Although in iOS 12.2, Apple addresses a bug in storage, such as the incorrect storage bar graph in category (Settings > General > iPhone Storage where the storage size of some large apps, the System category, and the Other category), there is no enhancement for the ability of clearing cached files to improve the storage space. The slow performance of iOS device is usually caused by app cached data.Caches are data or files stored on your iPhone by iOS apps. These files are stored so that the next time apps want to run, and they can easily access these data or files without having to create new ones again. Caches lead to speedier and optimal performing iOS apps, but they can clog your iOS storage space thereby leading to slow performance. This is the major reason why app caches must be erased. Crash log is one of them.Click here to know how to remove crash logs.