Performance

· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

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

Mobile Desktop

Performance

Accessibility

100

Best Practices

SEO

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

3.37 s

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

12.58 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.

4.70 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.

12.73 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

16 PASS 5 REVIEW 3 FIX

Page Weight Budget

Action

2.2 MB transferred, 155 requests

FIX

2.2 MB transferred, 155 requests

Page weighs 5.6 MB (2.2 MB transferred)

Images are 1.2 MB — compress or use modern formats

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Got: 1.2 MB

JavaScript is 679 KB — consider code splitting or lazy loading

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

Got: 679 KB

Fonts are 248 KB — consider subsetting or using system fonts

Subset fonts to include only used characters, or switch to system font stacks.

Got: 248 KB

155 HTTP requests — consider bundling or reducing

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Estimated 0.47 g CO2 per page load

2.2 MB transferred

155 requests

0.47 g CO2 per page load

Images 1.2 MiB 54%

JavaScript 678.9 KiB 30%

Fonts 247.6 KiB 11%

HTML 104.0 KiB 5%

CSS 5.9 KiB 0%

Other 2.8 KiB 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

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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

JS Execution Cost

Action

3241ms total JS execution

FIX

3241ms total JS execution

Unattributable: 1899ms CPU time

https://www.essethelabel.com/: 1342ms CPU time

Main Thread Breakdown

Other 57% Style & Layout 25% Parse HTML & CSS 7% Script Evaluation 7%

Script	Total	Scripting	Parse/Compile	Party
Unattributable	1899ms	31ms	0ms	1st
https://www.essethelabel.com/	1342ms	180ms	5ms	1st

Page Weight Inventory

Action

155 resources · 2.2 MB · 0 KB savings available

FIX

155 resources · 2.2 MB · 0 KB savings available

Page weight 2.2 MB exceeds 1 MB target by 1.2 MB

Got: 2.2 MB Expected: ≤ 1 MB

113 third-party resources (49% of weight)

1 resources over 200KB

155 resources · 2.2 MiB · 113 third-party 1.2 MiB over 1MB target

Image 55% · 1.2 MiB

JavaScript 30% · 678.9 KiB

Font 11% · 247.6 KiB

Document 5% · 104.0 KiB

CSS 0% · 5.9 KiB

Other 0% · 1.2 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

155 resources			2.2 MiB

Third-Party Impact

49% third-party, 0 ms blocking

REVIEW

49% third-party, 0 ms blocking

Third-party code accounts for 49% of page weight (1.1 MiB of 2.2 MiB)

Third-party blocking time is low (0 ms)

51%

49%

First-party Third-party

Image Optimization

115 images, 0 KB saveable

REVIEW

115 images, 0 KB saveable

All images are well-optimized

115 images 1.2 MB

0 oversized -0 KB

101 legacy format

0 missing dimensions CLS risk

JavaScript Blocking

1 JS blocking issue(s) detected

REVIEW

1 JS blocking issue(s) detected

34 render-blocking <script src> tag(s) without async/defer

Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.

CSS Performance Depth

2 CSS depth issue(s) detected

REVIEW

2 CSS depth issue(s) detected

5 render-blocking stylesheet(s) -- recommended: <=3

Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.

1 `@font-face` rule(s) without `font-display` -- causes FOIT

An `@font-face` rule without `font-display` causes Flash of Invisible Text (FOIT): the browser hides the styled text for up to 3 seconds while the custom font downloads, then either swaps to fallback (Chrome / Firefox) or stays invisible (older Safari). Add `font-display: swap` (shows fallback immediately, swaps in the custom font when ready) or `font-display: optional` (uses fallback if the font isn't ready in 100ms; never causes visible swap). Either eliminates FOIT outright.

HTTP Caching

private, max-age=0, must-revalidate

REVIEW

private, max-age=0, must-revalidate

Cache-Control header is set

Got: private, max-age=0, must-revalidate

ETag present — enables conditional (304) responses

Cache-Control

private, max-age=0, must-revalidate

Directive	Value	Meaning
private	—	Only browser cache, not CDN/proxy
max-age	0	Cache for 0 seconds
must-revalidate	—	Must recheck with server after expiry

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

5 fonts (248 KB)

PASS

5 fonts (248 KB)

5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

248 KB total

Render-blocking

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

roboto_n4.2019d890f07b1... woff2 swap

Size 31 KB

Load time 35 ms

Start 200 ms