[rothbardrand]

It's less transactions. Imagine you're paying your cable bill.. you can move some value to the side chain (one transaction) then make 12 monthly transactions-- on the side chain, so off the main chain--and then after cancelling move the balance back to the main chain (second transaction)

Thus 14 transactions become 2.

[kobeya]

The amount of on chain transactions supported by a global mining network is fixed. You can’t just keep adding side chains or else you will run into the same scaling limits.