Slack Core Web Vitals
How real Chrome users experience slack.com, from Google's Chrome UX Report: the 75th percentile of visits on every device.
Slack passes Core Web Vitals
Sep 25 – Oct 22, all devices
INP
83 ms
Good
LCP
1.9 s
Good
CLS
0.07
Good
FCP
1.7 s
Good
TTFB
794 ms
Good
INP over time
Weekly p75. The dashed line is the 200 ms "good" threshold.
What the numbers say
- Slack passes Core Web Vitals: LCP 1.9 s, CLS 0.07, INP 83 ms are all in Google's "good" range for 3 in 4 visits.
- Among 16 productivity and collaboration sites we track, Slack has the 4th fastest LCP.
- INP has held steady around 84 ms over the last 25 weeks.
Keep a site like this from getting slower
Real-user data shows a regression weeks after it ships. Vitalgate runs Lighthouse on every pull request and fails the check when a change breaks budgets like these: LCP ≤ 2.5 s, CLS ≤ 0.10, FCP ≤ 1.8 s.
Other productivity and collaboration sites
| Site | Core Web Vitals | LCP | INP | CLS |
|---|---|---|---|---|
| Notion | Fails | 4.9 s | 153 ms | 0.01 |
| Asana | Fails | 2.0 s | 216 ms | 0.15 |
| Trello | Fails | 3.9 s | 161 ms | 0.24 |
| Monday.com | Passes | 2.4 s | 177 ms | 0.02 |
| ClickUp | Passes | 2.4 s | 169 ms | 0.03 |
| Airtable | Passes | 1.9 s | 103 ms | 0.01 |
| Miro | Fails | 4.9 s | 222 ms | 0.07 |
| Loom | Fails | 4.2 s | 146 ms | 0.08 |
| Calendly | Fails | 5.3 s | 170 ms | 0.02 |
| Zoom | Fails | 5.5 s | 113 ms | 0.07 |
| Dropbox | Fails | 3.8 s | 245 ms | 0.09 |
| Todoist | Passes | 1.4 s | 96 ms | 0.04 |
| Obsidian | Passes | 1.1 s | 45 ms | 0.00 |
| Discord | Fails | 6.3 s | 299 ms | 0.10 |
| Zapier | Passes | 2.2 s | 126 ms | 0.06 |