Unsolved MapPolyline slow repaint problem

[jankes]

Hi. I'm creating navigation app. I'm drawing route that was already traveled with one color and route to travel with another one. I have problem that while navigation marker is moving fluently route is drawing with some delay. I'm updating polyline point on my navigation marker coordinate change:

   Connections {
            enabled: navigation.running
            target: naviArrowItem

            onCoordinateChanged: {
                routeBefore.replaceCoordinate(routeBefore.pathLength()-1,target.coordinate)
                routeToGo.replaceCoordinate(0,target.coordinate)
                RideSimulationModel.updateCoordinate(target.coordinate)
            }
        }

When replacing polyline with MapCircle there is no problem with latency (circle coordinate change is instant).
Maybe somebody know how to deal with this issue?