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Performance

· 21 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
92
GRADE
A
FIX
1
REVIEW
6
PASS
12
INFO
2

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

Mobile Desktop
94
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
91
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.

1.18 s

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

1.18 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.

0.000

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

1.22 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.

1.18 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
21
12 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.

B
Third-Party Impact
47% third-party, 0 ms blocking
REVIEW
47% third-party, 0 ms blocking
Info::
Third-party code accounts for 47% of page weight (177.6 KiB of 376.6 KiB)
Info::
Third-party blocking time is low (0 ms)
53%
47%
First-party Third-party
B
JS Bundles
11 scripts, 52 KB unused
REVIEW
11 scripts, 52 KB unused
Warning::
https://toolswitch.dev/_next/static/chunks/0jscyji...: 27 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://toolswitch.dev/_next/static/chunks/286ftav...: 25 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 52 KB
52 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://toolswitch.dev/_next/static/chunks/0jscyjiudjg-y.js70 KB27 KB (39%)✓1st
https://toolswitch.dev/_next/static/chunks/286ftavv25fm3.js45 KB25 KB (56%)✓1st
https://toolswitch.dev/_next/static/chunks/1m3h2hnjxg8a0.js2 KB—✓1st
https://www.googletagmanager.com/gtag/js?id=G-SXFC45CFLP178 KB—✓3rd
https://toolswitch.dev/_next/static/chunks/3fhvh40j_3uoe.js8 KB—✓1st
https://toolswitch.dev/_next/static/chunks/turbopack-2c3mg3r-05n1w.js4 KB—✓1st
https://toolswitch.dev/_next/static/chunks/0hd3vn9vslnhb.js3 KB—✓1st
https://toolswitch.dev/_next/static/chunks/14uv7bafx4dsp.js0 KB—✓1st
https://toolswitch.dev/_next/static/chunks/0wsu0v0jk8ep3.js14 KB—✓1st
https://toolswitch.dev/_next/static/chunks/1vosv2eoljs8f.js12 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

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
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
No Cache-Control header on main HTML response
Info::
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
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

A+
Page Weight Budget
377 KB transferred, 15 requests
PASS
377 KB transferred, 15 requests
Info::
Page weighs 1.2 MB (377 KB transferred)
Info::
15 HTTP requests
Info::
Estimated 0.08 g CO2 per page load
377 KB / 2.4 MB budget
377 KB transferred
15 requests
0.08 g CO2 per page load
JavaScript 339.0 KiB 90%
HTML 23.5 KiB 6%
CSS 13.4 KiB 4%
Other 861 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
No images on this page
PASS
No images on this page
Info::
No images on this page
0 images 0 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
117ms total JS execution
PASS
117ms total JS execution
Info::
https://toolswitch.dev/_next/static/chunks/0jscyji...: 66ms CPU time
Info::
https://toolswitch.dev/en: 51ms CPU time

Main Thread Breakdown

Script Evaluation 43% Other 22% Style & Layout 20% Script Parsing & Compilation 9% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://toolswitch.dev/_next/static/chunks/0jscyjiudjg-y.js66ms61ms4ms1st
https://toolswitch.dev/en51ms3ms3ms1st
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+
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
PASS
HTTP/3 advertised via Alt-Svc
Info::
HTTP/3 (QUIC) is supported
First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.
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+
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
15 resources · 377 KB · 52 KB savings available
PASS
15 resources · 377 KB · 52 KB savings available
Info::
Within 1MB page-weight target
Got: 377 KB
Info::
~52 KB of savings available
Warning::
1 third-party resources (47% of weight)
15 resources · 376.6 KiB · 1 third-party Within 1MB page-weight target
JavaScript 90% · 339.0 KiB
Document 6% · 23.5 KiB
CSS 4% · 13.4 KiB
Image 0% · 761 B
Other 0% · 100 B

~52.4 KiB of savings available

Remove unused JavaScript: 52.4 KiB
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
15 requests over 1629ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 1.2 s LCP 1.2 shttps://toolswitch.dev// https://toolswitch.dev/ — 307 — 100 B — 493 ms — h2https://toolswitch.dev/en/en https://toolswitch.dev/en — 200 — 23.5 KiB — 377 ms — h2https://toolswitch.dev/_next/static/chunks/0lkls0a-pa_lf.css/_next/static/chunks/0lkls0a-pa_lf.... https://toolswitch.dev/_next/static/chunks/0lkls0a-pa_lf.css — 200 — 13.4 KiB — 312 ms — h2https://toolswitch.dev/_next/static/chunks/1m3h2hnjxg8a0.js/_next/static/chunks/1m3h2hnjxg8a0.... https://toolswitch.dev/_next/static/chunks/1m3h2hnjxg8a0.js — 200 — 2.5 KiB — 180 ms — h2https://www.googletagmanager.com/gtag/js?id=G-SXFC45CFLPwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-SXFC45CFLP — 200 — 177.6 KiB — 292 ms — h2https://toolswitch.dev/_next/static/chunks/3fhvh40j_3uoe.js/_next/static/chunks/3fhvh40j_3uoe.... https://toolswitch.dev/_next/static/chunks/3fhvh40j_3uoe.js — 200 — 7.6 KiB — 167 ms — h2https://toolswitch.dev/_next/static/chunks/0jscyjiudjg-y.js/_next/static/chunks/0jscyjiudjg-y.... https://toolswitch.dev/_next/static/chunks/0jscyjiudjg-y.js — 200 — 70.1 KiB — 360 ms — h2https://toolswitch.dev/_next/static/chunks/286ftavv25fm3.js/_next/static/chunks/286ftavv25fm3.... https://toolswitch.dev/_next/static/chunks/286ftavv25fm3.js — 200 — 45.4 KiB — 356 ms — h2https://toolswitch.dev/_next/static/chunks/turbopack-2c3mg3r-05n1w.js/_next/static/chunks/turbopack-2c3m... https://toolswitch.dev/_next/static/chunks/turbopack-2c3mg3r-05n1w.js — 200 — 4.4 KiB — 194 ms — h2https://toolswitch.dev/_next/static/chunks/0hd3vn9vslnhb.js/_next/static/chunks/0hd3vn9vslnhb.... https://toolswitch.dev/_next/static/chunks/0hd3vn9vslnhb.js — 200 — 3.5 KiB — 318 ms — h2https://toolswitch.dev/_next/static/chunks/14uv7bafx4dsp.js/_next/static/chunks/14uv7bafx4dsp.... https://toolswitch.dev/_next/static/chunks/14uv7bafx4dsp.js — 200 — 297 B — 187 ms — h2https://toolswitch.dev/_next/static/chunks/0wsu0v0jk8ep3.js/_next/static/chunks/0wsu0v0jk8ep3.... https://toolswitch.dev/_next/static/chunks/0wsu0v0jk8ep3.js — 200 — 14.5 KiB — 318 ms — h2https://toolswitch.dev/_next/static/chunks/1vosv2eoljs8f.js/_next/static/chunks/1vosv2eoljs8f.... https://toolswitch.dev/_next/static/chunks/1vosv2eoljs8f.js — 200 — 11.8 KiB — 328 ms — h2https://toolswitch.dev/_next/static/chunks/2aazh53ya-jxs.js/_next/static/chunks/2aazh53ya-jxs.... https://toolswitch.dev/_next/static/chunks/2aazh53ya-jxs.js — 200 — 1.4 KiB — 334 ms — h2https://toolswitch.dev/favicon.ico/favicon.ico https://toolswitch.dev/favicon.ico — 200 — 761 B — 168 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
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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