It is now possible to select drawing method of choice. Of course some minor fixes and improvements are also included.
With Qt 4 it is relatively easy to render the image in several ways. Depending on platform, drivers and hardware the performance may differ a lot --- "5x faster" would probably be the sticker on the box, if you catch my drift. After letting this stew in svn for over a year I decided that I won't find any acceptable way to auto-select rendering method, so now it is released as a user selectable option requiring "save settings" and restart of the program... User friendly it is not.
I tossed in a pre-compiled version for 64 bit ubuntu 10.4, in case somebody is as lazy as I am and on a platform which happens to have compatible libs. Maybe more platforms will follow, but I doubt I'll package anything properly.