If you found related topics, then you know that you have not provided any information that will help anyone to provide you with a solution.
Post your version of AC, your OS, computer specs, video driver specs, and perhaps even the result of running Polycount (download from Help > Goodies) on your file...
Karl
One of the forum moderators
AC 28 USA and earlier • macOS Sequoia 15.2, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB