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Great job

Thank you for this code :) Saved me a lot of time!

I see it's also based on: https://thoughtbot.com/blog/how-to-handle-large-amounts-of-data-on-maps

I implemented also code for animation (from this article):

nativeMap.DidAddAnnotationViews += NativeMap_DidAddAnnotationViews;

private void AddBouncingTo(UIView view)
        {
            var bounceAnimation = new CAKeyFrameAnimation { KeyPath = "transform.scale" };
            bounceAnimation.Values = new NSObject[] { NSNumber.FromDouble(0.05), NSNumber.FromDouble(1.1), NSNumber.FromDouble(0.9), NSNumber.FromDouble(1) };
            bounceAnimation.Duration = 0.6;
            var timingFunctions = new List<CAMediaTimingFunction>();
            for (var i = 0; i < 4; i++)
            {
                timingFunctions.Add(CAMediaTimingFunction.FromName(CAMediaTimingFunction.EaseInEaseOut));
            }
            bounceAnimation.TimingFunctions = timingFunctions.ToArray();
            bounceAnimation.RemovedOnCompletion = false;
            view.Layer.AddAnimation(bounceAnimation, "bounce");
        }

        private void NativeMap_DidAddAnnotationViews(object sender, MKMapViewAnnotationEventArgs e)
        {
            foreach (var view in e.Views)
            {
                AddBouncingTo(view);
            }
        }

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