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Performance notes

• initial grid as a function input is very important to take stress off naive memo with JSON stringify hash
• at 50x50, rendering appears a bottleneck; bypass calcudata? (object structure poor)
• stream data to vega, or render to canvas or css grid? (with animation?) (somehow vega svg faster than vega canvas and I think FF faster than chromium)
• memory usage is out of control: manually try memo eviction strategies