Upper size limit of CKB

You can check this one first:

For right now the basic size of a Cell is 61 CKByte, so we can contain many users right now. And for a UDT(User Defined Token) cell, it would be 100+ CKByte, but you can use this cell to store a large number of one UDT.

And we believe that the most important thing about layer1 as a global consensus is that it is decentralized and secure, which means it will be slow and expensive. For smaller transactions and partial consensus can be implemented with infinitely expandable layer2.