addSource / updateGeoJSON slow performance on Android

[felixkrautschuk]

When loading a 1 megabyte GeoJSON source to a map style and measure the time, I see a huge performance difference between Android and iOS.

var dateTimeNow = DateTime.now();

await mapboxMap?.style.addSource(
        GeoJsonSource(
          id: "my_source",
          data: jsonEncode(myGeoJSON)
        )
);

print(DateTime.now().difference(dateTimeNow).inMilliseconds);

Android:    1500ms (sometimes even more) iOS:            130ms

I tested on Emulators as well as physical devices, the results are the same.

The same behaviour also occurs when using source.updateGeoJSON(...).

When building a native Android app, working with large GeoJSON sources in Mapbox did not result in performance issues like this.

Here you can find the full sample project: flutter_mapbox.zip

[evil159]

Hi @felixkrautschuk, thank you for the report! I see you are also measuring json encoding in your test: jsonEncode(myGeoJSON), could you perform the same test with encoding being out of the scope of measurement?

[felixkrautschuk]

@evil159 thanks for your reply!

I put the json encoding outside the measurement, but the result is still the same.

[cjouannet]

I have the same issue for my app. Adding a geojson source on iOS takes between 90ms and 150ms, whereas on Android it takes between 500ms and 900ms.

I have a map on the home page of my application that loads 15 geojson without performance issues, but when i push a new page, instanciate a new map and load those same geojson on the new map, it takes 5 times longer than the first map (which is still in memory)

We used to be on a fork of the repo matching the 0.5.0 and there was no performance issue regarding geojson source loading.

I tried to change the androidHostingMode on the second map (to either AndroidPlatformViewHostingMode.TLHC_HC or AndroidPlatformViewHostingMode.VD) and the performances are much better

[felixkrautschuk]

For updating features, a fix is provided in version 2.3.0:

mapboxMap.style.updateGeoJSONSourceFeatures(sourceId, dataId, features);

This is working on my side.

[byte-art]

For updating features, a fix is provided in version 2.3.0:

mapboxMap.style.updateGeoJSONSourceFeatures(sourceId, dataId, features);

This is working on my side.

When I add source by :

await mapboxMap.style.addSource( GeoJsonSource( id: 'focus', data: jsonEncode(transToFeature(spotList)), cluster: focusMenu.type != MapConst.trip, clusterMaxZoom: MapConst.clusterMaxZoom, clusterRadius: 50, ), )

And update by:

await mapboxMap.style.updateGeoJSONSourceFeatures('focus', 'data', features);

but not working for me.