Hello Paintstorm crew, i have had this problem with Paintstorm studio for a while and as i heard it bothers more people (Borodante's review for example).
The problem is with the maximum brush sizes. Now I understand that some brushes lag a lot when people increase their size to maximum, but that problem doesn't include the Airbrush for example, and so it's very hard to work at bigger resolutions for production, anything over 4000px wide really (or even 3000px). I find the feature to increase brush size limit absolutely crucial and not just for me, but many other people. I've waited for patch 2.0.3 whether that gets fixed or not and seeing sadly how it's not i found myself having to write this topic on forum.
I've been very happy with Paintstorm experience, it's an amazing program you guys are developing, keep it up. Hopefully you guys fixed the white screen after autosave bug, going to test that myself soon, if not, please note that one as well, it can be very flow-disturbing bug.
Thanks in advance!