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    <p>DTO's aren't a performance concern. I think what you are asking about is the performance implications of tiering. In particular, using an application tier between your web tier (web server) and data tier (database server).</p> <p>Generally, the implications are that latency is increased (you have extra network roundtrips), but you gain some additional capacity by splitting the load across machines.</p> <p>Another common reason (again, non-performance) that people would do that is to allow them to place the web server in the DMZ while keeping the application and database servers inside the firewall.</p> <p>Another potential reason (non-performance) is the ability to plug multiple UIs on top of a single application. I've done this on past projects with great results (where the business required it).</p> <p>Also, don't underestimate the work required to maintain an architecture of that nature. It's more work than a non-tiered solution, so only use it if you anticipate needing it.</p> <p>That being said, the use of DTOs does not necessitate the use of Tiering.</p> <p>The best description I've found of tiering comes from Martin Fowler's book, Analysis Patterns. There's a small section in the back on application facades and tiering.</p> <p>Just to reiterate the previous answer, DTOs aren't a performance concern. It's just a class without methods used to provide isolation between various parts of your application.</p> <p>I'd also suggest picking up Martin's other book, Patterns of Enterprise Application Architecture. The DTO "pattern" is documented there.</p>
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