This is entirely from running it from DVD. Consider: you are running an entire operating system, tightly compressed, from an optical disc. An optical disc. Entire operating system.
The system will be snappy once installed. With 1.5 GB RAM, you can make things even faster by going to Settings menu > Administration > Session and Startup and UNTICKING the following:
Then go to Settings menu > Look and Feel > Desktop Effects > Least
Then go to Settings menu > Look and Feel > UberStudent Logo Toggler > Disable