atlas use bittynimble install bitty
This library has no dependencies other than the Nim standard library.
This library gives you 1d and 2d bit arrays and operations to perform on them.
If you have type like seq[bool] in your code, switching to bit arrays should improve your memory usage by 8x. Using tightly packed bit arrays can also improve cache performance if you are doing a lot of sequential read access on a large amount of bits. But tightly packed bit arrays can also be slower if you are doing a lot of random write access. Always measure!