No. That can not be it. The screenshot shows that the CPU usage is 50%
If that value is total usage it is meaningless. That is value that shows what if application could use infinite amount of threads and use all cores of your 8-core. Any games 1-3 threads dominate. You must examine usage values of individual cores.
Exactly this. The total CPU-usage is just an average of each CPU-core's usage; if any individual core is close to a 100% load, then that's a CPU-bottleneck, regardless of what the average value of all the cores is. Personally, I always just disable that overall CPU-usage value in Afterburner's OSD, since it's basically useless, and just enable each and every individual core.
