It could be you machine specs.
These are the Graphisoft recommended specs.
I have highlighted where your mahine may be struggling.
Not sure about your video card.
Barry.
Windows
Operating System
Microsoft Windows
XP, Vista or 7 (32-bit or 64-bit)
64-bit system is recommended.
Note: ArchiCAD 15 was tested by Graphisoft on Microsoft Windows 7 Professional, Windows Vista Ultimate, and Windows XP Professional. Not tested editions differ in features that do not affect the correct functionality of ArchiCAD.
Other Software
QuickTime 7 or later and Java 1.6.0 or later are required.
Note: ArchiCAD installer will automatically install QuickTime 7 and Java 1.6.12 if they are not present on your computer.
Required Hardware
Intel Pentium 4 or higher required
Note: Multicore processor is recommended to exploit ArchiCAD 15 performance capabilities. Read more about this topic
Memory and Disk Space
With 64-bit system: 3 GB RAM is required, 6 GB RAM or more is recommended.
With 32-bit system: 2 GB RAM is required, 4 GB or more is recommended.
5 GB free disk space required for a full installation of ArchiCAD.
Additional 10 GB hard disk space required per project for work with complex models and 3D visualization.
Display
Resolution of 1024 x 768 is required.
Resolution of 1280 x 1024 or higher is recommended.
True Color display adapter is needed.
Open GL and DirectX9 compatible graphic card with on-board video memory of 256 MB or more is recommended to fully exploit hardware acceleration capabilities.
You can find a list of recommended video cards at:
http://archicadwiki.com/Video_Cards
Optional Hardware Peripherals
All major plotter, printers and digitizers can be used with ArchiCAD.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11