I had the same issue on my brand new laptop on Windows 7 64 bits.

The "interf_u.brd" took many seconds to display or refresh. We can see the 
lines draw one by one.
I tried different binary versions, with the same problem 
(KiCad-2010-03-14-SVN2456, KiCad-2009-02-16-final, kicad-20080825).

Like you I tried on virtual machines: XP and Linux 64. And here, despite of 
virtualization overhead, the same test is responding instantly (so for me this 
is at least 50 times faster!)!

After this I found a very simple "turnaround" solution: go with explorer to 
pcbnew.exe, click "properties", and check "unactivate desktop composition" 
under the compatibility tab.
With this the speed becomes from unusable to acceptable, but not as smart as 
under the linux or XP VM.

So this acts as a conflict with the new display system of vista/win7.

Hoping this little information might help you and other people that will face 
this problem.

Greetings 
Ben.


--- In [email protected], "o00batman00o" <anthony.siegr...@...> wrote:
>
> Hello
> 
> Since I upgraded to windows 7, I can't use pcbnew beacause the screen refresh 
> is amazing slow. I can see dot grid showing up from left to right. I notice 
> the same behavior on all PC running Windows Vista or 7.
> 
> My temporary solution is to run Kicad under Ubuntu via VirtualBox. By this 
> way refreshing rate is in my opinion 10 times faster.
> 
> Does someone noticed the same issue? Is there a solution ?
>


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