I came across a very well written and detailed breakdown on how to optimize your C++ code at this page.
This is certainly relevant for us, as we currently have some performance issues with our grid.
In short term, the C++ section is by far the most interesting, even though it’s strictly not only C++. It covers many details regarding computer performance in general, and gives tips about performance from before a project is started, and how not to waste users time.
But it’s technical. Very technical (which is a good thing). It might not be for Programming 101, but rather professional software engineers and architects with experience.