Performance

· 22 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

100

Performance

Accessibility

Best Practices

100

SEO

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

414 ms

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

690 ms

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.

422 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.

690 ms

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

13 PASS 6 REVIEW

JS Bundles

1 scripts, 64 KB unused

REVIEW

1 scripts, 64 KB unused

https://www.googletagmanager.com/gtag/js?id=G-PLBH...: 64 KB unused (41%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 64 KB

64 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://www.googletagmanager.com/gtag/js?id=G-PLBHMZT9E5	157 KB	64 KB (41%)	✓	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

HTTP/3 (QUIC)

HTTP/3 not advertised

REVIEW

HTTP/3 not advertised

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.

Compression Algorithm

Action

Main response served uncompressed

REVIEW

Main response served uncompressed

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.

Server-Timing Observability

No Server-Timing header found

REVIEW

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.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

HTTP Caching

public,max-age=0,must-revalidate

REVIEW

public,max-age=0,must-revalidate

Cache-Control header is set

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

ETag present — enables conditional (304) responses

Cache-Control

public,max-age=0,must-revalidate

Directive	Value	Meaning
public	—	Any cache may store this response
max-age	0	Cache for 0 seconds
must-revalidate	—	Must recheck with server after expiry

A+

Page Weight Budget

616 KB transferred, 8 requests

PASS

616 KB transferred, 8 requests

Page weighs 1.1 MB (616 KB transferred)

8 HTTP requests

Estimated 0.13 g CO2 per page load

616 KB transferred

8 requests

0.13 g CO2 per page load

Images 311.5 KiB 51%

JavaScript 157.2 KiB 26%

Fonts 139.9 KiB 23%

CSS 3.0 KiB 0%

HTML 2.6 KiB 0%

Other 1.6 KiB 0%

Other 547 B 0%

0 2.4 MB 4.9 MB

Under budget

Third-Party Impact

26% third-party, 0 ms blocking

PASS

26% third-party, 0 ms blocking

Third-party code accounts for 26% of page weight (157.7 KiB of 616.4 KiB)

Third-party blocking time is low (0 ms)

74%

26%

First-party Third-party

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

Image Optimization

1 images, 0 KB saveable

PASS

1 images, 0 KB saveable

https://hannahseo.com/assets/images/hannah-seo.jpg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

1 images 312 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+

JS Execution Cost

55ms total JS execution

PASS

55ms total JS execution

https://www.googletagmanager.com/gtag/js?id=G-PLBH...: 55ms CPU time

Third-party scripts: 55ms (100% of total)

Main Thread Breakdown

Script Evaluation 44% Other 31% Style & Layout 13% Script Parsing & Compilation 7%

Script	Total	Scripting	Parse/Compile	Party
https://www.googletagmanager.com/gtag/js?id=G-PLBHMZT9E5	55ms	47ms	8ms	3rd

A+

Font Loading

2 fonts (140 KB)

PASS

2 fonts (140 KB)

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

Web fonts

140 KB total

Render-blocking

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

dosis.ttf ttf swap

Size 56 KB

Load time 122 ms

Start 155 ms

Risk FOUT — text flashes from fallback to web font

Convert to woff2 for ~30% smaller file size

playfair-display-medium... ttf swap

Size 84 KB

Load time 123 ms

Start 155 ms

Risk FOUT — text flashes from fallback to web font

Convert to woff2 for ~30% smaller file size

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 ~42 KB and ~84 ms

A+

Resource Caching

All resources properly cached

PASS

All resources properly cached

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

No optimization needed

PASS

No optimization needed

No resource hint issues

A+

LCP Image Preload

LCP preload audit not available

PASS

LCP preload audit not available

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

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

A+

Server Response Intelligence

3 server-response signal(s) detected

PASS

3 server-response signal(s) detected

`Cache-Status` header present (RFC 9211): "Netlify Edge"; fwd=miss

The page returns a `Cache-Status` header -- the standardized way for CDNs and caches to communicate per-hop cache state to debugging tools. Format: `Cache-Status: cdn-name; hit; ttl=300` (or `; fwd=miss` / `; fwd=stale`). Standard alternative to vendor-specific `X-Cache` patterns each CDN had historically. Cloudflare, Fastly, and Akamai all support emitting it.

`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).

`ETag` present -- conditional GET supported

A+

Page Weight Inventory

8 resources · 616 KB · 64 KB savings available

PASS

8 resources · 616 KB · 64 KB savings available

Within 1MB page-weight target

Got: 616 KB

~64 KB of savings available

2 third-party resources (26% of weight)

1 resources over 200KB

8 resources · 616.4 KiB · 2 third-party Within 1MB page-weight target

Image 51% · 311.5 KiB

JavaScript 26% · 157.2 KiB

Font 23% · 139.9 KiB

Document 1% · 4.2 KiB

CSS 0% · 3.0 KiB

Other 0% · 547 B

~64.5 KiB of savings available

Remove unused JavaScript: 64.5 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

8 resources			616.4 KiB

Network Waterfall

8 requests over 484ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

Per-script blocking time, transfer cost, and cache headers

INFO

100% of JavaScript execution is third-party

First-party Third-party 55ms · 157KB · $0/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Google Tag Manager www.googletagmanager.com	Tag Manager	55ms	157 KB	41%	$0/mo	Optional

Google Tag Manager

Tag Manager

Optional

Execution 55ms

Transfer 157 KB

Unused 41%

Monthly Cost $0/mo

100% 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

How third-party costs are calculated

Image Optimization

1 images, 311 KB total, 266 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

311 KB

Oversized

Wasted

266 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.