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

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.

604 ms

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

1.09 s

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

127 ms

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

0.025

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

1.52 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.

4.42 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

6 PASS 3 REVIEW 4 FIX

Page Weight Budget

Action

3.0 MB transferred, 176 requests

FIX

3.0 MB transferred, 176 requests

Page weighs 9.0 MB (3.0 MB transferred)

JavaScript is 1.7 MB — consider code splitting or lazy loading

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

Got: 1.7 MB

Fonts are 409 KB — consider subsetting or using system fonts

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

Got: 409 KB

176 HTTP requests — consider bundling or reducing

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

Estimated 0.64 g CO2 per page load

3.0 MB transferred

176 requests

0.64 g CO2 per page load

JavaScript 1.7 MiB 56%

Images 707.1 KiB 23%

Fonts 408.7 KiB 13%

Other 100.1 KiB 3%

HTML 61.8 KiB 2%

CSS 51.6 KiB 2%

Other 25.0 KiB 1%

Other 13.9 KiB 0%

Other 544 B 0%

Other 453 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

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

3751ms total JS execution

FIX

3751ms total JS execution

https://grist.org/wp-content/themes/grist/dist/ven...: 1701ms CPU time

https://grist.org/: 477ms CPU time

Unattributable: 429ms CPU time

https://cdn.userway.org/remediation/2026-04-14-10-...: 362ms CPU time

https://consent.cookiebot.com/3f5c049a-7407-416b-b...: 135ms CPU time

Third-party scripts: 1470ms (39% of total)

Main Thread Breakdown

Script Evaluation 46% Other 27% Style & Layout 10% Rendering 9%

Script	Total	Scripting	Parse/Compile	Party
https://grist.org/wp-content/themes/grist/dist/vendor.js?ver=0.16.28	1701ms	588ms	14ms	1st
https://grist.org/	477ms	8ms	3ms	1st
Unattributable	429ms	110ms	0ms	3rd
https://cdn.userway.org/remediation/2026-04-14-10-40-20/paid/remediation-tool.js?ts=1776163220800	362ms	353ms	3ms	3rd
https://consent.cookiebot.com/3f5c049a-7407-416b-bc5a-861f63f9ab95/cc.js?renew=false&referer=grist.org&dnt=false&init=false	135ms	56ms	8ms	3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js	132ms	115ms	10ms	3rd
https://www.googletagmanager.com/gtag/js?id=G-8L4CPT2Q80&cx=c&gtm=4e64h1	131ms	92ms	10ms	3rd
https://cdn.wisepops.com/shared/wisepops/WfBjvuM6AwWqxUtKeXDF/591370.js?v=1773340452545	123ms	100ms	8ms	3rd
https://grist.org/wp-content/themes/grist/dist/app.js?ver=0.16.28	102ms	79ms	2ms	1st
https://consent.cookiebot.com/uc.js	99ms	89ms	4ms	3rd

Showing top 10 of 11 scripts

JS Bundles

Action

75 scripts, 749 KB unused

FIX

75 scripts, 749 KB unused

https://grist.org/wp-content/themes/grist/dist/ven...: 155 KB unused (70%)

Consider code splitting or tree shaking to reduce unused code.

https://grist.org/wp-content/themes/grist/dist/ven...: 155 KB unused (70%)

Consider code splitting or tree shaking to reduce unused code.

https://securepubads.g.doubleclick.net/pagead/mana...: 106 KB unused (56%)

Consider code splitting or tree shaking to reduce unused code.

https://www.googletagmanager.com/gtm.js?id=GTM-WBD...: 77 KB unused (48%)

Consider code splitting or tree shaking to reduce unused code.

https://www.googletagmanager.com/gtag/destination?...: 66 KB unused (50%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 749 KB

749 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://grist.org/wp-content/themes/grist/dist/vendor.js?ver=0.16.28	222 KB	155 KB (70%)	✓	1st
https://grist.org/wp-content/themes/grist/dist/vendor.js?ver=0.16.28	0 KB	155 KB (70%)	✓	1st
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js	188 KB	106 KB (56%)	✓	3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WBDMG4S	159 KB	77 KB (48%)	✓	3rd
https://www.googletagmanager.com/gtag/destination?id=AW-735548782&cx=c&gtm=4e64h1	134 KB	66 KB (50%)	✓	3rd
https://www.googletagmanager.com/gtag/js?id=G-8L4CPT2Q80&cx=c&gtm=4e64h1	173 KB	65 KB (38%)	✓	3rd
https://cdn.wisepops.com/shared/wisepops/WfBjvuM6AwWqxUtKeXDF/591370.js?v=1773340452545	113 KB	40 KB (36%)	✓	3rd
https://connect.facebook.net/en_US/fbevents.js	97 KB	34 KB (35%)	✓	3rd
https://cdn.userway.org/widgetapp/2026-04-14-10-40-20/widget_app_base_1776163220800.js	48 KB	25 KB (52%)	✓	3rd
https://consent.cookiebot.com/3f5c049a-7407-416b-bc5a-861f63f9ab95/cc.js?renew=false&referer=grist.org&dnt=false&init=false	111 KB	24 KB (22%)	✓	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

176 resources · 3.0 MB · 749 KB savings available

FIX

176 resources · 3.0 MB · 749 KB savings available

Page weight 2.0 MB over 1MB target

Got: 3.0 MB Expected: ≤ 1 MB

~749 KB of savings available

104 third-party resources (51% of weight)

1 resources over 200KB

176 resources · 3.0 MiB · 104 third-party 2.0 MiB over 1MB target

JavaScript 56% · 1.7 MiB

Image 23% · 708.0 KiB

Font 13% · 408.7 KiB

Other 4% · 137.8 KiB

Document 2% · 62.9 KiB

CSS 2% · 51.6 KiB

~748.6 KiB of savings available

Remove unused JavaScript: 748.6 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

176 resources			3.0 MiB

Third-Party Impact

51% third-party, 0 ms blocking

REVIEW

51% third-party, 0 ms blocking

Third-party code accounts for 51% of page weight (1.6 MiB of 3.0 MiB)

Third-party blocking time is low (0 ms)

49%

51%

First-party Third-party

Image Optimization

29 images, 0 KB saveable

REVIEW

29 images, 0 KB saveable

is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

29 images 707 KB

0 oversized -0 KB

14 legacy format

1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

10 fonts (409 KB)

PASS

10 fonts (409 KB)

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

Web fonts

409 KB total

Render-blocking

of 10

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

basis-grotesque-bold-pr... woff2 swap

Size 48 KB

Load time 15 ms

Start 179 ms