You're right, of course. What I meant to say is I was significantly below 100% (around 80) on every single core. Therefore I really thought it couldn't have be

You're right, of course. What I meant to say is I was significantly below 100% (around 80) on every single core. Therefore I really thought it couldn't have been a CPU bottleneck (since one would assume it could have scaled at least another 10% on every core, but in the end it was.