Session recording impact
Session-recording tools ranked by performance impact.
1
At a glance the headline numbers for Session recording impact
Session-recording tools ranked by performance impact.
8
Providers ranked
After min-sites filter
7,824
Sites in sample
Combined across all items
0.07
Best CLS (p75)
Smartlook
The State of Web Vitals · Q1 2026 · 94,910 sites · desktop field datacorewebvitals.io/state-of-cwv
2
The ranking sorted by CLS at p75, fastest first
| # | Provider | CLS p75 | Passing | Sites | |
|---|---|---|---|---|---|
| 1 | Smartlook | 0.07 | 79.6% | 88 | |
| 2 | PostHog Replay | 0.07 | 85.5% | 166 | |
| 3 | Microsoft Clarity | 0.10 | 76.4% | 4,465 | |
| 4 | Crazy Egg | 0.11 | 70.8% | 93 | |
| 5 | Hotjar | 0.11 | 74.3% | 2,379 | |
| 6 | Mouseflow | 0.12 | 69.9% | 169 | |
| 7 | Contentsquare | 0.12 | 74.6% | 318 | |
| 8 | FullStory | 0.14 | 70.6% | 146 |
The State of Web Vitals · Q1 2026 · 94,910 sites · desktop field datacorewebvitals.io/state-of-cwv
3
Passing CLS per provider which group passes the CLS most often
ProviderSitesPassing CLSp75
PostHog Replay 0.2% 166 0.07
Smartlook 0.1% 88 0.07
Microsoft Clarity 4.7% 4,465 0.10
Lucky Orange 0% 38 0.09
Inspectlet 0% 15 0.10
Contentsquare 0.3% 318 0.12
Hotjar 2.5% 2,379 0.11
LogRocket 0% 16 0.11
Crazy Egg 0.1% 93 0.11
FullStory 0.2% 146 0.14
Mouseflow 0.2% 169 0.12
Good Needs Improvement Poor Sorted best-passing first · median colored by its own rating · pass = good CLS (0.1 at p75) · one value per site
86% of PostHog Replay sites pass CLS. Mouseflow trails 16 points behind, leaving 30% of its sites failing. computed
The State of Web Vitals · Q1 2026 · 94,910 sites · desktop field datacorewebvitals.io/state-of-cwv
4
All five vitals at once the whole category without toggling - cell is the pass rate, small number the p75
LCP
INP
CLS
FCP
TTFB
Microsoft Clarity 4.7%
852.1s
9882ms
760.10
811.6s
601.1s
Hotjar 2.5%
862.1s
9978ms
740.11
801.6s
591.2s
Contentsquare 0.3%
842.1s
9697ms
750.12
821.6s
67973ms
Mouseflow 0.2%
882.0s
9983ms
700.12
811.6s
631.0s
PostHog Replay 0.2%
792.3s
9995ms
860.07
801.7s
611.2s
FullStory 0.2%
762.5s
89102ms
710.14
801.6s
60995ms
Crazy Egg 0.1%
762.3s
10086ms
710.11
781.7s
571.3s
Smartlook 0.1%
842.2s
9865ms
800.07
741.9s
331.5s
Lucky Orange 0%
812.0s
10075ms
760.09
761.8s
76739ms
LogRocket 0%
712.5s
10091ms
710.11
711.9s
64858ms
Inspectlet 0%
1001.2s
10068ms
750.10
100806ms
100367ms
60%95%+ passing Cell: pass rate, small number = p75 · faded rows: under 100 sites
One row per provider, one column per vital - the cell is the share of sites passing, the small number the p75. No toggling needed to see where the category actually differs.
PostHog Replay leads on CLS: 86% of its sites pass. Mouseflow trails at 70%. computed
The State of Web Vitals · Q1 2026 · 94,910 sites · desktop field datacorewebvitals.io/state-of-cwv
Related signals Search (4) → JS libraries (22) → Scheduling (3) → Push notifications (4) → Chrome field data from 94,910 sites, representing millions of real page loads · How we measured
Chrome field data from 94,910 sites, representing millions of real page loads. How we measured.