The developers of the draw-and-paint app Procreate have released an update for the new Ipad Pro which, among other things, increases the maximum number of layers in an image, from 91 on the 2018 and 2020 Ipad Pro models to 115 in the new models with M1- processor.
But as attentive users have noted, the models of Ipad Pro with one or two terabytes of storage, which have 16 gigabytes of memory, should be able to handle more layers than the models with 256 or 512 gigabytes of storage, which “only” have 8 gigabytes of memory.
The developers of the app have explained why: Ipad OS limits how much memory an individual app can use before the system forcibly shuts it down, and on the new Ipad Pro the limit is the same regardless of whether your toad has 8 or 16 gigabytes, reports 9 to 5 Mac.
This means that those who use the iPad with only one professional app at a time lose some potential in the M1 chip. If the eight gigabyte model can spare five gigabytes for an app, leaving three gigabytes for the rest of the system, the 16 gigabyte model should reasonably be able to spare 13 gigabytes for an app and still have the same amount left.
Unlike Mac OS, iOS has no system for moving unused memory to disk and then reloading it when needed (so-called swap files). This means that the system must end other processes to free up memory if an open app requires it. This is why Safari on iOS often needs to reload tabs you have in the background, which does not happen on Mac.