Oracle Oracle9i Application Manual page 52

HTTP/1.1
Shorter Response Times
Persistent connections can improve total response time for a web interaction that
involves multiple HTTP requests, because the delay of setting up a connection only
happens once.
Consider the total time required, without persistent connections, for a client to
retrieve a web page with three images from the server.
Activity
Establish connection
Produce and send the text
portion of the page
Establish connection
Transfer first image file
Establish connection
Transfer second image file
Establish connection
Transfer third image file
With persistent connections, the response time for the same request is reduced:
Activity
Establish connection
Produce and send the text
portion of the page
Transfer first image file
Transfer second image file
Transfer third image file
4-12 Oracle HTTP Server powered by Apache Performance Guide
Seconds
1
5
1
2
1
2
1
2
15
Total
Seconds
1
5
2
2
2
12
Total