void Workspace::activityPopupAboutToShow()
{
.....
    foreach (const QString &id, openActivities_) {
^^^^^^^^^ LOOP!!
        KActivities::Info activity(id);
        QString name = activity.name();
SYNC DBUS CALL ^^^^^^^^^^^^^^^^
        name.replace('&', "&&");
        action = activity_popup->addAction(KIcon(activity.icon()), name);
                                     SYNC DBUS CALL ^^^^^^^^^^^^^^^^
...
}

ie. for eg. 4 activities we timeout 4 minutes - i'd like to say sth. about hiding such in library functions that look like member accesses....