PIX is a performance tuning and debugging tool for game developers. Previously, it was used for Xbox console game development.
Timing Captures help you understand the performance and threading of all CPU and GPU work carried out by your game.
Function Summary Captures accumulate information about how long each function runs for and how often each is called.
Callgraph Captures trace the execution of a single function.
Memory Allocation Captures provide insight into the memory allocations made by your game.