Cache locality

[WinstonHartnett]

Using boxed arrays leads to fragmented addresses, reducing cache performance.

I could:

• Ignore the problem until it really hurts
• Implement some kind of jank compaction scheme (probably using compact)
• Force almost everything to be Unboxed or Storable
• Use a serialization library? How bad could serializing/deserializing be?

Question: how do other ECSes in GCed languages deal with boxing?

[WinstonHartnett]

The only way to control boxed memory layout (AFAICT) is to use compact, which is immutable. Maybe provide a Compacted component storage type for long-lived [mostly] read-only data?