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Optimization Notes

1. For huge lists, create list of defined size, or low level array.

var list = new List<Foo>(99999999);
var arr = new Foo[99999999];

2. Do not use IndexOf() as it searches the item index using algorithm with O(n) complexity

3. Assume there is a huge listSource IList.

INSTEAD OF THIS:

var listToBeCreated = new List<Foo>();

listSource.ToList().ForEach(item => listToBeCreated.Add(new Foo(item.bar, item.tar, item.zar)))

USE THIS:

var listToBeCreated = listSource.Select(item => new Foo(item.bar, item.tar, item.zar));