How about using glob as a generator? Would that reduce the gap beteen the os.walk and glob? Because in your code, glob() loads everything into memory and that may adversely impact the runtime.

At 5:29 why is there so large gap for both like glob went straight from 3.85 to 1.62 and os.walk went from 1.9 to 0.8, like almost half? Then again goes up then again down? I myself had encountered such issues, the python script sometimes take long, then instantly when I run it again is faster