Geometry Nodes evaluation and UI thread responsiveness

Procedural Evaluation Blocking

Blender's Geometry Nodes system utilizes a dependency graph to update mesh data in real-time. When executing complex procedural setups—such as high-iteration duplication or dense point cloud generation—the evaluation process can heavily tax the system resources.

Because the main thread often waits for the modifier stack to complete its calculations, there is a risk of the user interface becoming unresponsive during the evaluation of heavy node graphs.

While the Escape key is documented as a method to cancel certain long-running operations, the effectiveness of this interruption varies depending on the specific node operations being processed in the C++ backend.

• How does Blender handle the interruption of a Geometry Nodes evaluation mid-process?
• Is there a mechanism to prevent the UI thread from freezing during high-density procedural generation?