In my previous post Google+ Rolls Out Some Major Changes In Design Janmejaya form MyBloggerClub.com comment about the issue of slowness of +1 button. Now, after 24hrs there is a new announcement that the size of button has been reduced by 20%, that's really awesome since the button rendering time has decreased as you can see in my *under developing project * http://news.iteching.info/ (i'll talk later about project).
The new Button is currently in the Preview so there might be some problem to ensure the +1 button and Google+ badges function properly you can report any issues to the Google+ Developer Forum . This change applies to all supported browsers in all environments.
Most important you don't have to change any Button code as such in your side, it is an invisible change aimed at performance and stability of +1 Button.