I am puzzled by a deluge of warnings like "This code path does I/O on the main thread underneath that can lead to UI responsiveness issues. Consider ways to optimize this code path" on code that sems perfectly inocuous, like `class FileOrFolderCell: UICollectionViewCell { //... let emojiLabelInitialFontSize: CGFloat = 64. //<--- flagged as a potential hang pont (wha!!?) //... var isNew = false { //<--- potential hang point didSet { newBadge.isHidden = !isNew } } //.... }` Can anybody offer insights on how to address this? Thanks.