Unfortunate wording in the title. The price of Bitcoin "crashed" as in plummeted, and the Chivo wallet system they're trying to use in El Salvador "crashed" as in went offline. The Bitcoin network, of course, chugged merrily along, at its usual 4 or so txns/second.
Is it still 4 txns/second even with the Lightning network?
Nobody uses side-chains, so I don't think their capacity is the interesting number.