[barbegal]

The first blog post only seems to suggest a 10 times speed up.

"A simple Ethereum transaction (to send ETH) takes ~110 bytes. An ETH transfer on a rollup, however, takes only ~12 bytes"

But the 12 byte number makes some assumptions that will probably not be true or only be true if many transactions are made by the same addresses.

Computationally there didn't appear to be any scaling since checks still need to be made by someone and verified by other nodes that fraudulent transactions aren't in a roll up.