unfortunately not – this is a Matlab issue. I think we’ve googled and tried a lot of the “how to speed up 3D rendering in Matlab” web tips ourselves, already. If you’re visualizing a lot of tracts or stuff, maybe a different software like Trackvis can sometimes be better. Also can export electrodes with the Tools -> Export function to .ply format and visualize that e.g. using Blender, 3DSlicer or SurfIce (with any 3D viewer I think)..