Why Direct3D application performs better in full screen mode?

Question

The performance of a Direct3D application seems to be significantly better in full screen mode compared to windowed mode. What are the technical reasons behind this?

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Answer 1

Basically, the video hardware is completely dedicated to the exclusive mode application.

There is no contention for video resources (pipeline, texture memory, etc...)

In particular, texture upload can be a big bottleneck. The less you have to do it (because you have it all), the better.