OpenLayers Integration: Larger tile sizes for higher resolution monitors about qgis-js HOT 2 OPEN

If your concern is about using all the physical pixels available on a high dpi device, then this is already in place (see the QgisXYZDataSource). The pixelRatio is detected/managed by OpenLayers, multiplied with the default tile size (which is 265px in a xyz source) and also passed to the qgis-js renderXYZTile-function to be taken into account for symbols and fonts. So on a HighDPI device (window.devicePixelRatio = 2) one will get 512px (physical pixels) tiles which will be rendered to 256 CSS pixels (the same principle as demonstrated in the High DPI WMTS example)

If your concern is about the amount of parallel renderXYZTile-function calls, we could also go for a custom and dynamic TileGrid with an increased tile size on large maps. But this would mean that we're not in the commonly used XYZ scheme anymore and that the layer has to be recreated when the map size changes (demonstrated in the WMS 512x256 Tiles example)

We could also try to make the QgisCanvasDataSource cache the rendered tiles, as demonstrated in the Tiled WMS example.

from qgis-js.