Thanks @bo27 and @rrrr.
I was actually looking for that setting in Windows7, but the whole system preferences in Windows are so incredibly hidden and convoluted… truly aweful.
So thanks to your replies I found the DPI settings.
Turns out neither settings were ideal. It was set by default to 150% which looked really bad in vvvv.
100% worked fine, but of course was really tiny. It might come in handy at some point though.
I tried 200% (2x 96dpi) which was nice in theory, but again Windows f**ks this up so badly. Most of the UI elements are looking good, but then some text like in the titlebar are just unusably large.
So in the end 125% seems to work nicely. Its the equivalent to sth like 2200 x 1440 px on 15", which is quite a lot, but gives me a large space for a couple of vvvv windows. As there is no zooming in vvvv, that is quite nice.
The text also appears to be fine at DPI settings of ANYTHING BUT 150%.
ps: yes, totally agree rrrr. would be so nice to get with the times and have vvvv on mac with openGL, openCL and what not. DirectX and the whole 3d rendering is a bit of a joke really. Even the best examples remind me of stuff from the 90s demo scene.
I played around with quartz composer a bit, but somehow it lacks the basic building blocks and simplicity of vvvv.