Ok lovely people. I cleaned it, and I even did a similar thing to João’s 
'dynamic patching' to see if it would be faster. In my case, it is unusably 
slow for 300x400 for the struct version, and it beachballs completely with the 
‘dynamic patching’ approach.

Even more funny is, if you save the patch once it is drawn, the file is now 
huge and cannot load ;)

I’ve included both patches for 30x40 for fun. At that size they both work 
relatively well. Now, change the numbers to 300 and 400 for less fun :) Any 
pointers to optimisation and/or other ideas welcome

p

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