Using performSelectorInBackground to load UITableViewCell image in background, performance <p>I have a method for loading images for UITableViewCell in the background. I use performSelectorInBackground. The problem is these threads are finishing and loading images even though they may not be on the screen anymore. This can be taxing on resources, especially when the use scrolls quickly and lots of cells are created. The images are fairly small and being loaded from the disk (sqlite db), not from a URL.</p> <p>I've put code in the cell to check to see if it's the most recently displayed cell and I don't load the image if it's not. This works, but it's still creating the threads even though the "expensive" work of loading the image from disk isn't being executed unless it's the most recent cell.</p> <p>The question is, what's the best way to deal with this? Should I kill existing threads each time the UITableViewCell is reused? How do I go about killing threads invoked by performSelectorInBackground?</p> <p>Any other suggestions on how to handle this are appreciated.</p>