The performance gain that can be achieved thanks to parallel disk I/O can be spectacular. This allows working with huge images in PixInsight. For example, with one or two fast SSD drives configured for parallel swap file storage, you can work with a 32-bit RGB image of 1200012000 pixels and perform undo/redo operations in real time. Note that parallel disk access is at least as fast as RAID 0 storage, although much more flexible and much easier to configure and maintain.