When I make a modification on the site, it does not appear after refreshing the page. It appears at least 10 minutes, not before.
The inconvenience is that of a client: when he disconnects for example, when you refresh it is always marked “connected”. He must also wait before being able to log in with another account.
Please disable third-party plugins and customizations (if there are any) and check if this issue persists. If you use a caching plugin, make sure that caching is disabled for logged-in users. If these recommendations do not help, please contact your hosting provider, as caching may be possible on their end.