requests to the DC controller every 5 seconds

I have a calendar connected to roundcube via caldav, in the logs and in tcpdump I see calls to the user server every 5 seconds. Along with this, the ldap user also sends 3 requests to the DC server. For what ? and why ? And can it be controlled? For example, reduce the time to access the DC controller

“PROPFIND /remote.php/dav HTTP/1.1” 207 645 “-” “sabre-dav/4.4.0 (” “-”
“PROPFIND /remote.php/dav/principals/users/user_3671/ HTTP/1.1” 207 587 “-” “sabre-dav/4.4.0 (” “-”
“PROPFIND /remote.php/dav/calendars/user_3671/ HTTP/1.1” 207 2214 “-” “sabre-dav/4.4.0 (” “-”

A similar situation was here Excessive propfind connections