Performance protocol guid that also acts as the performance HOB guid and performance variable GUID
Include/Guid/Performance.h

GUID Information

GUID's Guid Name	GUID's Guid
gPerformanceProtocolGuid	{ 0x76B6BDFA, 0x2ACD, 0x4462, { 0x9E, 0x3F, 0xCB, 0x58, 0xC9, 0x69, 0xD9, 0x37 } }

Refer to Header File