Adventures in Dolphin: The Tale of the Fucked up CPU Usage

[Kurausukun]

Inspired by the progress report and video, I wanted to try running Majora's Mask with the CPU overclock since, for whatever reason, it never occurred to me that I could fix GC Majora's Mask's terrible framerate issues with this. At first, all was well; I was running at 100%, stable 20fps, everything. I walked into East Clock Town and marveled at how it maintained its framerate. However, it did not last long; the game started randomly slowing down, completely independent of what was going on in-game. I was literally waiting at the platform outside the clock tower waiting for the night of the third day, and at times I was running at 100%, and at other times I was down to 60%. I opened task manager and monitored my CPU, and found that for some unknown reason, my CPU usage was steadily climbing and then randomly going back down. It would start at around 5% usage, then it would start climbing to around 10%, and then it would start slowing down ingame, and then it reached around 25%, stayed there for a while, and then randomly went back down to 5% and the lag cleared up. I wasn't even running anything else; I have no idea how this could have happened. My overclock was 128%, and I was using the widescreen code. What exactly should I be investigating here?