It is a WordPress multisite management plugin and with it, you can create up to 300 subsites and run a successful passive income business what you need to do is work for once and earn from it forever. Also, you don't need to care about its speed as it has no bloating.
Note: It is not a perfect tool and has some features missing compared to similar products but it is a good tool at this price as all the similar tools which I saw are subscription-based and expensive.