Prcek just to add some background information to this statement.
Flarum, for the most part, is very performant. There might be some edge cases where perfomance might still be impacted, but once reported we always do our best to patch issues as soon as we can.
Aside from that, from my experience, it's usually community extensions (or the amount or a certain combination) that is detrimental to the performance. In our hosted flarum stack (on azure Kubernetes) we monitor these outliers, report and usually contribute patches. Regardless, this is an ongoing activity considering new and updated extensions.
Perfomance will always be a key area for core and your help in identifying extensions that can be optimized is crucial in guaranteeing a healthy Flarum ecosystem.
