Hello. In my case, problem was be with orthogonalScrollingBehavior when collection has active heightAnchor. I find two solutions: Switch this property to default and use configuration.scrollDirection instead Change heightAnchor to intrinsticContentSize of collection

Autolayout engine has cache, I think it's reason for bad memory usage, but reusable cells in UITableView/UICollectionView allows autolayout engine clear extra cache