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
0.12
Best CLS (p75)
Microsoft Clarity
The State of Web Vitals · October 2026 · React sites (9,570) · desktop field datacorewebvitals.io/state-of-cwv
2
The ranking sorted by CLS at p75, fastest first
| # | Provider | CLS p75 | Passing | Sites | |
|---|---|---|---|---|---|
| 1 | Microsoft Clarity | 0.12 | 69.6% | 243 | |
| 2 | Hotjar | 0.15 | 67.5% | 146 |
The State of Web Vitals · October 2026 · React sites (9,570) · desktop field datacorewebvitals.io/state-of-cwv
3
Passing CLS per provider which group passes the CLS most often
ProviderSitesPassing CLSp75
PostHog Replay 0.1% 8 0.04
Crazy Egg 0.1% 6 0.11
Contentsquare 0.4% 35 0.13
Microsoft Clarity 2.5% 243 0.12
Hotjar 1.5% 146 0.15
Mouseflow 0.1% 9 0.25
FullStory 0.1% 6 0.18
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
No provider stands out: pass rates sit between 68% and 70%. computed
The State of Web Vitals · October 2026 · React sites (9,570) · 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 2.5%
672.8s
9975ms
700.12
592.3s
321.9s
Hotjar 1.5%
732.6s
9985ms
680.15
652.2s
471.6s
Contentsquare 0.4%
762.4s
10073ms
720.13
722.2s
521.3s
Mouseflow 0.1%
1001.6s
10081ms
670.25
831.2s
83577ms
PostHog Replay 0.1%
802.4s
100116ms
1000.04
602.3s
601.9s
Crazy Egg 0.1%
332.8s
10050ms
750.11
252.2s
02.0s
FullStory 0.1%
03.6s
25313ms
250.18
1001.3s
100697ms
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.
Microsoft Clarity leads on CLS: 70% of its sites pass. Hotjar trails at 68%. computed
The State of Web Vitals · October 2026 · React sites (9,570) · desktop 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.