diff --git a/src/lib/marble/geodata/data/GeoDataRelation.cpp b/src/lib/marble/geodata/data/GeoDataRelation.cpp
index e0556b8cf..90767a0d2 100644
--- a/src/lib/marble/geodata/data/GeoDataRelation.cpp
+++ b/src/lib/marble/geodata/data/GeoDataRelation.cpp
@@ -1,153 +1,163 @@
 //
 // This file is part of the Marble Virtual Globe.
 //
 // This program is free software licensed under the GNU LGPL. You can
 // find a copy of this license in LICENSE.txt in the top directory of
 // the source code.
 //
 // Copyright 2017    Dennis Nienhüser <nienhueser@kde.org>
 
 #include "GeoDataRelation.h"
 
 #include "GeoDataTypes.h"
 #include "OsmPlacemarkData.h"
 
 #include <QSet>
 
 namespace Marble
 {
 
 class GeoDataRelationPrivate
 {
 public:
     QSet<const GeoDataFeature*> m_features;
     OsmPlacemarkData m_osmData;
     QSet<qint64> m_memberIds;
 
+    mutable GeoDataRelation::RelationType m_relationType = GeoDataRelation::UnknownType;
+    mutable bool m_relationTypeDirty = true;
     static QHash<QString, GeoDataRelation::RelationType> s_relationTypes;
 };
 
 QHash<QString, GeoDataRelation::RelationType> GeoDataRelationPrivate::s_relationTypes;
 
 GeoDataRelation::GeoDataRelation() :
     GeoDataFeature(),
     d_ptr(new GeoDataRelationPrivate)
 {
     // nothing to do
 }
 
 GeoDataRelation::~GeoDataRelation()
 {
     delete d_ptr;
 }
 
 GeoDataRelation::GeoDataRelation(const GeoDataRelation &other) :
     GeoDataFeature(other),
     d_ptr(new GeoDataRelationPrivate)
 {
     Q_D(GeoDataRelation);
     d->m_features = other.d_func()->m_features;
     d->m_osmData = other.d_func()->m_osmData;
 }
 
 GeoDataRelation &GeoDataRelation::operator=(GeoDataRelation other) // passed by value
 {
     GeoDataFeature::operator=(other);
     std::swap(*this->d_ptr, *other.d_ptr);
     return *this;
 }
 
 const char *GeoDataRelation::nodeType() const
 {
     return GeoDataTypes::GeoDataRelationType;
 }
 
 GeoDataFeature *GeoDataRelation::clone() const
 {
     return new GeoDataRelation(*this);
 }
 
 void GeoDataRelation::addMember(const GeoDataFeature *feature, qint64 id, const QString &role)
 {
     Q_D(GeoDataRelation);
     d->m_features << feature;
     d->m_osmData.addRelation(id, role);
     d->m_memberIds << id;
 }
 
 QSet<const GeoDataFeature *> GeoDataRelation::members() const
 {
     Q_D(const GeoDataRelation);
     return d->m_features;
 }
 
 OsmPlacemarkData &GeoDataRelation::osmData()
 {
     Q_D(GeoDataRelation);
+    d->m_relationTypeDirty = true;
     return d->m_osmData;
 }
 
 const OsmPlacemarkData &GeoDataRelation::osmData() const
 {
     Q_D(const GeoDataRelation);
     return d->m_osmData;
 }
 
 GeoDataRelation::RelationType GeoDataRelation::relationType() const
 {
+    Q_D(const GeoDataRelation);
+    if (!d->m_relationTypeDirty) {
+        return d->m_relationType;
+    }
+
     if (GeoDataRelationPrivate::s_relationTypes.isEmpty()) {
         auto &map = GeoDataRelationPrivate::s_relationTypes;
         map["road"] = RouteRoad;
         map["detour"] = RouteDetour;
         map["ferry"] = RouteFerry;
         map["train"] = RouteTrain;
         map["subway"] = RouteSubway;
         map["tram"] = RouteTram;
         map["bus"] = RouteBus;
         map["trolleybus"] = RouteTrolleyBus;
         map["bicycle"] = RouteBicycle;
         map["mtb"] = RouteMountainbike;
         map["foot"] = RouteFoot;
         map["hiking"] = GeoDataRelation::RouteHiking;
         map["horse"] = RouteHorse;
         map["inline_skates"] = RouteInlineSkates;
     }
 
-    Q_D(const GeoDataRelation);
+    d->m_relationType = GeoDataRelation::UnknownType;
+    d->m_relationTypeDirty = false;
     if (d->m_osmData.containsTag(QStringLiteral("type"), QStringLiteral("route"))) {
         auto const route = d->m_osmData.tagValue(QStringLiteral("route"));
         if (route == QStringLiteral("piste")) {
             auto const piste = d->m_osmData.tagValue(QStringLiteral("piste:type"));
             if (piste == QStringLiteral("downhill")) {
-                return RouteSkiDownhill;
+                d->m_relationType = RouteSkiDownhill;
             } else if (piste == QStringLiteral("nordic")) {
-                return RouteSkiNordic;
+                d->m_relationType = RouteSkiNordic;
             } else if (piste == QStringLiteral("skitour")) {
-                return RouteSkitour;
+                d->m_relationType = RouteSkitour;
             } else if (piste == QStringLiteral("sled")) {
-                return RouteSled;
+                d->m_relationType = RouteSled;
             }
+        } else {
+            d->m_relationType = GeoDataRelationPrivate::s_relationTypes.value(route, UnknownType);
         }
-        return GeoDataRelationPrivate::s_relationTypes.value(route, UnknownType);
     }
 
-    return UnknownType;
+    return d->m_relationType;
 }
 
 QSet<qint64> GeoDataRelation::memberIds() const
 {
     Q_D(const GeoDataRelation);
     return d->m_memberIds;
 }
 
 bool GeoDataRelation::containsAnyOf(const QSet<qint64> &memberIds) const
 {
     Q_D(const GeoDataRelation);
 #if QT_VERSION >= 0x050600 // intersects was introduced in Qt 5.6.
         return d->m_memberIds.intersects(memberIds);
 #else
         return !(d->m_memberIds.intersect(memberIds).isEmpty());
 #endif
 }
 
 }