
67 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.nerginc.com/assets/vendor-react-MDCyWm_F.js81 KB42 KB (51%)✓3rd
https://www.nerginc.com/assets/vendor-gsap-RFlsMqEC.js45 KB26 KB (57%)✓3rd
https://www.nerginc.com/assets/index-BVcRfdGc.js28 KB—✓3rd
https://www.nerginc.com/assets/rolldown-runtime-CbXtAM7H.js1 KB—✓3rd
https://www.nerginc.com/assets/vendor-lenis-BRKkTgkW.js6 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

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
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.
C
Document Compression
Action
Document response served uncompressed
REVIEW
Document response served uncompressed
Info::
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
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
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, must-revalidate
REVIEW
public, max-age=0, must-revalidate
Info::
Cache-Control header is set
Got: public, max-age=0, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=0, must-revalidate

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
A+
Page Weight Budget
339 KB transferred, 20 requests
PASS
339 KB transferred, 20 requests
Info::
Page weighs 709 KB (339 KB transferred)
Info::
20 HTTP requests
Info::
Estimated 0.07 g CO2 per page load
339 KB / 2.4 MB budget
339 KB transferred
20 requests
0.07 g CO2 per page load
JavaScript 161.3 KiB 48%
Images 75.2 KiB 22%
Fonts 47.3 KiB 14%
Other 40.2 KiB 12%
CSS 10.5 KiB 3%
HTML 2.3 KiB 1%
Other 1.2 KiB 0%
Other 894 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
3 images, 0 KB saveable
PASS
3 images, 0 KB saveable
Warning::
https://www.nerginc.com/arklay-logo.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
3 images 75 KB
0 oversized -0 KB
1 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
1 fonts (47 KB)
PASS
1 fonts (47 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

47 KB total

Render-blocking

0

of 1

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 4.0 s FCP 3.8 s LCP 4.3 shttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2UcC73FwrK3iLTeHuS_nVMrM... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 47.3 KiB — 32 ms — font-display: swap
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 47 KB
Load time 32 ms
Start 493 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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
3
preload
—
dns-prefetch
—
prefetch
—

3 resource hints configured

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, must-revalidate
A+
Server Response Intelligence
1 server-response signal(s) detected
PASS
1 server-response signal(s) detected
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.
A
Page Weight Inventory
20 resources · 339 KB · 67 KB savings available
PASS
20 resources · 339 KB · 67 KB savings available
Info::
Within 1MB page-weight target
Got: 339 KB
Info::
~67 KB of savings available
Warning::
19 third-party resources (100% of weight)
20 resources · 338.9 KiB · 19 third-party Within 1MB page-weight target
JavaScript 48% · 161.3 KiB
Image 34% · 115.2 KiB
Font 14% · 47.3 KiB
CSS 3% · 10.5 KiB
Document 1% · 2.5 KiB
Other 1% · 2.1 KiB

~67.2 KiB of savings available

Remove unused JavaScript: 67.2 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
JavaScript Blocking
1 JS blocking issue(s) detected
PASS
1 JS blocking issue(s) detected
Warning::
Total JS execution time is 5.8 s -- over the 3.5s budget
Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
Asset Compression
No text asset hosts to measure
INFO
No text asset hosts to measure
Info::
No third-party or subdomain host served enough text assets to measure
Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.
Network Waterfall
20 requests over 747ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 3.8 s LCP 4.3 shttps://nerginc.com// https://nerginc.com/ — 308 — 225 B — 63 ms — h2https://www.nerginc.com/www.nerginc.com/ https://www.nerginc.com/ — 200 — 2.3 KiB — 67 ms — h2https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swapfonts.googleapis.com/css2?family=In... https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap — 200 — 1.2 KiB — 84 ms — h2https://www.nerginc.com/assets/index-BVcRfdGc.jswww.nerginc.com/assets/index-BVcRfd... https://www.nerginc.com/assets/index-BVcRfdGc.js — 200 — 27.8 KiB — 203 ms — h2https://www.nerginc.com/assets/rolldown-runtime-CbXtAM7H.jswww.nerginc.com/assets/rolldown-run... https://www.nerginc.com/assets/rolldown-runtime-CbXtAM7H.js — 200 — 846 B — 131 ms — h2https://www.nerginc.com/assets/vendor-react-MDCyWm_F.jswww.nerginc.com/assets/vendor-react... https://www.nerginc.com/assets/vendor-react-MDCyWm_F.js — 200 — 81.5 KiB — 266 ms — h2https://www.nerginc.com/assets/vendor-lenis-BRKkTgkW.jswww.nerginc.com/assets/vendor-lenis... https://www.nerginc.com/assets/vendor-lenis-BRKkTgkW.js — 200 — 6.1 KiB — 183 ms — h2https://www.nerginc.com/assets/vendor-gsap-RFlsMqEC.jswww.nerginc.com/assets/vendor-gsap-... https://www.nerginc.com/assets/vendor-gsap-RFlsMqEC.js — 200 — 45.2 KiB — 238 ms — h2https://www.nerginc.com/assets/index-pVyziH_k.csswww.nerginc.com/assets/index-pVyziH... https://www.nerginc.com/assets/index-pVyziH_k.css — 200 — 9.3 KiB — 155 ms — h2https://www.nerginc.com/manifest.webmanifestwww.nerginc.com/manifest.webmanifes... https://www.nerginc.com/manifest.webmanifest — 200 — 1.2 KiB — 171 ms — h2https://www.nerginc.com/arklay-logo.pngwww.nerginc.com/arklay-logo.png https://www.nerginc.com/arklay-logo.png — 200 — 75.2 KiB — 196 ms — h2data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id…www.w3.org/2000/svg' width='160' he... data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24…www.w3.org/2000/svg' width='12' hei... data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24… — 200 — 0 B — 0 ms — datahttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2fonts.gstatic.com/s/inter/v20/UcC73... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 200 — 47.3 KiB — 32 ms — h3https://www.nerginc.com/api/clientswww.nerginc.com/api/clients https://www.nerginc.com/api/clients — 404 — 370 B — 231 ms — h2https://www.nerginc.com/api/faqswww.nerginc.com/api/faqs https://www.nerginc.com/api/faqs — 404 — 164 B — 245 ms — h2https://www.nerginc.com/api/contactswww.nerginc.com/api/contacts https://www.nerginc.com/api/contacts — 404 — 167 B — 233 ms — h2https://www.nerginc.com/api/settings/publicwww.nerginc.com/api/settings/public https://www.nerginc.com/api/settings/public — 404 — 193 B — 21 ms — h2https://www.nerginc.com/favicon-192.pngwww.nerginc.com/favicon-192.png https://www.nerginc.com/favicon-192.png — 200 — 39.9 KiB — 138 ms — h2https://www.nerginc.com/favicon-192.pngwww.nerginc.com/favicon-192.png https://www.nerginc.com/favicon-192.png — 200 — 46 B — 161 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
97% of JavaScript execution is third-party
First-party Third-party 5636ms · 157KB · $97/mo
www.nerginc.com
Other
Costly
Execution 4120ms
Transfer 45 KB
Unused 57%
Monthly Cost $71/mo
www.nerginc.com
Other
Costly
Execution 578ms
Transfer 28 KB
Monthly Cost $10/mo
www.nerginc.com
Other
Costly
Execution 487ms
Transfer 81 KB
Unused 51%
Monthly Cost $8/mo
www.nerginc.com
Other
Costly
Execution 451ms
Transfer 2 KB
Monthly Cost $8/mo

These scripts may cost more than they're worth

  • www.nerginc.com adds 4120ms and costs ~$71/month
  • www.nerginc.com adds 578ms and costs ~$10/month
  • www.nerginc.com adds 487ms and costs ~$8/month
  • www.nerginc.com adds 451ms and costs ~$8/month

97% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

www.nerginc.com takes 4120ms 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

57% of www.nerginc.com'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

www.nerginc.com takes 578ms 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

www.nerginc.com takes 487ms 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

51% of www.nerginc.com'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

www.nerginc.com takes 451ms 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

Image Optimization
1 images, 75 KB total, 74 KB wasted
INFO

Image Optimization Audit

Total Images

1

Total Size

75 KB

Oversized

1

Wasted

74 KB

1 missing dimensions 1 missing lazy loading
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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