Можно ли одновременно добавлять множество элементов в большой список?

Yes, in Android, you can add multiple items to a large list simultaneously using methods that allow adding a collection of items in a single call, such as addAll() on ArrayList. This is more efficient than adding items one by one, as it reduces the number of operations and can improve performance.

Example:

ArrayList<String> bigList = new ArrayList<>();
List<String> newElements = Arrays.asList("one", "two", "three");
bigList.addAll(newElements);

If dealing with UI-related lists, such as RecyclerView.Adapter, it is advisable to use methods that notify the adapter of batch changes, like notifyItemRangeInserted(), to avoid unnecessary redraws.