Random Lag While Gaming

[MasterMarkVGC]

I've been having a slight issue with Dolphin for some time now. For most games I play everything runs very well at near flawless game speed and very good graphics. However, while playing I've been experiencing a big drop in performance where the game slows down and begins to lag for about 60 seconds and then returns to normal speed. I'm not sure what's been causing this momentary lag and how to fix it. I've attached the details of my computer specs and Dolphin settings.