slow osgearth widget after adding place points

[AhmedAredah]

I have about 800 points with labels that I am loading into a map (WGS 84 map) of the whole earth model (i am using the world.tif file from the test folder). The widget is smooth in zooming and navigating until I load the points to the map. My question is that is there anyway that I can optimize it?
Side note: I am getting the following in the console when i load the points "[osgearth debug] [GeoTransform] onTileUpdate fail condition 2"

    void
    addPort()
    {
        // load sea ports
        QVector<std::shared_ptr<ShipNetSimCore::SeaPort>> ports =
            ShipNetSimCore::OptimizedNetwork::loadFirstAvailableSeaPorts();

        // Style our labels:
        osgEarth::Style labelStyle;
        labelStyle.getOrCreate<osgEarth::TextSymbol>()->alignment() =
            osgEarth::TextSymbol::ALIGN_CENTER_CENTER;
        labelStyle.getOrCreate<osgEarth::TextSymbol>()->fill()->color() =
            osgEarth::Color::White;

        osg::ref_ptr<osg::Group> labelGroup = new osg::Group();
        osgEarth::Style pm;

        std::string icon =
            ShipNetSimCore::Utils::
            getFirstExistingPathFromList(Defaults::iconPath).toStdString();

        pm.getOrCreate<osgEarth::IconSymbol>()->url()->setLiteral( icon );
        pm.getOrCreate<osgEarth::IconSymbol>()->declutter() = true;
        pm.getOrCreate<osgEarth::TextSymbol>()->halo() =
            osgEarth::Color("#5f5f5f");

        osg::ref_ptr<osg::Group> parentGroup = new osg::Group();

        const osgEarth::SpatialReference* geoSRS =
            mapNode->getMapSRS()->getGeographicSRS();

        // Add ports to the map
        for (std::shared_ptr<ShipNetSimCore::SeaPort> port : ports) {
            QString labelText = port->getPortName() +
                                " (" + port->getPortCode() + ")";
            auto label = new osgEarth::PlaceNode(
                osgEarth::GeoPoint(
                    geoSRS,
                    port->getPortCoordinate().getLongitude().value(),
                    port->getPortCoordinate().getLatitude().value(), 
                    0,
                    osgEarth::AltitudeMode::ALTMODE_RELATIVE),
                labelText.toStdString(),
                pm);
            label->setStyle(labelStyle);
            labelGroup->addChild(label);
            mapNode->addChild(labelGroup);
        }
    }

[gwaldron]

When you use ALTMODE_RELATIVE the system will try to re-clamp every point each time a new tile pages in. 800 is a lot. Consider setting this to ALTMODE_ABSOLUTE unless you really think you need the dynamic clamping.

If it's just a frame-rate issue, there is not a lot you can do. 800 icons+labels is a lot especially if there are no decluttered.

(You can ignore the debug message; it is just explaining that it could not clamp a point b/c it falls outside the bounds of a tile.)

[AhmedAredah]

@gwaldron Thank you for your reply. It is very helpful.