Currently, we do not plan to introduce random events on every map, although the list of locations that do feature them may expand in the future. Also, we are currently prioritizing integrating random events into Random Battles because it is the core mode of the game. In the future, we may implement random events in other game modes.
We are aware that random events may be a strain on some lower-end systems. By the time they hit Random Battles, we will address this by optimizing their use of system resources on any hardware and adding their versions for lower-spec systems that will be less demanding on performance but the same in terms of gameplay.