How do you stop the spinner/load jank hell of 100 different components all requesting their own data? Not to mention, even if you're running a low traffic site

How do you stop the spinner/load jank hell of 100 different components all requesting their own data? Not to mention, even if you're running a low traffic site so your backend performance is fine, the browser is limited to a set number of concurrent requests. Locally, it might all go super fast, but as soon as you deploy it, that dashboard calling 30 endpoints is going to feel insanely slow just waiting for the network to become free for use.