How can the image loading time in the application be improved?

To improve image loading times in an application, several approaches can be used:

• Image optimization: compression without quality loss, using modern formats (WebP, HEIF).
• Lazy loading: load images only when they appear in the user's viewport.
• Caching: use local cache and HTTP caching for reusing loaded images.
• CDN: store and serve images through a Content Delivery Network to reduce delays.
• Asynchronous loading: load images in the background without blocking the main UI thread.
• Image sizes: adjust the image size to match the display size to avoid loading unnecessary bytes.

Example in Swift using lazy loading and caching:

let imageCache = NSCache<NSString, UIImage>()

func loadImage(from urlString: String, completion: @escaping (UIImage?) -> Void) {
    if let cachedImage = imageCache.object(forKey: urlString as NSString) {
        completion(cachedImage)
        return
    }
    guard let url = URL(string: urlString) else {
        completion(nil)
        return
    }
    DispatchQueue.global().async {
        if let data = try? Data(contentsOf: url), let image = UIImage(data: data) {
            imageCache.setObject(image, forKey: urlString as NSString)
            DispatchQueue.main.async {
                completion(image)
            }
        } else {
            DispatchQueue.main.async {
                completion(nil)
            }
        }
    }
}