@ratherrandom good evening,
No, you shouldn’t see a performance hit from these Heartbeat-API-related events.
If nevertheless you are concerned and want to stop these requests altogether, you can disable the Heartbeat API altogether (via plugin or via functions.php). Clef logouts will still function without Heartbeat (i.e., you will be logged out of WP when you press the logout button on your phone), but without the Heartbeat API you will not be shown the WP logout modal when you log out (i.e., you won’t see that you are logged out until refreshing the page or attempting to browser to another dashboard page).
Keep in mind, though, that disabling Heartbeat means disabling it for all other plugins that use it; also, WP core uses it for autosaving and locking post editing (see the note on disabling it here).
