At what point does using a StringBuilder become insignificant or an overhead?

Question

Recently I have found myself using StringBuilder for all string concatenations, big and small, however in a recent performance test I swapped out a colleague\'s stringOu

Answer 1

There's an interesting article on this over at Coding Horror. Jeff got the following results for 100,000 iterations on a dual core 3.5 GHz Core 2 Duo:

 Simple Concatenation    - 606 ms
 String.Format           - 665 ms
 string.Concat           - 587 ms
 String.Replace          - 979 ms
 StringBuilder           - 588 ms