Performance

· 17 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

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.

13.74 s

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

29.01 s

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

7.29 s

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.095

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

13.74 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.

44.21 s

Page Load Progression

1.1 s

2.3 s

3.4 s

4.6 s

5.7 s

6.8 s

8.0 s

9.1 s

Checks

7 PASS 2 REVIEW 6 FIX

Page Weight Budget

Action

8.4 MB transferred, 412 requests

FIX

8.4 MB transferred, 412 requests

Page weighs 24.6 MB (8.4 MB transferred)

JavaScript is 4.7 MB — consider code splitting or lazy loading

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

Got: 4.7 MB

Fonts are 369 KB — consider subsetting or using system fonts

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

Got: 369 KB

CSS is 218 KB — consider purging unused styles

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Got: 218 KB

412 HTTP requests — consider bundling or reducing

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

Estimated 1.8 g CO2 per page load

8.4 MB transferred

412 requests

1.8 g CO2 per page load

JavaScript 4.7 MiB 55%

Other 1.4 MiB 16%

Other 1.2 MiB 15%

Images 383.4 KiB 4%

Fonts 368.7 KiB 4%

CSS 218.3 KiB 3%

Other 107.7 KiB 1%

HTML 89.9 KiB 1%

Other 20.1 KiB 0%

Other 3.2 KiB 0%

Other 949 B 0%

Other 0 B 0%

0 2.4 MB 4.9 MB

Over budget

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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

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

Third-Party Impact

Action

100% third-party, 0 ms blocking

FIX

100% third-party, 0 ms blocking

Third-party code accounts for 100% of page weight (8.4 MiB of 8.4 MiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

JS Execution Cost

Action

24718ms total JS execution

FIX

24718ms total JS execution

https://www.klaviyo.com/_astro/page.Dw4hn96J.js: 3745ms CPU time

Unattributable: 3622ms CPU time

https://www.klaviyo.com/: 2414ms CPU time

https://t.contentsquare.net/uxa/d7d7a4ae1fff8.js: 2078ms CPU time

https://www.klaviyo.com/_astro/client.Q4PGvSu9.js: 1158ms CPU time

Third-party scripts: 24718ms (100% of total)

Main Thread Breakdown

Script Evaluation 63% Other 20% Style & Layout 7% Script Parsing & Compilation 6%

Script	Total	Scripting	Parse/Compile	Party
https://www.klaviyo.com/_astro/page.Dw4hn96J.js	3745ms	2631ms	1ms	3rd
Unattributable	3622ms	1023ms	0ms	3rd
https://www.klaviyo.com/	2414ms	149ms	9ms	3rd
https://t.contentsquare.net/uxa/d7d7a4ae1fff8.js	2078ms	1824ms	78ms	3rd
https://www.klaviyo.com/_astro/client.Q4PGvSu9.js	1158ms	654ms	1ms	3rd
https://www.klaviyo.com/_astro/rive.Bj7h2rbT.js	1068ms	1063ms	1ms	3rd
https://spider.australiarevival.com/i/596102f2751010ba2ee94856a2df358e.js	1030ms	696ms	16ms	3rd
https://www.googletagmanager.com/gtm.js?id=GTM-M28G2G	825ms	676ms	88ms	3rd
https://www.klaviyo.com/_astro/OnLoad.astro_astro_type_script_index_0_lang.C_04mnp4.js	764ms	678ms	9ms	3rd
https://js.hs-analytics.net/analytics/1776361500000/48163345.js	663ms	439ms	15ms	3rd

Showing top 10 of 43 scripts

JS Bundles

Action

174 scripts, 1.6 MB unused

FIX

174 scripts, 1.6 MB unused

https://www.klaviyo.com/_astro/useTranslation.B20N...: 261 KB unused (74%)

Consider code splitting or tree shaking to reduce unused code.

https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)

Consider code splitting or tree shaking to reduce unused code.

https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)

Consider code splitting or tree shaking to reduce unused code.

https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)

Consider code splitting or tree shaking to reduce unused code.

https://js.hsforms.net/forms/embed/v2.js: 113 KB unused (61%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 1.6 MB

1682 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://www.klaviyo.com/_astro/useTranslation.B20NgLB9.js	357 KB	261 KB (74%)	✓	3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js	0 KB	177 KB (49%)	✓	3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js	362 KB	177 KB (49%)	✓	3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js	362 KB	177 KB (49%)	✓	3rd
https://js.hsforms.net/forms/embed/v2.js	193 KB	113 KB (61%)	✓	3rd
https://t.contentsquare.net/uxa/d7d7a4ae1fff8.js	143 KB	67 KB (47%)	✓	3rd
https://www.googletagmanager.com/gtag/js?id=G-E2RS7HT946&cx=c&gtm=4e64f0h1	171 KB	64 KB (38%)	✓	3rd
https://www.googletagmanager.com/gtag/destination?id=DC-11549644&cx=c&gtm=4e64f0h1	132 KB	61 KB (46%)	✓	3rd
https://www.googletagmanager.com/gtag/destination?id=AW-997744385&cx=c&gtm=4e64f0h1	137 KB	59 KB (43%)	✓	3rd
https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMA.js	106 KB	57 KB (54%)	✓	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

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

Page Weight Inventory

Action

412 resources · 8.4 MB · 1.6 MB savings available

FIX

412 resources · 8.4 MB · 1.6 MB savings available

Page weight 7.4 MB over 1MB target

Got: 8.4 MB Expected: ≤ 1 MB

~1.6 MB of savings available

411 third-party resources (100% of weight)

9 resources over 200KB

412 resources · 8.4 MiB · 411 third-party 7.4 MiB over 1MB target

JavaScript 55% · 4.7 MiB

Other 16% · 1.4 MiB

Media 15% · 1.2 MiB

Font 6% · 501.8 KiB

Image 4% · 384.9 KiB

CSS 3% · 218.3 KiB

Document 1% · 99.5 KiB

~1.6 MiB of savings available

Remove unused JavaScript: 1.6 MiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

412 resources			8.4 MiB

HTTP Caching

Action

No cache headers

FIX

No cache headers

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.

Image Optimization

71 images, 0 KB saveable

REVIEW

71 images, 0 KB saveable

All images are well-optimized

71 images 383 KB

0 oversized -0 KB

51 legacy format

0 missing dimensions CLS risk

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

18 fonts (502 KB)

PASS

18 fonts (502 KB)

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

Web fonts

502 KB total

Render-blocking

of 18

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

instrument-sans-normal.... woff2 swap

Size 30 KB

Load time 33 ms

Start 755 ms

Risk FOUT — text flashes from fallback to web font

KlaviyoDegularVar.woff2 woff2 swap

Size 90 KB

Load time 37 ms

Start 756 ms

Risk FOUT — text flashes from fallback to web font

DMMono-Regular.woff2 woff2 swap

Size 15 KB

Load time 39 ms

Start 756 ms

Risk FOUT — text flashes from fallback to web font

KFO7CnqEu92Fr1ME7kSn66a... woff2 swap

Size 34 KB

Load time 27 ms

Start 2.2 s

Risk FOUT — text flashes from fallback to web font

instrument-sans-latin-4... ttf swap

Size 21 KB

Load time 36 ms

Start 2.3 s

Risk FOUT — text flashes from fallback to web font

Convert to woff2 for ~30% smaller file size

instrument-sans-latin-7... ttf swap

Size 22 KB

Load time 33 ms

Start 2.3 s

Risk FOUT — text flashes from fallback to web font

Convert to woff2 for ~30% smaller file size

DMMono-Regular.ttf ttf swap

Size 25 KB

Load time 38 ms

Start 2.3 s

Risk FOUT — text flashes from fallback to web font

Convert to woff2 for ~30% smaller file size

instrument-sans-latin-6... ttf swap

Size 22 KB

Load time 60 ms

Start 2.3 s

Risk FOUT — text flashes from fallback to web font

Convert to woff2 for ~30% smaller file size

instrument-sans-latin-4... ttf swap

Size 0 KB

Load time 40 ms

Start 2.3 s

Risk FOUT — text flashes from fallback to web font

Convert to woff2 for ~30% smaller file size

instrument-sans-latin-4... ttf swap

Size 0 KB

Load time 47 ms

Start 2.3 s

Risk FOUT — text flashes from fallback to web font

Convert to woff2 for ~30% smaller file size

instrument-sans-latin-5... ttf swap

Size 21 KB

Load time 35 ms

Start 2.3 s

Risk FOUT — text flashes from fallback to web font

Convert to woff2 for ~30% smaller file size

instrument-sans-latin-6... ttf swap

Size 0 KB

Load time 47 ms

Start 2.3 s

Risk FOUT — text flashes from fallback to web font

Convert to woff2 for ~30% smaller file size

instrument-sans-latin-4... ttf swap

Size 22 KB

Load time 38 ms

Start 2.3 s

Risk FOUT — text flashes from fallback to web font

Convert to woff2 for ~30% smaller file size

DMMono-Regular.ttf ttf swap

Size 0 KB

Load time 32 ms

Start 2.3 s

Risk FOUT — text flashes from fallback to web font

Convert to woff2 for ~30% smaller file size

DMMono-Regular.ttf ttf swap

Size 0 KB

Load time 37 ms

Start 2.3 s

Risk FOUT — text flashes from fallback to web font

Convert to woff2 for ~30% smaller file size

DMMono-Regular.ttf ttf swap

Size 0 KB

Load time 30 ms

Start 2.3 s

Risk FOUT — text flashes from fallback to web font

Convert to woff2 for ~30% smaller file size

Inter-Regular.f1f0c35b.... woff2 swap

Size 97 KB

Load time 39 ms

Start 6.0 s

Risk FOUT — text flashes from fallback to web font

Inter-SemiBold.fcb100c7... woff2 swap

Size 104 KB

Load time 39 ms

Start 6.0 s

Risk FOUT — text flashes from fallback to web font

Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need

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 ~92 KB and ~184 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

1 hints, 0 missing preconnects

PASS

1 hints, 0 missing preconnects

Page uses 1 resource hint(s)

Current Resource Hints

preconnect

preload

—

dns-prefetch

—

prefetch

—

1 resource hints configured

A+

Render-Blocking Resources

No render-blocking resources detected

PASS

No render-blocking resources detected

No render-blocking resources detected in <head>

A+

Third-Party Resources

No third-party resources detected

PASS

No third-party resources detected

Network Waterfall

412 requests over 8431ms

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 24718ms · 2438KB · $142/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
www.klaviyo.com www.klaviyo.com	Other	3745ms	35 KB	—	$21/mo	Costly
Unattributable Unattributable	Other	3622ms	0 KB	—	$21/mo	Costly
www.klaviyo.com www.klaviyo.com	Other	2414ms	56 KB	—	$14/mo	Costly
t.contentsquare.net t.contentsquare.net	Other	2078ms	143 KB	47%	$12/mo	Costly
www.klaviyo.com www.klaviyo.com	Other	1158ms	55 KB	42%	$7/mo	Costly
www.klaviyo.com www.klaviyo.com	Other	1068ms	35 KB	—	$6/mo	Costly
spider.australiarevival.com spider.australiarevival.com	Other	1030ms	45 KB	—	$6/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	825ms	201 KB	28%	$5/mo	Costly
www.klaviyo.com www.klaviyo.com	Other	764ms	1 KB	—	$4/mo	Costly
HubSpot Analytics js.hs-analytics.net	Analytics	663ms	43 KB	—	$4/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	548ms	171 KB	38%	$3/mo	Costly
js.qualified.com js.qualified.com	Other	484ms	116 KB	49%	$3/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	484ms	145 KB	35%	$3/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	409ms	144 KB	39%	$2/mo	Costly
bite.australiarevival.com bite.australiarevival.com	Other	401ms	2 KB	—	$2/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	389ms	137 KB	43%	$2/mo	Costly
analytics.tiktok.com analytics.tiktok.com	Other	388ms	106 KB	54%	$2/mo	Costly
www.gstatic.com www.gstatic.com	Other	387ms	0 KB	49%	$2/mo	Costly
transcend-cdn.com transcend-cdn.com	Other	359ms	52 KB	52%	$2/mo	Costly
js.qualified.com js.qualified.com	Other	316ms	94 KB	51%	$2/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	280ms	132 KB	46%	$2/mo	Costly
j.6sc.co j.6sc.co	Other	272ms	19 KB	—	$2/mo	Costly
www.redditstatic.com www.redditstatic.com	Other	267ms	19 KB	—	$2/mo	Costly
Facebook Pixel connect.facebook.net	Advertising	246ms	44 KB	—	$1/mo	Costly
transcend-cdn.com transcend-cdn.com	Other	221ms	93 KB	48%	$1/mo	Costly
Facebook Pixel connect.facebook.net	Advertising	176ms	96 KB	34%	$1/mo	Optional
js.hsforms.net js.hsforms.net	Other	173ms	193 KB	61%	$1/mo	Optional
Facebook Pixel connect.facebook.net	Advertising	159ms	18 KB	—	$1/mo	Optional
static.klaviyo.com static.klaviyo.com	Other	157ms	9 KB	—	$1/mo	Optional
Heap Analytics cdn.heapanalytics.com	Analytics	137ms	42 KB	—	$1/mo	Optional
Bing UET bat.bing.com	Advertising	134ms	15 KB	—	$1/mo	Optional
www.klaviyo.com www.klaviyo.com	Other	114ms	14 KB	—	$1/mo	Optional
cdn-0.d41.co cdn-0.d41.co	Other	114ms	30 KB	—	$1/mo	Optional
LinkedIn Insight snap.licdn.com	Advertising	107ms	19 KB	—	$1/mo	Optional
px.mountain.com px.mountain.com	Other	94ms	1 KB	—	$1/mo	Optional
dx.mountain.com dx.mountain.com	Other	87ms	6 KB	—	$0/mo	Optional
static.klaviyo.com static.klaviyo.com	Other	82ms	4 KB	—	$0/mo	Optional
Twitter/X Pixel static.ads-twitter.com	Advertising	70ms	13 KB	—	$0/mo	Optional
analytics.tiktok.com analytics.tiktok.com	Other	65ms	40 KB	—	$0/mo	Optional
static.klaviyo.com static.klaviyo.com	Other	60ms	20 KB	—	$0/mo	Optional
cdn.pdst.fm cdn.pdst.fm	Other	57ms	10 KB	—	$0/mo	Optional
tag.demandbase.com tag.demandbase.com	Other	56ms	18 KB	—	$0/mo	Optional
www.klaviyo.com www.klaviyo.com	Other	55ms	1 KB	—	$0/mo	Optional

www.klaviyo.com

Other

Costly

Execution 3745ms

Transfer 35 KB

Monthly Cost $21/mo

Unattributable

Other

Costly

Execution 3622ms

Transfer 0 KB

Monthly Cost $21/mo

www.klaviyo.com

Other

Costly

Execution 2414ms

Transfer 56 KB

Monthly Cost $14/mo

t.contentsquare.net

Other

Costly

Execution 2078ms

Transfer 143 KB

Unused 47%

Monthly Cost $12/mo

www.klaviyo.com

Other

Costly

Execution 1158ms

Transfer 55 KB

Unused 42%

Monthly Cost $7/mo

www.klaviyo.com

Other

Costly

Execution 1068ms

Transfer 35 KB

Monthly Cost $6/mo

spider.australiarevival.com

Other

Costly

Execution 1030ms

Transfer 45 KB

Monthly Cost $6/mo

Google Tag Manager

Tag Manager

Costly

Execution 825ms

Transfer 201 KB

Unused 28%

Monthly Cost $5/mo

www.klaviyo.com

Other

Costly

Execution 764ms

Transfer 1 KB

Monthly Cost $4/mo

HubSpot Analytics

Analytics

Costly

Execution 663ms

Transfer 43 KB

Monthly Cost $4/mo

Google Tag Manager

Tag Manager

Costly

Execution 548ms

Transfer 171 KB

Unused 38%

Monthly Cost $3/mo

js.qualified.com

Other

Costly

Execution 484ms

Transfer 116 KB

Unused 49%

Monthly Cost $3/mo

Google Tag Manager

Tag Manager

Costly

Execution 484ms

Transfer 145 KB

Unused 35%

Monthly Cost $3/mo

Google Tag Manager

Tag Manager

Costly

Execution 409ms

Transfer 144 KB

Unused 39%

Monthly Cost $2/mo

bite.australiarevival.com

Other

Costly

Execution 401ms

Transfer 2 KB

Monthly Cost $2/mo

Google Tag Manager

Tag Manager

Costly

Execution 389ms

Transfer 137 KB

Unused 43%

Monthly Cost $2/mo

analytics.tiktok.com

Other

Costly

Execution 388ms

Transfer 106 KB

Unused 54%

Monthly Cost $2/mo

www.gstatic.com

Other

Costly

Execution 387ms

Transfer 0 KB

Unused 49%

Monthly Cost $2/mo

transcend-cdn.com

Other

Costly

Execution 359ms

Transfer 52 KB

Unused 52%

Monthly Cost $2/mo

js.qualified.com

Other

Costly

Execution 316ms

Transfer 94 KB

Unused 51%

Monthly Cost $2/mo

Google Tag Manager

Tag Manager

Costly

Execution 280ms

Transfer 132 KB

Unused 46%

Monthly Cost $2/mo

j.6sc.co

Other

Costly

Execution 272ms

Transfer 19 KB

Monthly Cost $2/mo

www.redditstatic.com

Other

Costly

Execution 267ms

Transfer 19 KB

Monthly Cost $2/mo

Facebook Pixel

Advertising

Costly

Execution 246ms

Transfer 44 KB

Monthly Cost $1/mo

transcend-cdn.com

Other

Costly

Execution 221ms

Transfer 93 KB

Unused 48%

Monthly Cost $1/mo

Facebook Pixel

Advertising

Optional

Execution 176ms

Transfer 96 KB

Unused 34%

Monthly Cost $1/mo

js.hsforms.net

Other

Optional

Execution 173ms

Transfer 193 KB

Unused 61%

Monthly Cost $1/mo

Facebook Pixel

Advertising

Optional

Execution 159ms

Transfer 18 KB

Monthly Cost $1/mo

static.klaviyo.com

Other

Optional

Execution 157ms

Transfer 9 KB

Monthly Cost $1/mo

Heap Analytics

Analytics

Optional

Execution 137ms

Transfer 42 KB

Monthly Cost $1/mo

Bing UET

Advertising

Optional

Execution 134ms

Transfer 15 KB

Monthly Cost $1/mo

www.klaviyo.com

Other

Optional

Execution 114ms

Transfer 14 KB

Monthly Cost $1/mo

cdn-0.d41.co

Other

Optional

Execution 114ms

Transfer 30 KB

Monthly Cost $1/mo

LinkedIn Insight

Advertising

Optional

Execution 107ms

Transfer 19 KB

Monthly Cost $1/mo

px.mountain.com

Other

Optional

Execution 94ms

Transfer 1 KB

Monthly Cost $1/mo

dx.mountain.com

Other

Optional

Execution 87ms

Transfer 6 KB

Monthly Cost $0/mo

static.klaviyo.com

Other

Optional

Execution 82ms

Transfer 4 KB

Monthly Cost $0/mo

Twitter/X Pixel

Advertising

Optional

Execution 70ms

Transfer 13 KB

Monthly Cost $0/mo

analytics.tiktok.com

Other

Optional

Execution 65ms

Transfer 40 KB

Monthly Cost $0/mo

static.klaviyo.com

Other

Optional

Execution 60ms

Transfer 20 KB

Monthly Cost $0/mo

cdn.pdst.fm

Other

Optional

Execution 57ms

Transfer 10 KB

Monthly Cost $0/mo

tag.demandbase.com

Other

Optional

Execution 56ms

Transfer 18 KB

Monthly Cost $0/mo

www.klaviyo.com

Other

Optional

Execution 55ms

Transfer 1 KB

Monthly Cost $0/mo

These scripts may cost more than they're worth

www.klaviyo.com adds 3745ms and costs ~$21/month
Unattributable adds 3622ms and costs ~$21/month
www.klaviyo.com adds 2414ms and costs ~$14/month
t.contentsquare.net adds 2078ms and costs ~$12/month
www.klaviyo.com adds 1158ms and costs ~$7/month
www.klaviyo.com adds 1068ms and costs ~$6/month
spider.australiarevival.com adds 1030ms and costs ~$6/month
Google Tag Manager adds 825ms and costs ~$5/month
www.klaviyo.com adds 764ms and costs ~$4/month
HubSpot Analytics adds 663ms and costs ~$4/month
Google Tag Manager adds 548ms and costs ~$3/month
js.qualified.com adds 484ms and costs ~$3/month
Google Tag Manager adds 484ms and costs ~$3/month
Google Tag Manager adds 409ms and costs ~$2/month
bite.australiarevival.com adds 401ms and costs ~$2/month
Google Tag Manager adds 389ms and costs ~$2/month
analytics.tiktok.com adds 388ms and costs ~$2/month
www.gstatic.com adds 387ms and costs ~$2/month
transcend-cdn.com adds 359ms and costs ~$2/month
js.qualified.com adds 316ms and costs ~$2/month
Google Tag Manager adds 280ms and costs ~$2/month
j.6sc.co adds 272ms and costs ~$2/month
www.redditstatic.com adds 267ms and costs ~$2/month
Facebook Pixel adds 246ms and costs ~$1/month
transcend-cdn.com adds 221ms and costs ~$1/month

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.

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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.klaviyo.com takes 3745ms 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

Unattributable takes 3622ms 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.klaviyo.com takes 2414ms 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

t.contentsquare.net takes 2078ms 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.klaviyo.com takes 1158ms 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.klaviyo.com takes 1068ms 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

spider.australiarevival.com takes 1030ms 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

Google Tag Manager takes 825ms 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.klaviyo.com takes 764ms 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

HubSpot Analytics takes 663ms 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

Google Tag Manager takes 548ms 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

js.qualified.com takes 484ms 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

Google Tag Manager takes 484ms 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

Google Tag Manager takes 409ms 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

bite.australiarevival.com takes 401ms 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

Google Tag Manager takes 389ms 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

analytics.tiktok.com takes 388ms 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

54% of analytics.tiktok.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.gstatic.com takes 387ms 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

transcend-cdn.com takes 359ms 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

52% of transcend-cdn.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

js.qualified.com takes 316ms 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 js.qualified.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

Google Tag Manager takes 280ms 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

j.6sc.co takes 272ms 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.redditstatic.com takes 267ms 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

Facebook Pixel takes 246ms 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

transcend-cdn.com takes 221ms 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

61% of js.hsforms.net'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

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.