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levo - 7:29 am on Jul 28, 2011 (gmt 0)
jquery is ~35kb compressed. I combine the jquery code and my custom loaders etc. in one .js file and load it asynchronously. It definitely makes difference, pages load first, and buttons etc. loaded in background later.
BTW, I also append button codes just before loading external scripts, so the page is valid (for non-js bots anyway)
var likecode='<fb:like href="http://www.facebook.com/" send="false" layout="button_count" width="90" show_faces="false" font="arial"></fb:like>';
var tweetcode='<a href="http://twitter.com/" class="twitter-follow-button" data-button="grey" data-text-color="#FFFFFF" data-link-color="#FFFFFF" data-width="225px">Follow @</a>';
var pluscode='<g:plusone size="medium"></g:plusone>';
$('#likediv').append(likecode);
$('#tweetdiv').append(tweetcode);
$('#plusdiv').append(pluscode);