HTTP - Persistence vs Non-persistence

A web page has 10 reference objects—how long does it take to load them all?

Non-persistent HTTP (sequential)

1. 1 RTT for TCP connection
2. 1 RTT for base web page
3. 2 RTT * 10 for each object (consisting of new TCP connection and HTTP request)

Total: 22 RTT

Persistent HTTP

1. 1 RTT for TCP connection
2. 1 RTT for base web page
3. 1 RTT * 10 for each object (only consisting of new HTTP request)

Total: 12 RTT

Non-persistent HTTP (5 objects in parallel)

1. 1 RTT for TCP connection
2. 1 RTT for base web page
3. 2 RTT for objects 1-5 (parallel creating new TCP connection and new HTTP request)
4. 2 RTT for objects 6-10