For long, image-heavy feeds, what approaches keep scrolling smooth in a CollectionView?

For long, image-heavy feeds, use element recycling, batched data updates, downsampled and cached images, lightweight item templates, and background image loading. These reduce UI workload and keep the CollectionView scrolling smoothly even with large image feeds.

<CollectionView ItemsLayout="VerticalList"
                ItemSizingStrategy="MeasureFirstItem"
                RecycleElement="True"
                RemainingItemsThreshold="3"
                RemainingItemsThresholdReached="OnLoadMore">
    <CollectionView.ItemTemplate>
        <DataTemplate>
            <Grid HeightRequest="240">
                <!-- Use UriImageSource to enable caching; constrain size for downsampling -->
                <Image Aspect="AspectFill"
                       HeightRequest="240"
                       WidthRequest="400">
                    <Image.Source>
                        <UriImageSource Uri="{Binding ThumbnailUrl}"
                                        CachingEnabled="True"
                                        CacheValidity="7.00:00:00" />
                    </Image.Source>
                </Image>
            </Grid>
        </DataTemplate>
    </CollectionView.ItemTemplate>
</CollectionView>