I just read the part of the docs that explains streaming and suspense in regards to the loading.tsx page, and, if I'm correct, they allow components to load in parallel to reduce the various loading thresholds. The thing I'm confused about, however, is whether or not loading.tsx in the App Router automatically handles this for me or if I'd have to manually set it up. I'm aware that manual setups work; I'm just wondering about the automatic part.