Higher print speed makes sense for higher strength as it makes the layer to layer bond at a higher temperature - there is less time for cooling between layers. Running the extruder hotter will also help make parts stronger for the same reason. Unfortunately there are down sides to printing fast and hot. The optimal settings are design dependant. What works best for a tensile test piece, won't necessarily work best for a frog or a cellphone case. Annealing sounds interesting but I suspect that unless your parts are flat, higher temperature annealing will make parts droop.