As the title says.

I've personally never had any performance issues after running it on a live server with over 100 people for months on end. Nor have I received any reports about it affecting performance. Though I wouldn't rule it out as a possibility. If there's an excessive amount of explosives being used on the server then it could potentionally cause some server latency issues due to how the plugin tracks the data. Since I've received no reports I'll say this plugin shouldn't concern you in regards to server performance.