I recently upgraded my iMac from SL to Lion and did the normal upgrade but am having lots of performance issues. I have the current hdd cloned to an external and also have a TM backup. If I do a clean install of Lion and then migrate my files from the clone or TM backup will it migrate only the data and apps? I don't want to add back in whatever is left from the upgrade. I just want to know the proper way to go about this.