CODEWITHSUNDEEP
iosswiftperformancegoogle-maps
James Y
James Y

Reputation: 113

Performance issue in Google Maps for iOS when more than 840 markers on map

I'm profiling my app and finding that Google Maps (v2.0.1) for iOS is pegging the CPU when creating more than 840 markers on the map. As soon as I create that 841st marker, CPU peg about 98%.

    func loadMarkers() {

    if(mapView != nil) {

        let objects = objectAPI.getObjects()

        for (index, object) in objects.enumerate() {

                let marker = GMSMarker()
                marker.snippet = object.title
                marker.position = CLLocationCoordinate2D(latitude: object.lat.doubleValue, longitude: object.lng.doubleValue)
                marker.icon = GMSMarker.markerImageWithColor(UIColor.redColor())                                        
                marker.map = mapView                
            }
        }

The trace shows that it's performance is killed in EntityRenderer::Draw. Why random 840 markers? If I render 840 markers or less, then no problem. Same behavior on Simulator and 6s Plus device.

Running Time    Self (ms)       Symbol Name
422370.0ms   98.5%  5.0       -[GMSDisplayLink displayLinkFired:]
422364.0ms   98.5%  7.0        -[GMSEntityRendererView draw]
422351.0ms   98.5%  0.0         -[GMSPhoenixRenderer drawIfNeeded]
422331.0ms   98.5%  341.0            gmscore::renderer::EntityRenderer::Draw(bool)
213215.0ms   49.7%  1373.0            (anonymous namespace)::StickerBehavior::Commit(gmscore::renderer::EntityRenderer*)
186073.0ms   43.4%  17786.0            (anonymous namespace)::StickerBehavior::SelectFrame(UIImage*, double, double)

Upvotes: 3

Views: 1392

Answers (1)

James Y
James Y

Reputation: 113

The solution to this performance problem is to reuse the uiimage for marker icon:

    let objects = objectAPI.getObjects()

    let markerImage = GMSMarker.markerImageWithColor(UIColor.redColor())

    for (index, object) in objects.enumerate() {

            let marker = GMSMarker()
            marker.snippet = object.title
            marker.position = CLLocationCoordinate2D(latitude: object.lat.doubleValue, longitude: object.lng.doubleValue)
            marker.icon = markerImage                                        
            marker.map = mapView                
     }

Upvotes: 1

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