Disable "Realistic Rendering" in the Toolpath Simulation window. Use "Shaded" mode. This forces the software to use legacy OpenGL, which is faster on modern graphics cards.
Despite being an older version, ArtCAM 2011 is favored by many for its compared to some later, more complex iterations. It remains a top choice for "artists rather than engineers" because it translates 2D artwork and photographs into 3D reliefs with minimal technical friction. Creating 3D CNC Signage in ArtCAM Pro 2011 artcam 2011 64bit top
The “top” performance is visible when working with high-detail vectors. ArtCAM 2011 64-bit introduced improved vector Boolean operations. You could now import large DXF or AI files with thousands of nodes and still rotate, zoom, and edit in real-time. and edit in real-time.