The Tactical Processor has been a mystery ever since its implementation. What exactly does it do? The community has been asking for years and Square Enix has finally provided some information as to how this attachment functions.
This attachment is a bit different than the standard attachment that, for example, gives XX% increase in attack, defense, etc. The automaton periodically checks the information around the automaton and decides its next move (if HP took a hit, it will cure, if TP has been saved up, it will perform a WS, etc.).
When using the Tactical Processor the frequency of these checks is increased and allows the automaton to respond to variations in its environment quicker and more precisely.
However, every time it performs a check, the overload value increases, so as the frequency of checks increases it will increase the possibility of an overload.