+1 button, has received two update today as on July 26, that will make the page loading it, faster, announced David Byttow, Software Engineer, Google Webmaster Centeral.
First, "we've begun to roll out out a set of changes that will make the button render up to 3x faster on your site. No action is required on your part, so just sit back, relax, and watch as the button loads more quickly than before," Byttow stated.
To generate the new async snippet, use +1 Configuration Tool (linked below). Below, you'll find an example of the code, which should be included below the last <g:plusone> tag on your page for best performance.
Here's the code new code:
You can generate the above code this +1 Configuration Tool. You can also read our guide on how to add +1 button on your sites: general websites / blogs, and read this guide for Blogger.com based blogs.
[Source: Webmaster Central blog]