Viewer: Structure-Sequence colouring

I have multiple protein structures superimposed and did some colouring of residues corresponding to each other. Next, I display sequences for those superimposed proteins and colour these sequences by the colouring I did in the 3D window. Yet, further manipulation of the sequences/alignment, for instance introducing insertions by entering whitespace or deleting them is highly laggy when one works with tens of structures (>50) at once... Apparently there's much real-time communication between the 3D window and sequence window which generates unnecessary computational load. Do you have any ideas on how to un-lag this process?