PerfLog,what is it meaning?

PerfLog,what is it meaning? This word strares w____ M.Guess what it is. what is this ?A:(this is M )B:(it is M) What colour is it? what time is it what time is it? it,is,what,time? what colour is it? what is it? what it is what is it what color is it what is it over what is it like? What color is it What is it What is it. what color is it