Performance
· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
1.72 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
7.68 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.29 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.007
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
10.36 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.
20.07 s
Page Load Progression
542 ms 1.1 s 1.6 s 2.2 s 2.7 s 3.3 s
3.8 s
4.3 sFPage Weight BudgetAction2.6 MB transferred, 171 requestsFIX
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
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.
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.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
FJS Execution CostAction14174ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://grist.org/wp-content/themes/grist/dist/vendor.js?ver=0.16.28 | 5849ms | 1630ms | 48ms | 1st |
| https://grist.org/ | 1861ms | 37ms | 17ms | 1st |
| Unattributable | 1597ms | 404ms | 0ms | 3rd |
| https://cdn.userway.org/remediation/2026-04-14-10-40-20/paid/remediation-tool.js?ts=1776163220800 | 1180ms | 1143ms | 10ms | 3rd |
| https://consent.cookiebot.com/3f5c049a-7407-416b-bc5a-861f63f9ab95/cc.js?renew=false&referer=grist.org&dnt=false&init=false | 501ms | 214ms | 29ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 479ms | 412ms | 40ms | 3rd |
| https://cdn.wisepops.com/shared/wisepops/WfBjvuM6AwWqxUtKeXDF/591370.js?v=1773340452545 | 439ms | 399ms | 30ms | 3rd |
| https://grist.org/wp-content/themes/grist/dist/app.js?ver=0.16.28 | 388ms | 303ms | 8ms | 1st |
| https://consent.cookiebot.com/uc.js | 339ms | 289ms | 13ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-8L4CPT2Q80&cx=c>m=4e64h1 | 291ms | 247ms | 39ms | 3rd |
Showing top 10 of 22 scripts
FJS BundlesAction75 scripts, 754 KB unusedFIX
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 | 157 KB (71%) | ✓ | 1st |
| https://grist.org/wp-content/themes/grist/dist/vendor.js?ver=0.16.28 | 0 KB | 157 KB (71%) | ✓ | 1st |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 188 KB | 108 KB (57%) | ✓ | 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>m=4e64h1 | 134 KB | 66 KB (50%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-8L4CPT2Q80&cx=c>m=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 | 27 KB (57%) | ✓ | 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.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction171 resources · 2.6 MB · 754 KB savings availableFIX
~754.4 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 171 resources | 2.6 MiB | ||||||
BThird-Party Impact60% third-party, 0 ms blockingREVIEW
BImage Optimization26 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Performance issues directly impact user engagement and conversion rates.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading10 fonts (409 KB)PASS
Web fonts
10
409 KB total
Render-blocking
0
of 10
Dominant font-display
swap
Most common across fonts
Font loading timeline
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)
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints1 hints, 0 missing preconnectsPASS
Current Resource Hints
1 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
AHTTP Cachingmax-age=300 (5 minutes)PASS
max-age=300, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| max-age | 300 | Cache for 5 minutes |
| must-revalidate | — | Must recheck with server after expiry |
Network Waterfall171 requests over 34046msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 1597ms | 0 KB | — | $21/mo | Costly |
cdn.userway.org cdn.userway.org | Other | 1180ms | 39 KB | — | $16/mo | Costly |
consent.cookiebot.com consent.cookiebot.com | Other | 501ms | 111 KB | 22% | $7/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 479ms | 188 KB | 57% | $6/mo | Costly |
cdn.wisepops.com cdn.wisepops.com | Other | 439ms | 113 KB | 36% | $6/mo | Costly |
consent.cookiebot.com consent.cookiebot.com | Other | 339ms | 36 KB | — | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 291ms | 173 KB | 38% | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 233ms | 159 KB | 48% | $3/mo | Costly |
cdn.userway.org cdn.userway.org | Other | 142ms | 48 KB | 57% | $2/mo | Optional |
static.chartbeat.com static.chartbeat.com | Other | 137ms | 16 KB | — | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 131ms | 134 KB | 50% | $2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 115ms | 97 KB | 35% | $2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 114ms | 45 KB | — | $2/mo | Optional |
loader.wisepops.com loader.wisepops.com | Other | 89ms | 0 KB | — | $1/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 62ms | 34 KB | — | $1/mo | Optional |
static.chartbeat.com static.chartbeat.com | Other | 62ms | 11 KB | — | $1/mo | Optional |
LinkedIn Insight snap.licdn.com | Advertising | 61ms | 19 KB | — | $1/mo | Optional |
Twitter/X Pixel static.ads-twitter.com | Advertising | 56ms | 13 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 1597ms and costs ~$21/month
- cdn.userway.org adds 1180ms and costs ~$16/month
- consent.cookiebot.com adds 501ms and costs ~$7/month
- securepubads.g.doubleclick.net adds 479ms and costs ~$6/month
- cdn.wisepops.com adds 439ms and costs ~$6/month
- consent.cookiebot.com adds 339ms and costs ~$4/month
- Google Tag Manager adds 291ms and costs ~$4/month
- Google Tag Manager adds 233ms and costs ~$3/month
43% of JavaScript execution time comes from third-party scripts.
Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.
Learn more ▾ ▴
Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.
Source: web.dev / HTTP Archive Web Almanac
Unattributable takes 1597ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
cdn.userway.org takes 1180ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
consent.cookiebot.com takes 501ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
securepubads.g.doubleclick.net takes 479ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
57% of securepubads.g.doubleclick.net's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
cdn.wisepops.com takes 439ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
consent.cookiebot.com takes 339ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 291ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 233ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
57% of cdn.userway.org's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev