This paper describes a performance-evaluation system for RoboCup Soccer Simulation 2D. One of the problems in developing a team for soccer simulation is that it is difficult to evaluate the general performance of the team with a large number of games. This is because resources such as developers, computers, and the time are limited. It is also difficult to automatically repeat a game because one has to manually execute a series of commands to perform a single game. In order to develop the team efficiently, we develop an interactive system that can evaluate team-performance by assigning computers automatically to run games and aggregating the results. The interactive system by using a Slack bot makes anyone use it easily through any device with Slack app. In addition, the aggregated results are recorded on the Google Sheets, so the all team developers can share the results and check it anytime. We explain the performance-evaluation system in detail that for efficient team development.