There is a mismatch. What is ideal for (web browser) HTTPS is a single encryption handshake used by multiple parallel, independent transfers. So if a chunk of

There is a mismatch. What is ideal for (web browser) HTTPS is a single encryption handshake used by multiple parallel, independent transfers. So if a chunk of your PNG is delayed, that doesn't stop your stylesheet from loading, or vice versa. I.e. multiplexed encrypted connections.