I've updated the SDK after quite a while and was pleasantly surprised by the GUI tool window. Very nice!
However, I experience very slow rendering now. With the old SDK my (very simple) test app was running at >2000fps on my PC. With the new SDK it runs at frame rates between 3 and 60fps, depending on which hardware profile I choose (only MBX lite works at 60fps, everything else is much slower).
The CPU usage is very low, so I don't understand why the frame rate is that low.