I don’t really see what “continuous profiling and optimisation” has to do with your code change here. 68% of your cpu time is spent computing SHA256? That’ll pop out as a hotspot using any competent profiling tool. It doesn’t matter what tool you use, or what approach. It just matters that you look, at all.

I’m not saying your special profiling tools are bad. But I can’t tell what’s special about them when they’re simply doing something you could do using literally any profiler.