I wrote a quick script to implement the iteration procedure in Conway's game of life. It works much slower than expected; even computing a 10*10 grid causes a noticeable pause. In fact, if you run the project, it doesn't need a "wait" block because the time to calculate the new grid is so great.
I have tried wrapping the computation in a warp block, which helps somewhat but doesn't resolve the issue.
Thanks for the suggestions! These sped up my code quite a bit.
One question: how did you implement 'sum'? I'm assuming it's a custom block because I couldn't find it in the preset blocks or in any library. I ended up using the APL primitives library for this.