Is Graphisoft actively doing anything about the shocking graphics & input lag of ArchiCAD 27?

[Paul King]

Under Windows 11, using a pretty high end Workstation with high end GPU with lots of gRAM, with even small residential scale projects, ArchiCAD 27 is still an absolute dog to use performance wise compared with earlier versions.

I could perhaps understand if this was a beta, or maybe a first release, but this issue has persisted through several updates.

Performance seems to get even worse when zoomed in, in both plan and 3D.  Sometimes literally seconds of lag occur - for example when holding shift while selecting (to constrain movement direction). in reasonably simple contexts without lots of objects on screen.  Hotspots are offset from actual geometry in 3D when zoomed in even moderately close,.  in 2D windows, black linework visually thickens and changes colour to red depending on orientation - harking back 30 years to the the way lines would change appearance on old NTSC CRT monitors.

etc

Windows Task Manager often shows minimal CPU utilization while these lags are occurring, so my semi random guess is the bottleneck is in utilization of the GPU (despite its high specs) and is something to do with a poorly optimised OpenGL implementation

My reseller advised months ago that Graphisoft was aware of the issue - but things are still no better three versions/hotfixes later.   

Have GS lost most of their developers or just lost interest?

[Johnva]

I think you are right. I have a rtx 3080 and I have the same issues. When I scale the Archicad window to a smaller scale on the screen it fixes the issue.  And trace is also a no go for me. 

I have also found that closing certain apps helps too. I also found out that while using the windows phone app, it also has issues. 

twinmotion has a similar issue in 4K. If you run twinmotion on a 2k or FHD. It’s buttery smooth. 

I am considering going to a 2k dual setup now because of this issue. 

[Kelly at Kanvi Homes]

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The issue is really exacerbated with trace reference on in 2D - with even very simple models in foreground and simple 2D line drawings as the reference in the background.

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Trace is not useable for us anymore with the amount of lag. And we're only tracing basic 2D linework from a worksheet, everything else in the trace is turned off.

[Paul King]

Twinmotion is absolutely fine for me on dial 4K monitors - just ArchiCAD seems to have the issue for me.  And it seems to have become worse in 27 than earlier versions.