Sure. He often benchmark some small C++ code on his "laptop" CPU (which one exactly? microarchs matter!) and then committing classic microbenchmarking pitfalls

Sure. He often benchmark some small C++ code on his "laptop" CPU (which one exactly? microarchs matter!) and then committing classic microbenchmarking pitfalls such as: - benchmarking something small enough to inspect machine code, but not inspecting machine code - not plotting distribution, average, variance etc - no attention paid to CPU frequency governor settings - measuring too short a run - measuring too small a dataset that it fits entirely in L1