Cookies per site
Cookies set during a cold visit: how many and their total size.
At a glance the headline numbers for Cookies per site
Cookies set during a cold visit: how many and their total size.
The typical site sets 2 cookies.
Distribution & median INP site count and median INP at each level of cookies per site — n
Passing INP by cookies per site — n which level passes the INP most often
Cookies per site — n 2. p75 5. p99 21. At the low end (0–0): INP 46ms. At the high end (10+): INP 59ms. computed
Cookies per site — size the value at each percentile across all sites
Cookies per site — size 0 KB. p75 0 KB. p99 2 KB. computed
Why this matters for the Core Web Vitals, and where to start fixing it
The cookie count is a proxy. It tells you how many vendors run on the page. Most cookies exist for tracking and each tracker sets its own. The count grows with every tag the marketing stack adds. Cookies are also sent with every request to their domain, which adds header weight. That is rarely the real cost.
The real cost is what the cookies stand for. The vendors behind them run script on your main thread and delay every interaction (INP). They also inject banners, widgets and ads after the page looks settled (CLS). A rising cookie count means it is time to audit the tag manager, not to shrink cookies.
Chrome field data from 189,915 sites, representing millions of real page loads. How we measured.