GPU throttling?

My game's GPU seems to be overworking itself, causing my game to have occasional framerate drops. This throttling does not happen on all projects or if I set my Control Panel > Power Options to balanced, but when I have it set on high-performance (which I usually do), it throttles itself and causes the framerate drops. I'd like to know what to optimize to fix this GPU throttling. Here's what the profiler says at the spikes:

CPU:

GPU:

Any help is appreciated, thank you :)