My computer is snappy at default settings/overclocked settings. When I change my BIOS settings and start up my computer, everything is initially fast. For the first few minutes everything is good and then it starts to noticeably slow down. If I change the BIOS again (just any setting) and start up the computer, everything is fine again. I have a good computer and I'm not sure what it could be. Could someone please help me? Thank you.