I found that in my late 30ies I shifted from an exhausting DFS to a BFS mode....and it has surely helped in tackling social and work complexities better. I have also discovered that I was unconsciously not giving my full attention to details ,especially over math/programming problems, I was always in a state of slight 'haze', but the whole thing was extremely well played by the brain...I really thought I was fully concentrated and paying complete attention, but only now I know that I can step to a deeper level, where I play back and forth multiple variables and remember better the connectivity of the problem. A decent analogy would be if you play piano and are going through a challenging part, your hands and mind are fully focused on the movements but doing so makes everything hard and stiff, and eventually you run out of steam very fast, with experience though you learn to microfocus on some parts and keep it loose on others...etc. seems fitting..