Laggy geometry window

[Hbasm]

Hello, I'm a long time Wings3d user (love it for more than 10 years) and I just updated from version 1.5.3 to 2.x ... BUT the interface has become very slow now. It takes about 1 second every time I right-click before a menu pops up (drives me nuts) and I can literally see the menu is being drawn, line by line. Also, moving the camera around even a default cube primitive is slow and jerky...

I'm on a Windows 7 x64 computer with a fairly old, low-end graphicscard. That may be the main reason, but it never used to be a problem, nor is it a problem in my other 3d apps. The old Wings3d interface was super responsive, so I guess, I will have to stick with 1.5.x for now.

It would be nice to be able to switch back to the old interface in user preferences, but I do understand if that would be a big mess to reimplement. I just don't like it when things degrade, and this seems like a degration... ;-)