Does xara use progressive jpeg when uploading to web server?

Also how to improve page requests ( Combine files to minimize the number of HTTP requests your site makes.)

Page requests 47 < 30 Combine files to minimize the number of HTTP requests your site makes.
Page requests 47 < 30 Combine files to minimize the number of HTTP requests your site makes.
Page requests 47 < 30 Combine files to minimize the number of HTTP requests your site makes.