Today Krita 2.3.1 has been released. Your favourite Linux distribution might already have it available! This is a bugfix release, mainly focusing on some problems with working with large images, from 50 megapixels onwards. Note that for large images, you still need a lot of real memory.
The following issues were fixed:
Not yet fixed are the upscaling problem Ico-dY reported (this problem only happens intermittently, but we’ve been able to reproduce it and are working on it) and the broken swapfile. We’re also working on that, so there definitely will be a 2.3.2.