Performance

· 15 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.

412 ms

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

1.48 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.

0.007

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

1.11 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.

1.48 s

Page Load Progression

439 ms

878 ms

1.3 s

1.8 s

2.2 s

2.6 s

3.1 s

3.5 s

Checks

8 PASS 4 REVIEW 1 FIX

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.

Page Weight Budget

Action

1.9 MB transferred, 56 requests

REVIEW

1.9 MB transferred, 56 requests

Page weighs 3.1 MB (1.9 MB transferred)

Images are 1.5 MB — compress or use modern formats

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

Got: 1.5 MB

56 HTTP requests

Estimated 0.40 g CO2 per page load

1.9 MB transferred

56 requests

0.40 g CO2 per page load

Images 1.5 MiB 81%

JavaScript 176.5 KiB 9%

Fonts 66.4 KiB 3%

CSS 63.7 KiB 3%

HTML 31.8 KiB 2%

Other 26.8 KiB 1%

Other 1.7 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

Image Optimization

32 images, 0 KB saveable

REVIEW

32 images, 0 KB saveable

All images are well-optimized

32 images 1.5 MB

0 oversized -0 KB

28 legacy format

0 missing dimensions CLS risk

JS Bundles

8 scripts, 63 KB unused

REVIEW

8 scripts, 63 KB unused

https://buzzsumo.com/wp-content/themes/brandwatch/...: 41 KB unused (50%)

Consider code splitting or tree shaking to reduce unused code.

https://app.buzzsumo.com/consent-manager.js: 22 KB unused (35%)

Consider code splitting or tree shaking to reduce unused code.

https://app.buzzsumo.com/consent-manager.js: unminified — 38 KB could be saved

Total unused JavaScript: 63 KB

63 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://buzzsumo.com/wp-content/themes/brandwatch/build/modules/core/module-core.js?ver=1664881361	82 KB	41 KB (50%)	✓	1st
https://app.buzzsumo.com/consent-manager.js	64 KB	22 KB (35%)	✗	3rd
https://buzzsumo.com/wp-content/themes/brandwatch/templates/header/at-load.js?ver=1697612669	1 KB	—	✓	1st
https://buzzsumo.com/wp-content/themes/brandwatch/assets/dist/js/lib/tiny-slider.min.js	13 KB	—	✓	1st
https://app.buzzsumo.com/assets/js/cookies.js	1 KB	—	✓	3rd
https://buzzsumo.com/wp-content/themes/brandwatch/assets/dist/js/custom.js?ver=1684140834	2 KB	—	✓	1st
https://buzzsumo.com/wp-content/themes/brandwatch/build/modules/blog/module-blog.js?ver=1664881359	9 KB	—	✓	1st
https://js.partnerstack.com/v1/	4 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

Page Weight Inventory

Action

56 resources · 1.9 MB · 63 KB savings available

REVIEW

56 resources · 1.9 MB · 63 KB savings available

Page weight 914 KB over 1MB target

Got: 1.9 MB Expected: ≤ 1 MB

~63 KB of savings available

13 third-party resources (5% of weight)

3 resources over 200KB

56 resources · 1.9 MiB · 13 third-party 913.7 KiB over 1MB target

Image 82% · 1.6 MiB

JavaScript 9% · 176.5 KiB

Font 3% · 66.4 KiB

CSS 3% · 63.7 KiB

Document 2% · 31.8 KiB

Other 0% · 3.4 KiB

~63.4 KiB of savings available

Remove unused JavaScript: 63.4 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

56 resources			1.9 MiB

A+

Third-Party Impact

5% third-party, 0 ms blocking

PASS

5% third-party, 0 ms blocking

Third-party code accounts for 5% of page weight (96.1 KiB of 1.9 MiB)

Third-party blocking time is low (0 ms)

95%

First-party Third-party

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

JS Execution Cost

450ms total JS execution

PASS

450ms total JS execution

https://buzzsumo.com/: 324ms CPU time

Unattributable: 125ms CPU time

Third-party scripts: 125ms (28% of total)

Main Thread Breakdown

Other 42% Style & Layout 25% Script Evaluation 15% Rendering 9% Script Parsing & Compilation 4% Parse HTML & CSS 4%

Script	Total	Scripting	Parse/Compile	Party
https://buzzsumo.com/	324ms	21ms	3ms	1st
Unattributable	125ms	14ms	0ms	3rd

A+

Font Loading

5 fonts (66 KB)

PASS

5 fonts (66 KB)

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

Web fonts

66 KB total

Render-blocking

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

roboto-light.woff2 woff2 swap

Size 15 KB

Load time 33 ms

Start 517 ms