How to speed up collision in manual retopology for 3D models?

When manually retopologizing 3D models, using a simplified proxy mesh for the source geometry or reducing the source’s polygon count speeds up collision detection. - A proxy mesh (lower-poly version of the original) cuts down on faces the software checks for overlaps, while still letting you reference the original shape. - Adjust collision distance to a moderate value—overly tight settings cause frequent, slow checks during mesh drawing. - For high-poly scans, decimate first (preserve key details) or use built-in tools (like Blender’s Retopology workspace proxy) to auto-create a lighter collision mesh. This keeps your workflow fast without sacrificing retopology accuracy.