My Witcher 3 benchmark scores are inconsistent and throughput is fluctuating. How do I quantify the bottleneck?

Running the Next-Gen version of The Witcher 3 on ultra settings, my Galax chipset was sitting between 60°C - 66°C. I noticed controller load peaks of 0.3s - 0.5s that caused the throughput to jump, making the benchmark curve look like a saw blade. I first tried messing with the queue depth in my disk read/write tools; the speed went up, but the stability was still trash. I then used a GPU benchmark to quantify the system bottleneck and found a timing conflict between the CPU scheduling and the storage response. A single test just wasn't giving me the full picture. My second move was enabling Re-Size BAR in the BIOS, and suddenly the throughput curve became way more consistent during rendering tests. I still had some minor fluctuations, so I had to tweak the power strategy to 'High Performance' to kill them off. This kind of benchmarking is a real grind. Quantifying bottlenecks is a complex process. I could feel the VRMs pulsing under high-frequency instructions, and the keyboard response felt sluggish when the frame pool dipped. Eventually, the rendering validation confirmed the bottleneck data was accurately exported. It took a few tries, but the results are finally reliable. This is a solid reference for Galax users.