CoreWebVitalsPulse results for slack.com
CoreWebVitalsPulse found 7 of 10 signals on slack.com (score 60/100) in an automated read-only check on 2026-10-27. Not detected: No more than 1 render-blocking script in <head>; Images declare width and height (prevents layout shift); HTML arrives in under 0.8 s.
Automated read-only check of public pages on 2026-10-27; it may be incomplete. slack.com is not affiliated with Zalwin, and this is not a rating of the company or its products. Own this site? Request a correction or removal (handled within 48 hours).
60/100
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What the check found
- ✓ HTML under 300 KB (medium · found)
237 KB of HTML. - ○ No more than 1 render-blocking script in <head> 🔒 Copy-paste fix: click to unlock → (high · not detected)
4 blocking scripts in <head>. - ✓ At most 8 third-party script domains (medium · found)
4: a.slack-edge.com, cdn.cookielaw.org, reveal.clearbit.com, d34u8crftukxnk.cloudfront.net - ✓ At most 20 external scripts (low · found)
17 external scripts. - ✓ Web fonts use font-display: swap (medium · found)
No web fonts found in the HTML. - ○ Images declare width and height (prevents layout shift) 🔒 Copy-paste fix: click to unlock → (high · not detected)
73 of 79 images lack width/height. - ✓ Below-the-fold images lazy-load (medium · found)
66 of 79 images use loading="lazy". - ✓ Preconnect or preload hints for critical third parties (low · found)
1 preconnect, 0 preload. - ✓ Mobile viewport meta tag (medium · found)
Present. - ○ HTML arrives in under 0.8 s 🔒 Copy-paste fix: click to unlock → (medium · not detected)
1224 ms from our server.
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A free, read-only check of the page-level causes of poor Core Web Vitals: HTML weight, render-blocking scripts, third-party script load, font loading, image sizing that causes layout shift, lazy loading and resource…
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CoreWebVitalsPulse on other sites
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