Cache Components bring back one of the fundamental insights and Ws of Pages Router. In Pages Router, data fetching confronted you with an explicit choice: to 𝚐𝚎𝚝𝚂𝚝𝚊𝚝𝚒𝚌𝙿𝚛𝚘𝚙𝚜 or to 𝚐𝚎𝚝𝚂𝚎𝚛𝚟𝚎𝚛𝚂𝚒𝚍𝚎𝙿𝚛𝚘𝚙𝚜. Now, <𝚂𝚞𝚜𝚙𝚎𝚗𝚜𝚎> or "𝚞𝚜𝚎 𝚌𝚊𝚌𝚑𝚎" is your choice, prompted by an error when you do dynamic I/O. The most delightful "error" of all time, if you ask me. It's an error that makes you or your agent choose. What's more, gSSP had a fatal flaw: no instant 'loading' state to navigate to. Using <𝚂𝚞𝚜𝚙𝚎𝚗𝚜𝚎> gives you the opportunity to set a 𝚏𝚊𝚕𝚕𝚋𝚊𝚌𝚔={} (or 𝚕𝚘𝚊𝚍𝚒𝚗𝚐.𝚝𝚜𝚡). Combined with single-roundtrip data fetching and streaming, I believe this achieves the pinnacle of performance. We're so back.