Is Xamarin.Forms.UriImageSource Async Method or Not?

Dear all,
I have a question about UriImageSource,

I always use UriImageSource in Custom ListView Cell.

new UriImageSource {
                Uri = new Uri("https://google.com/image/temptemp.jpg"),
                CachingEnabled = true,
                CacheValidity = new TimeSpan(5,0,0,0)
            };

But I thank that It's not a Async Method is it?
How can I use it about Asyc Method.
Please advice me.
Thank you very much and have a good day.