Should change wordpress theme for a long time?

You know, when the wordpress get the  version 2.5, the contact surface had changed. Because of the net speed, every time I change my wordpress theme, have to wait for a long time, I don’t know why the wordpress team changed like this, still, i like the wordpress version 2.3.3.

Waiting, waiting, waiting…… for a long time…

When I upload some images, have to wait like this, and only one per time.

Yes, it’s beautiful but have to wait for a long time, really I want just one click to change my theme Immediately , upload more pictures more easy. I like blogger’s image uploading system