It can handle a few millions entities in real-time.
And it is fast enough to do set intersections and unions.
These are most common operations in a game.
And attaching tags to objects is common too.
Relations like `A loves B` are also tags.
I.e. A is in a set of objects that love B.
In any case, order of magnitude better than what I had before.
That is, I used all 64 bits to store just a single bit.
Symta exposes it as a generic hashmap.
And it is auto promoted to a normal hashmap,
As soon as one of the value is not 1 (0 = No value).
Think https://en.wikipedia.org/wiki/Numerical_tower
But for hash maps.
Bitmap is the most basic of these.