What causes delays or failures when scrolling images in a slideshow?

Delays or glitches when scrolling images in a slideshow on iOS can be caused by several reasons:

• Loading images from the network without preloading or caching, which causes delays in display.
• Using large images without optimizing size and format, increasing decoding and rendering time.
• Performing heavy operations on the main thread, such as decoding images or complex processing.
• Lack of or incorrect use of cell reuse mechanisms (e.g., in UICollectionView), leading to frequent loading and rendering.
• Improper memory management, resulting in frequent garbage collection or crashes.

To improve smoothness, it is recommended to cache images, load them asynchronously, optimize size and format, and perform heavy operations in a background thread.