arrays

Wich is the fastest way to add / remove items from a one dimension array? (even if adding or removing them from the middle of the array)

do you mean inserting into an array so that the array expands and removing so that the array shrinks? Or do you just mean overwriting the value with a valid one or with 0?

If you adding/removing/inserting it might be a better idea to use a linked list (check out TList and TLink) because they are made to be able to do that better than a normal array. But if you really need to you can try using slices (see the docs). Hope it helps.