Podría ser un problema de algoritmo.

usó

 var markers = new Map(); (for markers) var routes = new Array(); (for lines from pt a to b and etc)

 const step = (pointsObj) => { if (pointsObj.i < routes.length) { if (routes.length > 1) // move the user along the line by 1 step () var pointA = routes[pointsObj.i]; var pointB = routes[pointsObj.i + 1]; // user moving gradually to the next point userMarker.setLatLng( new L.LatLng( userMarker.getLatLng().lat + (pointB.lat - pointA.lat) / maxNumSteps, userMarker.getLatLng().lng + (pointB.lng - pointA.lng) / maxNumSteps ) ); // number of steps user taking to move forward currentNumSteps++; // once the user reaches point B, set pointA = pointB and pointB = point C if (currentNumSteps == maxNumSteps) pointsObj.i++; } };