I find it amusing that many corporate dev teams picks C++ for its performance / low levelness, but then reject any code that Casey's advocate for. It is extremely hard to convince them to consider these things (ie in this case cache misses and branch mispredictions).

Now, if we consider only a conservative 2x speed-up, I might not care if my app starts up in 2s or 4s, but I do care if my device's battery last for 20h v 10h.