Please post new questions as a new topic.
Do not just reply to an existing post with a new question.
Also please try to post in a relevant section of the forum - read the section descriptions.
I have split and moved your post.
It could be for all sorts of reasons.
What version of Archicad and what build is it.
What license type do you have?
What is your operating system?
What are your machine specs?
Does it happen in all files or just one?
What are the steps to reproduce the problem - are you working in 3D or is it just sitting idle?
Is it affecting just the 3D view or is all of Archicad freezing?
The more information you can give, the more we can help.
Barry.
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