which one is slow? Gnome shell, my hardware, or Fedora?!

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http://forums.fedoraforum.org – Hi, I searched a lot! I mean I read every single post about Gnome-shell slowness in the world wide web!!! but I couldn't find my answer. I have this problem too. Gnome-shell responses very slowly to switch between different applications. now, I have 5 windows open: totem, firefox, terminal, and two nautilus. I'm typing here, in firefox. when I hit the super key, and then I choose firefox, there is no lag. but if I choose another window, there will be a lag. an annoiyng lag! and then if I hit the win key again, and choose the same window, there is no lag, but choosing another window produce (HowTos)