Dual Monitors & DirectX Slowdown Bug

[Paul King]

How many others get massive editing slowdowns when driving ArchiCAD 11 with dual monitors?

ArchiCAD 11 works well for me with 2 monitors IF and ONLY IF the second monitor is first deactivated in the driver software before starting ArchiCAD.

Once ArchiCAD is running, I can reactivate 2nd monitor again and everything works very well. I can even expand OpenGL ArchiCAD windows across the two screens & navigate and edit in 3D and the software does not skip a beat.

If I launch ArchiCAD with both monitors active however, the DirectX generated overlay ArchiCAD uses to give visual feedback during editing slows down to a crawl in 3D OpenGL windows - so an operation normally taking a fraction of a second now takes several seconds to respond with feedback, even on high end hardware - making ArchiCAD virtually unusable.

Can anyone on PC run AC11 on dual monitors without this problem in 3D windows? If so, what hardware and graphic driver version are you using? What screen resolutions?


(Whoops! - I voted "No", when I should have votes "Yes" to my own question! - ignore that result!)

[Paul King]

Sadly, Graphisoft still have not addressed the issue with latest hotfix.
Only workaround is to lower screen resolutions which helpsa bit, or to set up a monitor profile (with desktop short cut) that deactivates the second monitor while ArchiCAD is loading - and another one to re activate it once ArchiCAD has finished loading.

Clearly a Graphisoft problem (which I have reported), but no obvious sign of interest from Grapihisoft so far - possibly they think dual monitors are rare enough not to support...?

[Rod Jurich]

No problem with my 2x24" Dells Paul, but I'm on Mac.
So wont spoil your poll by voting no
How long does it take to open AC?

[Paul King]

I am running 30" + 20"(portrait mode) Dell monitors at max resolution

Doesn't seem to be specifically a windows O/S problem per se, though ArchiCAD does not seem to be as well implimented on windows in this case.
Everything is fine so long as ArchiCAD thinks there is only 1 monitor during loading. No issues with other Apps at all. Loading AC is fairly quick, depending on libraries.

Cheers