Session recording impact React sites
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.
2
Providers ranked
After min-sites filter
389
Sites in sample
Combined across all items
0.05
Best CLS (p75)
Microsoft Clarity
The State of Web Vitals · October 2026 · React sites (9,570) · phone field datacorewebvitals.io/state-of-cwv
2
The ranking sorted by CLS at p75, fastest first
| # | Provider | CLS p75 | Passing | Sites | |
|---|---|---|---|---|---|
| 1 | Microsoft Clarity | 0.05 | 80.4% | 243 | |
| 2 | Hotjar | 0.06 | 88.2% | 146 |
The State of Web Vitals · October 2026 · React sites (9,570) · phone field datacorewebvitals.io/state-of-cwv
3
Passing CLS per provider which group passes the CLS most often
ProviderSitesPassing CLSp75
Mouseflow 0.1% 9 0.02
Contentsquare 0.4% 35 0.03
Hotjar 1.5% 146 0.06
PostHog Replay 0.1% 8 0.02
Microsoft Clarity 2.5% 243 0.05
Crazy Egg 0.1% 6 0.03
FullStory 0.1% 6 0.23
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
88% of Hotjar sites pass CLS. Microsoft Clarity trails 8 points behind. computed
The State of Web Vitals · October 2026 · React sites (9,570) · phone 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 2.5%
642.9s
91161ms
800.05
562.4s
341.8s
Hotjar 1.5%
662.8s
86162ms
880.06
642.4s
441.7s
Contentsquare 0.4%
623.2s
91170ms
930.03
562.5s
441.4s
Mouseflow 0.1%
1001.7s
100153ms
1000.02
1001.1s
100655ms
PostHog Replay 0.1%
832.0s
83169ms
830.02
831.5s
501.1s
Crazy Egg 0.1%
672.7s
100146ms
750.03
02.2s
01.7s
FullStory 0.1%
203.7s
20398ms
200.23
1001.6s
80769ms
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.
Hotjar leads on CLS: 88% of its sites pass. Microsoft Clarity trails at 80%. computed
The State of Web Vitals · October 2026 · React sites (9,570) · phone field datacorewebvitals.io/state-of-cwv
Related signals Search (6) → JS libraries (26) → Scheduling (3) → Push notifications (5) → 210,902 crawled sites with Chrome field data, representing millions of real page loads · How we measured
210,902 crawled sites with Chrome field data, representing millions of real page loads. How we measured.