While analyzing the slow action, I came across one action in which total duration is about 92 seconds, but in the User Action Purepath I couldn't identify any objects attribute to the slowness. It seems to me that the action should be completed about 10 seconds. See attached. whatcause.gif
It looks like there are no server side requests for this user action.
You can check the navigation timings by right clicking on the useraction and selecting details, to get more information where the time is spent.
If that does not help, please post a Screenshot with the whole User Action PurePath visible.