It's more effective to do an AOE attack with a large area as they're spread out across the whole room (I guess?). Also, to increase your speed, use a fast brawler or just one that increases the speed of the brawler, like the current record. If you're going to use Jacky for her super, you should definitely center it so you can attract all of the bots and make it faster, or maybe target the sides first so you have an easier range. Make sure to run in a straight line too (applies to all speed runs). Also, the power of the brawler will also affect the timing, so make sure the brawler is maybe a power 7 or above.