Check this out:
“and add 2 units if you’re on a personal plan (so that you can see how it would work on a professional plan”
Focus on optimising your app as much as possible before thinking on capacity. Because a lot of the performance issues that are mentioned around this forum are often related to non optimised creations.
You need to design for bubble. Know how Bubble works and exploit that. There are a lot of forum posts on optimisation. Some of them where Bubble developers have been very active and providing constant tips.
You will appreciate it. Your users will appreciate it. And the Main Bubble Cluster will also appreciate it